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kitty/kitty/fonts.c
Kovid Goyal 03df0c3cca
Actually implement modify_font
2022-07-15 12:27:42 +05:30

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/*
* vim:fileencoding=utf-8
* fonts.c
* Copyright (C) 2017 Kovid Goyal <kovid at kovidgoyal.net>
*
* Distributed under terms of the GPL3 license.
*/
#include "fonts.h"
#include "state.h"
#include "emoji.h"
#include "unicode-data.h"
#include "charsets.h"
#include "glyph-cache.h"
#define MISSING_GLYPH (NUM_UNDERLINE_STYLES + 2)
#define MAX_NUM_EXTRA_GLYPHS_PUA 4u
typedef void (*send_sprite_to_gpu_func)(FONTS_DATA_HANDLE fg, unsigned int, unsigned int, unsigned int, pixel*);
send_sprite_to_gpu_func current_send_sprite_to_gpu = NULL;
static PyObject *python_send_to_gpu_impl = NULL;
extern PyTypeObject Line_Type;
enum {NO_FONT=-3, MISSING_FONT=-2, BLANK_FONT=-1, BOX_FONT=0};
typedef enum {
LIGATURE_UNKNOWN, INFINITE_LIGATURE_START, INFINITE_LIGATURE_MIDDLE, INFINITE_LIGATURE_END
} LigatureType;
#define SPECIAL_FILLED_MASK 1
#define SPECIAL_VALUE_MASK 2
#define EMPTY_FILLED_MASK 4
#define EMPTY_VALUE_MASK 8
typedef struct {
size_t max_y;
unsigned int x, y, z, xnum, ynum;
} GPUSpriteTracker;
static hb_buffer_t *harfbuzz_buffer = NULL;
static hb_feature_t hb_features[3] = {{0}};
static char_type shape_buffer[4096] = {0};
static size_t max_texture_size = 1024, max_array_len = 1024;
typedef enum { LIGA_FEATURE, DLIG_FEATURE, CALT_FEATURE } HBFeature;
static PyObject* font_feature_settings = NULL;
typedef struct {
char_type left, right;
size_t font_idx;
} SymbolMap;
static SymbolMap *symbol_maps = NULL, *narrow_symbols = NULL;
static size_t num_symbol_maps = 0, num_narrow_symbols = 0;
typedef enum { SPACER_STRATEGY_UNKNOWN, SPACERS_BEFORE, SPACERS_AFTER, SPACERS_IOSEVKA } SpacerStrategy;
typedef struct {
PyObject *face;
// Map glyphs to sprite map co-ords
SpritePosition *sprite_position_hash_table;
hb_feature_t* ffs_hb_features;
size_t num_ffs_hb_features;
GlyphProperties *glyph_properties_hash_table;
bool bold, italic, emoji_presentation;
SpacerStrategy spacer_strategy;
} Font;
typedef struct Canvas {
pixel *buf;
unsigned current_cells, alloced_cells;
} Canvas;
typedef struct {
FONTS_DATA_HEAD
id_type id;
unsigned int baseline, underline_position, underline_thickness, strikethrough_position, strikethrough_thickness;
size_t fonts_capacity, fonts_count, fallback_fonts_count;
ssize_t medium_font_idx, bold_font_idx, italic_font_idx, bi_font_idx, first_symbol_font_idx, first_fallback_font_idx;
Font *fonts;
Canvas canvas;
GPUSpriteTracker sprite_tracker;
} FontGroup;
static FontGroup* font_groups = NULL;
static size_t font_groups_capacity = 0;
static size_t num_font_groups = 0;
static id_type font_group_id_counter = 0;
static void initialize_font_group(FontGroup *fg);
static void
ensure_canvas_can_fit(FontGroup *fg, unsigned cells) {
if (fg->canvas.alloced_cells < cells) {
free(fg->canvas.buf);
fg->canvas.alloced_cells = cells + 4;
fg->canvas.buf = malloc(sizeof(fg->canvas.buf[0]) * 3u * fg->canvas.alloced_cells * fg->cell_width * fg->cell_height);
if (!fg->canvas.buf) fatal("Out of memory allocating canvas");
}
fg->canvas.current_cells = cells;
if (fg->canvas.buf) memset(fg->canvas.buf, 0, sizeof(fg->canvas.buf[0]) * fg->canvas.current_cells * 3u * fg->cell_width * fg->cell_height);
}
static void
save_window_font_groups(void) {
for (size_t o = 0; o < global_state.num_os_windows; o++) {
OSWindow *w = global_state.os_windows + o;
w->temp_font_group_id = w->fonts_data ? ((FontGroup*)(w->fonts_data))->id : 0;
}
}
static void
restore_window_font_groups(void) {
for (size_t o = 0; o < global_state.num_os_windows; o++) {
OSWindow *w = global_state.os_windows + o;
w->fonts_data = NULL;
for (size_t i = 0; i < num_font_groups; i++) {
if (font_groups[i].id == w->temp_font_group_id) {
w->fonts_data = (FONTS_DATA_HANDLE)(font_groups + i);
break;
}
}
}
}
static bool
font_group_is_unused(FontGroup *fg) {
for (size_t o = 0; o < global_state.num_os_windows; o++) {
OSWindow *w = global_state.os_windows + o;
if (w->temp_font_group_id == fg->id) return false;
}
return true;
}
void
free_maps(Font *font) {
free_sprite_position_hash_table(&font->sprite_position_hash_table);
font->sprite_position_hash_table = NULL;
free_glyph_properties_hash_table(&font->glyph_properties_hash_table);
font->glyph_properties_hash_table = NULL;
}
static void
del_font(Font *f) {
Py_CLEAR(f->face);
free(f->ffs_hb_features); f->ffs_hb_features = NULL;
free_maps(f);
f->bold = false; f->italic = false;
}
static void
del_font_group(FontGroup *fg) {
free(fg->canvas.buf); fg->canvas.buf = NULL; fg->canvas = (Canvas){0};
fg->sprite_map = free_sprite_map(fg->sprite_map);
for (size_t i = 0; i < fg->fonts_count; i++) del_font(fg->fonts + i);
free(fg->fonts); fg->fonts = NULL;
}
static void
trim_unused_font_groups(void) {
save_window_font_groups();
size_t i = 0;
while (i < num_font_groups) {
if (font_group_is_unused(font_groups + i)) {
del_font_group(font_groups + i);
size_t num_to_right = (--num_font_groups) - i;
if (!num_to_right) break;
memmove(font_groups + i, font_groups + 1 + i, num_to_right * sizeof(FontGroup));
} else i++;
}
restore_window_font_groups();
}
static void
add_font_group(void) {
if (num_font_groups) trim_unused_font_groups();
if (num_font_groups >= font_groups_capacity) {
save_window_font_groups();
font_groups_capacity += 5;
font_groups = realloc(font_groups, sizeof(FontGroup) * font_groups_capacity);
if (font_groups == NULL) fatal("Out of memory creating a new font group");
restore_window_font_groups();
}
num_font_groups++;
}
static FontGroup*
font_group_for(double font_sz_in_pts, double logical_dpi_x, double logical_dpi_y) {
for (size_t i = 0; i < num_font_groups; i++) {
FontGroup *fg = font_groups + i;
if (fg->font_sz_in_pts == font_sz_in_pts && fg->logical_dpi_x == logical_dpi_x && fg->logical_dpi_y == logical_dpi_y) return fg;
}
add_font_group();
FontGroup *fg = font_groups + num_font_groups - 1;
zero_at_ptr(fg);
fg->font_sz_in_pts = font_sz_in_pts;
fg->logical_dpi_x = logical_dpi_x;
fg->logical_dpi_y = logical_dpi_y;
fg->id = ++font_group_id_counter;
initialize_font_group(fg);
return fg;
}
// Sprites {{{
static void
sprite_map_set_error(int error) {
switch(error) {
case 1:
PyErr_NoMemory(); break;
case 2:
PyErr_SetString(PyExc_RuntimeError, "Out of texture space for sprites"); break;
default:
PyErr_SetString(PyExc_RuntimeError, "Unknown error occurred while allocating sprites"); break;
}
}
void
sprite_tracker_set_limits(size_t max_texture_size_, size_t max_array_len_) {
max_texture_size = max_texture_size_;
max_array_len = MIN(0xfffu, max_array_len_);
}
static void
do_increment(FontGroup *fg, int *error) {
fg->sprite_tracker.x++;
if (fg->sprite_tracker.x >= fg->sprite_tracker.xnum) {
fg->sprite_tracker.x = 0; fg->sprite_tracker.y++;
fg->sprite_tracker.ynum = MIN(MAX(fg->sprite_tracker.ynum, fg->sprite_tracker.y + 1), fg->sprite_tracker.max_y);
if (fg->sprite_tracker.y >= fg->sprite_tracker.max_y) {
fg->sprite_tracker.y = 0; fg->sprite_tracker.z++;
if (fg->sprite_tracker.z >= MIN((size_t)UINT16_MAX, max_array_len)) *error = 2;
}
}
}
static SpritePosition*
sprite_position_for(FontGroup *fg, Font *font, glyph_index *glyphs, unsigned glyph_count, uint8_t ligature_index, unsigned cell_count, int *error) {
bool created;
SpritePosition *s = find_or_create_sprite_position(&font->sprite_position_hash_table, glyphs, glyph_count, ligature_index, cell_count, &created);
if (!s) { *error = 1; return NULL; }
if (created) {
s->x = fg->sprite_tracker.x; s->y = fg->sprite_tracker.y; s->z = fg->sprite_tracker.z;
do_increment(fg, error);
}
return s;
}
void
sprite_tracker_current_layout(FONTS_DATA_HANDLE data, unsigned int *x, unsigned int *y, unsigned int *z) {
FontGroup *fg = (FontGroup*)data;
*x = fg->sprite_tracker.xnum; *y = fg->sprite_tracker.ynum; *z = fg->sprite_tracker.z;
}
static void
sprite_tracker_set_layout(GPUSpriteTracker *sprite_tracker, unsigned int cell_width, unsigned int cell_height) {
sprite_tracker->xnum = MIN(MAX(1u, max_texture_size / cell_width), (size_t)UINT16_MAX);
sprite_tracker->max_y = MIN(MAX(1u, max_texture_size / cell_height), (size_t)UINT16_MAX);
sprite_tracker->ynum = 1;
sprite_tracker->x = 0; sprite_tracker->y = 0; sprite_tracker->z = 0;
}
// }}}
static PyObject*
desc_to_face(PyObject *desc, FONTS_DATA_HANDLE fg) {
PyObject *d = specialize_font_descriptor(desc, fg);
if (d == NULL) return NULL;
PyObject *ans = face_from_descriptor(d, fg);
Py_DECREF(d);
return ans;
}
static bool
init_font(Font *f, PyObject *face, bool bold, bool italic, bool emoji_presentation) {
f->face = face; Py_INCREF(f->face);
f->bold = bold; f->italic = italic; f->emoji_presentation = emoji_presentation;
f->num_ffs_hb_features = 0;
const char *psname = postscript_name_for_face(face);
if (font_feature_settings != NULL){
PyObject* o = PyDict_GetItemString(font_feature_settings, psname);
if (o != NULL && PyTuple_Check(o)) {
Py_ssize_t len = PyTuple_GET_SIZE(o);
if (len > 0) {
f->num_ffs_hb_features = len + 1;
f->ffs_hb_features = calloc(f->num_ffs_hb_features, sizeof(hb_feature_t));
if (!f->ffs_hb_features) return false;
for (Py_ssize_t i = 0; i < len; i++) {
PyObject* parsed = PyObject_GetAttrString(PyTuple_GET_ITEM(o, i), "parsed");
if (parsed) {
memcpy(f->ffs_hb_features + i, PyBytes_AS_STRING(parsed), sizeof(hb_feature_t));
Py_DECREF(parsed);
}
}
memcpy(f->ffs_hb_features + len, &hb_features[CALT_FEATURE], sizeof(hb_feature_t));
}
}
}
if (!f->num_ffs_hb_features) {
f->ffs_hb_features = calloc(4, sizeof(hb_feature_t));
if (!f->ffs_hb_features) return false;
if (strstr(psname, "NimbusMonoPS-") == psname) {
memcpy(f->ffs_hb_features + f->num_ffs_hb_features++, &hb_features[LIGA_FEATURE], sizeof(hb_feature_t));
memcpy(f->ffs_hb_features + f->num_ffs_hb_features++, &hb_features[DLIG_FEATURE], sizeof(hb_feature_t));
}
memcpy(f->ffs_hb_features + f->num_ffs_hb_features++, &hb_features[CALT_FEATURE], sizeof(hb_feature_t));
}
return true;
}
static void
free_font_groups(void) {
if (font_groups) {
for (size_t i = 0; i < num_font_groups; i++) del_font_group(font_groups + i);
free(font_groups); font_groups = NULL;
font_groups_capacity = 0; num_font_groups = 0;
}
free_glyph_cache_global_resources();
}
static void
python_send_to_gpu(FONTS_DATA_HANDLE fg, unsigned int x, unsigned int y, unsigned int z, pixel* buf) {
if (python_send_to_gpu_impl) {
if (!num_font_groups) fatal("Cannot call send to gpu with no font groups");
PyObject *ret = PyObject_CallFunction(python_send_to_gpu_impl, "IIIN", x, y, z, PyBytes_FromStringAndSize((const char*)buf, sizeof(pixel) * fg->cell_width * fg->cell_height));
if (ret == NULL) PyErr_Print();
else Py_DECREF(ret);
}
}
static void
adjust_metric(unsigned int *metric, float adj, AdjustmentUnit unit, double dpi) {
if (adj == 0.f) return;
int a = 0;
switch (unit) {
case POINT:
a = ((long)round((adj * (dpi / 72.0)))); break;
case PERCENT:
*metric = (int)roundf((fabsf(adj) * (float)*metric) / 100.f); return;
case PIXEL:
a = (int)roundf(adj); break;
}
*metric = (a < 0 && -a > (int)*metric) ? 0 : *metric + a;
}
static void
calc_cell_metrics(FontGroup *fg) {
unsigned int cell_height, cell_width, baseline, underline_position, underline_thickness, strikethrough_position, strikethrough_thickness;
cell_metrics(fg->fonts[fg->medium_font_idx].face, &cell_width, &cell_height, &baseline, &underline_position, &underline_thickness, &strikethrough_position, &strikethrough_thickness);
if (!cell_width) fatal("Failed to calculate cell width for the specified font");
unsigned int before_cell_height = cell_height;
int cw = cell_width, ch = cell_height;
if (OPT(adjust_line_height_px) != 0) ch += OPT(adjust_line_height_px);
if (OPT(adjust_line_height_frac) != 0.f) ch = (int)(ch * OPT(adjust_line_height_frac));
if (OPT(adjust_column_width_px != 0)) cw += OPT(adjust_column_width_px);
if (OPT(adjust_column_width_frac) != 0.f) cw = (int)(cw * OPT(adjust_column_width_frac));
#define MAX_DIM 1000
#define MIN_WIDTH 2
#define MIN_HEIGHT 4
if (cw >= MIN_WIDTH && cw <= MAX_DIM) cell_width = cw;
else log_error("Cell width invalid after adjustment, ignoring adjust_column_width");
if (ch >= MIN_HEIGHT && ch <= MAX_DIM) cell_height = ch;
else log_error("Cell height invalid after adjustment, ignoring adjust_line_height");
int line_height_adjustment = cell_height - before_cell_height;
if (cell_height < MIN_HEIGHT) fatal("Line height too small: %u", cell_height);
if (cell_height > MAX_DIM) fatal("Line height too large: %u", cell_height);
if (cell_width < MIN_WIDTH) fatal("Cell width too small: %u", cell_width);
if (cell_width > MAX_DIM) fatal("Cell width too large: %u", cell_width);
#undef MIN_WIDTH
#undef MIN_HEIGHT
#undef MAX_DIM
#define A(which, dpi) adjust_metric(&which, OPT(which).val, OPT(which).unit, fg->logical_dpi_##dpi);
A(underline_thickness, y); A(underline_position, y); A(strikethrough_thickness, y); A(strikethrough_position, y);
#undef A
underline_position = MIN(cell_height - 1, underline_position);
// ensure there is at least a couple of pixels available to render styled underlines
while (underline_position > baseline + 1 && cell_height - underline_position < 2) underline_position--;
if (line_height_adjustment > 1) {
baseline += MIN(cell_height - 1, (unsigned)line_height_adjustment / 2);
underline_position += MIN(cell_height - 1, (unsigned)line_height_adjustment / 2);
}
sprite_tracker_set_layout(&fg->sprite_tracker, cell_width, cell_height);
fg->cell_width = cell_width; fg->cell_height = cell_height;
fg->baseline = baseline; fg->underline_position = underline_position; fg->underline_thickness = underline_thickness, fg->strikethrough_position = strikethrough_position, fg->strikethrough_thickness = strikethrough_thickness;
ensure_canvas_can_fit(fg, 8);
}
static bool
face_has_codepoint(PyObject* face, char_type cp) {
return glyph_id_for_codepoint(face, cp) > 0;
}
static bool
has_emoji_presentation(CPUCell *cpu_cell, GPUCell *gpu_cell) {
return gpu_cell->attrs.width == 2 && is_emoji(cpu_cell->ch) && cpu_cell->cc_idx[0] != VS15;
}
static bool
has_cell_text(Font *self, CPUCell *cell) {
if (!face_has_codepoint(self->face, cell->ch)) return false;
char_type combining_chars[arraysz(cell->cc_idx)];
unsigned num_cc = 0;
for (unsigned i = 0; i < arraysz(cell->cc_idx) && cell->cc_idx[i]; i++) {
const char_type ccp = codepoint_for_mark(cell->cc_idx[i]);
if (!is_non_rendered_char(ccp)) combining_chars[num_cc++] = ccp;
}
if (num_cc == 0) return true;
if (num_cc == 1) {
if (face_has_codepoint(self->face, combining_chars[0])) return true;
char_type ch = 0;
if (hb_unicode_compose(hb_unicode_funcs_get_default(), cell->ch, combining_chars[0], &ch) && face_has_codepoint(self->face, ch)) return true;
return false;
}
for (unsigned i = 0; i < num_cc; i++) {
if (!face_has_codepoint(self->face, combining_chars[i])) return false;
}
return true;
}
static void
output_cell_fallback_data(CPUCell *cell, bool bold, bool italic, bool emoji_presentation, PyObject *face, bool new_face) {
printf("U+%x ", cell->ch);
for (unsigned i = 0; i < arraysz(cell->cc_idx) && cell->cc_idx[i]; i++) {
printf("U+%x ", codepoint_for_mark(cell->cc_idx[i]));
}
if (bold) printf("bold ");
if (italic) printf("italic ");
if (emoji_presentation) printf("emoji_presentation ");
PyObject_Print(face, stdout, 0);
if (new_face) printf(" (new face)");
printf("\n");
}
static ssize_t
load_fallback_font(FontGroup *fg, CPUCell *cell, bool bold, bool italic, bool emoji_presentation) {
if (fg->fallback_fonts_count > 100) { log_error("Too many fallback fonts"); return MISSING_FONT; }
ssize_t f;
if (bold) f = italic ? fg->bi_font_idx : fg->bold_font_idx;
else f = italic ? fg->italic_font_idx : fg->medium_font_idx;
if (f < 0) f = fg->medium_font_idx;
PyObject *face = create_fallback_face(fg->fonts[f].face, cell, bold, italic, emoji_presentation, (FONTS_DATA_HANDLE)fg);
if (face == NULL) { PyErr_Print(); return MISSING_FONT; }
if (face == Py_None) { Py_DECREF(face); return MISSING_FONT; }
if (global_state.debug_font_fallback) output_cell_fallback_data(cell, bold, italic, emoji_presentation, face, true);
set_size_for_face(face, fg->cell_height, true, (FONTS_DATA_HANDLE)fg);
ensure_space_for(fg, fonts, Font, fg->fonts_count + 1, fonts_capacity, 5, true);
ssize_t ans = fg->first_fallback_font_idx + fg->fallback_fonts_count;
Font *af = &fg->fonts[ans];
if (!init_font(af, face, bold, italic, emoji_presentation)) fatal("Out of memory");
Py_DECREF(face);
if (!has_cell_text(af, cell)) {
if (global_state.debug_font_fallback) {
printf("The font chosen by the OS for the text: ");
printf("U+%x ", cell->ch);
for (unsigned i = 0; i < arraysz(cell->cc_idx) && cell->cc_idx[i]; i++) {
printf("U+%x ", codepoint_for_mark(cell->cc_idx[i]));
}
printf("is ");
PyObject_Print(af->face, stdout, 0);
printf(" but it does not actually contain glyphs for that text\n");
}
del_font(af);
return MISSING_FONT;
}
fg->fallback_fonts_count++;
fg->fonts_count++;
return ans;
}
static ssize_t
fallback_font(FontGroup *fg, CPUCell *cpu_cell, GPUCell *gpu_cell) {
bool bold = gpu_cell->attrs.bold;
bool italic = gpu_cell->attrs.italic;
bool emoji_presentation = has_emoji_presentation(cpu_cell, gpu_cell);
// Check if one of the existing fallback fonts has this text
for (size_t i = 0, j = fg->first_fallback_font_idx; i < fg->fallback_fonts_count; i++, j++) {
Font *ff = fg->fonts +j;
if (ff->bold == bold && ff->italic == italic && ff->emoji_presentation == emoji_presentation && has_cell_text(ff, cpu_cell)) {
if (global_state.debug_font_fallback) output_cell_fallback_data(cpu_cell, bold, italic, emoji_presentation, ff->face, false);
return j;
}
}
return load_fallback_font(fg, cpu_cell, bold, italic, emoji_presentation);
}
static ssize_t
in_symbol_maps(FontGroup *fg, char_type ch) {
for (size_t i = 0; i < num_symbol_maps; i++) {
if (symbol_maps[i].left <= ch && ch <= symbol_maps[i].right) return fg->first_symbol_font_idx + symbol_maps[i].font_idx;
}
return NO_FONT;
}
// Decides which 'font' to use for a given cell.
//
// Possible results:
// - NO_FONT
// - MISSING_FONT
// - BLANK_FONT
// - BOX_FONT
// - an index in the fonts list
static ssize_t
font_for_cell(FontGroup *fg, CPUCell *cpu_cell, GPUCell *gpu_cell, bool *is_main_font, bool *is_emoji_presentation) {
*is_main_font = false;
*is_emoji_presentation = false;
START_ALLOW_CASE_RANGE
ssize_t ans;
switch(cpu_cell->ch) {
case 0:
case ' ':
case '\t':
return BLANK_FONT;
case 0x2500 ... 0x2573:
case 0x2574 ... 0x259f:
case 0x2800 ... 0x28ff:
case 0xe0b0 ... 0xe0bf: // powerline box drawing
case 0x1fb00 ... 0x1fb8b: // symbols for legacy computing
case 0x1fba0 ... 0x1fbae:
return BOX_FONT;
default:
*is_emoji_presentation = has_emoji_presentation(cpu_cell, gpu_cell);
ans = in_symbol_maps(fg, cpu_cell->ch);
if (ans > -1) return ans;
switch(gpu_cell->attrs.bold | (gpu_cell->attrs.italic << 1)) {
case 0:
ans = fg->medium_font_idx; break;
case 1:
ans = fg->bold_font_idx ; break;
case 2:
ans = fg->italic_font_idx; break;
case 3:
ans = fg->bi_font_idx; break;
}
if (ans < 0) ans = fg->medium_font_idx;
if (!*is_emoji_presentation && has_cell_text(fg->fonts + ans, cpu_cell)) { *is_main_font = true; return ans; }
return fallback_font(fg, cpu_cell, gpu_cell);
}
END_ALLOW_CASE_RANGE
}
static void
set_sprite(GPUCell *cell, sprite_index x, sprite_index y, sprite_index z) {
cell->sprite_x = x; cell->sprite_y = y; cell->sprite_z = z;
}
// Gives a unique (arbitrary) id to a box glyph
static glyph_index
box_glyph_id(char_type ch) {
START_ALLOW_CASE_RANGE
switch(ch) {
case 0x2500 ... 0x259f:
return ch - 0x2500; // IDs from 0x00 to 0x9f
case 0xe0b0 ... 0xe0d4:
return 0xa0 + ch - 0xe0b0; // IDs from 0xa0 to 0xc4
case 0x1fb00 ... 0x1fb8b:
return 0xc5 + ch - 0x1fb00; // IDs from 0xc5 to 0x150
case 0x1fba0 ... 0x1fbae: // IDs from 0x151 to 0x15f
return 0x151 + ch - 0x1fba0;
case 0x2800 ... 0x28ff:
return 0x160 + ch - 0x2800;
default:
return 0xffff;
}
END_ALLOW_CASE_RANGE
}
static PyObject* box_drawing_function = NULL, *prerender_function = NULL, *descriptor_for_idx = NULL;
void
render_alpha_mask(const uint8_t *alpha_mask, pixel* dest, Region *src_rect, Region *dest_rect, size_t src_stride, size_t dest_stride) {
for (size_t sr = src_rect->top, dr = dest_rect->top; sr < src_rect->bottom && dr < dest_rect->bottom; sr++, dr++) {
pixel *d = dest + dest_stride * dr;
const uint8_t *s = alpha_mask + src_stride * sr;
for(size_t sc = src_rect->left, dc = dest_rect->left; sc < src_rect->right && dc < dest_rect->right; sc++, dc++) {
uint8_t src_alpha = d[dc] & 0xff;
uint8_t alpha = s[sc];
d[dc] = 0xffffff00 | MAX(alpha, src_alpha);
}
}
}
static void
render_box_cell(FontGroup *fg, CPUCell *cpu_cell, GPUCell *gpu_cell) {
int error = 0;
glyph_index glyph = box_glyph_id(cpu_cell->ch);
SpritePosition *sp = sprite_position_for(fg, &fg->fonts[BOX_FONT], &glyph, 1, 0, 1, &error);
if (sp == NULL) {
sprite_map_set_error(error); PyErr_Print();
set_sprite(gpu_cell, 0, 0, 0);
return;
}
set_sprite(gpu_cell, sp->x, sp->y, sp->z);
if (sp->rendered) return;
sp->rendered = true;
sp->colored = false;
PyObject *ret = PyObject_CallFunction(box_drawing_function, "IIId", cpu_cell->ch, fg->cell_width, fg->cell_height, (fg->logical_dpi_x + fg->logical_dpi_y) / 2.0);
if (ret == NULL) { PyErr_Print(); return; }
uint8_t *alpha_mask = PyLong_AsVoidPtr(PyTuple_GET_ITEM(ret, 0));
ensure_canvas_can_fit(fg, 1);
Region r = { .right = fg->cell_width, .bottom = fg->cell_height };
render_alpha_mask(alpha_mask, fg->canvas.buf, &r, &r, fg->cell_width, fg->cell_width);
current_send_sprite_to_gpu((FONTS_DATA_HANDLE)fg, sp->x, sp->y, sp->z, fg->canvas.buf);
Py_DECREF(ret);
}
static void
load_hb_buffer(CPUCell *first_cpu_cell, GPUCell *first_gpu_cell, index_type num_cells) {
index_type num;
hb_buffer_clear_contents(harfbuzz_buffer);
while (num_cells) {
uint16_t prev_width = 0;
for (num = 0; num_cells && num < arraysz(shape_buffer) - 20 - arraysz(first_cpu_cell->cc_idx); first_cpu_cell++, first_gpu_cell++, num_cells--) {
if (prev_width == 2) { prev_width = 0; continue; }
shape_buffer[num++] = first_cpu_cell->ch;
prev_width = first_gpu_cell->attrs.width;
for (unsigned i = 0; i < arraysz(first_cpu_cell->cc_idx) && first_cpu_cell->cc_idx[i]; i++) {
shape_buffer[num++] = codepoint_for_mark(first_cpu_cell->cc_idx[i]);
}
}
hb_buffer_add_utf32(harfbuzz_buffer, shape_buffer, num, 0, num);
}
hb_buffer_guess_segment_properties(harfbuzz_buffer);
if (OPT(force_ltr)) hb_buffer_set_direction(harfbuzz_buffer, HB_DIRECTION_LTR);
}
static void
set_cell_sprite(GPUCell *cell, const SpritePosition *sp) {
cell->sprite_x = sp->x; cell->sprite_y = sp->y; cell->sprite_z = sp->z;
if (sp->colored) cell->sprite_z |= 0x4000;
}
static pixel*
extract_cell_from_canvas(FontGroup *fg, unsigned int i, unsigned int num_cells) {
pixel *ans = fg->canvas.buf + (fg->cell_width * fg->cell_height * (fg->canvas.current_cells - 1)), *dest = ans, *src = fg->canvas.buf + (i * fg->cell_width);
unsigned int stride = fg->cell_width * num_cells;
for (unsigned int r = 0; r < fg->cell_height; r++, dest += fg->cell_width, src += stride) memcpy(dest, src, fg->cell_width * sizeof(fg->canvas.buf[0]));
return ans;
}
typedef struct GlyphRenderScratch {
SpritePosition* *sprite_positions;
glyph_index *glyphs;
size_t sz;
} GlyphRenderScratch;
static GlyphRenderScratch global_glyph_render_scratch = {0};
static void
render_group(FontGroup *fg, unsigned int num_cells, unsigned int num_glyphs, CPUCell *cpu_cells, GPUCell *gpu_cells, hb_glyph_info_t *info, hb_glyph_position_t *positions, Font *font, glyph_index *glyphs, unsigned glyph_count, bool center_glyph) {
#define sp global_glyph_render_scratch.sprite_positions
int error = 0;
bool all_rendered = true;
bool is_infinite_ligature = num_cells > 9 && num_glyphs == num_cells;
for (unsigned i = 0, ligature_index = 0; i < num_cells; i++) {
bool is_repeat_glyph = is_infinite_ligature && i > 1 && i + 1 < num_cells && glyphs[i] == glyphs[i-1] && glyphs[i] == glyphs[i-2] && glyphs[i] == glyphs[i+1];
if (is_repeat_glyph) {
sp[i] = sp[i-1];
} else {
sp[i] = sprite_position_for(fg, font, glyphs, glyph_count, ligature_index++, num_cells, &error);
}
if (error != 0) { sprite_map_set_error(error); PyErr_Print(); return; }
if (!sp[i]->rendered) all_rendered = false;
}
if (all_rendered) {
for (unsigned i = 0; i < num_cells; i++) { set_cell_sprite(gpu_cells + i, sp[i]); }
return;
}
ensure_canvas_can_fit(fg, num_cells + 1);
bool was_colored = gpu_cells->attrs.width == 2 && is_emoji(cpu_cells->ch);
render_glyphs_in_cells(font->face, font->bold, font->italic, info, positions, num_glyphs, fg->canvas.buf, fg->cell_width, fg->cell_height, num_cells, fg->baseline, &was_colored, (FONTS_DATA_HANDLE)fg, center_glyph);
if (PyErr_Occurred()) PyErr_Print();
for (unsigned i = 0; i < num_cells; i++) {
if (!sp[i]->rendered) {
sp[i]->rendered = true;
sp[i]->colored = was_colored;
pixel *buf = num_cells == 1 ? fg->canvas.buf : extract_cell_from_canvas(fg, i, num_cells);
current_send_sprite_to_gpu((FONTS_DATA_HANDLE)fg, sp[i]->x, sp[i]->y, sp[i]->z, buf);
}
set_cell_sprite(gpu_cells + i, sp[i]);
}
#undef sp
}
typedef struct {
CPUCell *cpu_cell;
GPUCell *gpu_cell;
unsigned int num_codepoints;
unsigned int codepoints_consumed;
char_type current_codepoint;
} CellData;
typedef struct {
unsigned int first_glyph_idx, first_cell_idx, num_glyphs, num_cells;
bool has_special_glyph, started_with_infinite_ligature;
} Group;
typedef struct {
uint32_t previous_cluster;
bool prev_was_special, prev_was_empty;
CellData current_cell_data;
Group *groups;
size_t groups_capacity, group_idx, glyph_idx, cell_idx, num_cells, num_glyphs;
CPUCell *first_cpu_cell, *last_cpu_cell;
GPUCell *first_gpu_cell, *last_gpu_cell;
hb_glyph_info_t *info;
hb_glyph_position_t *positions;
} GroupState;
static GroupState group_state = {0};
static unsigned int
num_codepoints_in_cell(CPUCell *cell) {
unsigned int ans = 1;
for (unsigned i = 0; i < arraysz(cell->cc_idx) && cell->cc_idx[i]; i++) ans++;
return ans;
}
static void
shape(CPUCell *first_cpu_cell, GPUCell *first_gpu_cell, index_type num_cells, hb_font_t *font, Font *fobj, bool disable_ligature) {
if (group_state.groups_capacity <= 2 * num_cells) {
group_state.groups_capacity = MAX(128u, 2 * num_cells); // avoid unnecessary reallocs
group_state.groups = realloc(group_state.groups, sizeof(Group) * group_state.groups_capacity);
if (!group_state.groups) fatal("Out of memory");
}
group_state.previous_cluster = UINT32_MAX;
group_state.prev_was_special = false;
group_state.prev_was_empty = false;
group_state.current_cell_data.cpu_cell = first_cpu_cell;
group_state.current_cell_data.gpu_cell = first_gpu_cell;
group_state.current_cell_data.num_codepoints = num_codepoints_in_cell(first_cpu_cell);
group_state.current_cell_data.codepoints_consumed = 0;
group_state.current_cell_data.current_codepoint = first_cpu_cell->ch;
zero_at_ptr_count(group_state.groups, group_state.groups_capacity);
group_state.group_idx = 0;
group_state.glyph_idx = 0;
group_state.cell_idx = 0;
group_state.num_cells = num_cells;
group_state.first_cpu_cell = first_cpu_cell;
group_state.first_gpu_cell = first_gpu_cell;
group_state.last_cpu_cell = first_cpu_cell + (num_cells ? num_cells - 1 : 0);
group_state.last_gpu_cell = first_gpu_cell + (num_cells ? num_cells - 1 : 0);
load_hb_buffer(first_cpu_cell, first_gpu_cell, num_cells);
size_t num_features = fobj->num_ffs_hb_features;
if (num_features && !disable_ligature) num_features--; // the last feature is always -calt
hb_shape(font, harfbuzz_buffer, fobj->ffs_hb_features, num_features);
unsigned int info_length, positions_length;
group_state.info = hb_buffer_get_glyph_infos(harfbuzz_buffer, &info_length);
group_state.positions = hb_buffer_get_glyph_positions(harfbuzz_buffer, &positions_length);
if (!group_state.info || !group_state.positions) group_state.num_glyphs = 0;
else group_state.num_glyphs = MIN(info_length, positions_length);
}
static bool
is_special_glyph(glyph_index glyph_id, Font *font, CellData* cell_data) {
// A glyph is special if the codepoint it corresponds to matches a
// different glyph in the font
GlyphProperties *s = find_or_create_glyph_properties(&font->glyph_properties_hash_table, glyph_id);
if (s == NULL) return false;
if (!(s->data & SPECIAL_FILLED_MASK)) {
bool is_special = cell_data->current_codepoint ? (
glyph_id != glyph_id_for_codepoint(font->face, cell_data->current_codepoint) ? true : false)
:
false;
uint8_t val = is_special ? SPECIAL_VALUE_MASK : 0;
s->data |= val | SPECIAL_FILLED_MASK;
}
return s->data & SPECIAL_VALUE_MASK;
}
static bool
is_empty_glyph(glyph_index glyph_id, Font *font) {
// A glyph is empty if its metrics have a width of zero
GlyphProperties *s = find_or_create_glyph_properties(&font->glyph_properties_hash_table, glyph_id);
if (s == NULL) return false;
if (!(s->data & EMPTY_FILLED_MASK)) {
uint8_t val = is_glyph_empty(font->face, glyph_id) ? EMPTY_VALUE_MASK : 0;
s->data |= val | EMPTY_FILLED_MASK;
}
return s->data & EMPTY_VALUE_MASK;
}
static unsigned int
check_cell_consumed(CellData *cell_data, CPUCell *last_cpu_cell) {
cell_data->codepoints_consumed++;
if (cell_data->codepoints_consumed >= cell_data->num_codepoints) {
uint16_t width = cell_data->gpu_cell->attrs.width;
cell_data->cpu_cell += MAX(1, width);
cell_data->gpu_cell += MAX(1, width);
cell_data->codepoints_consumed = 0;
if (cell_data->cpu_cell <= last_cpu_cell) {
cell_data->num_codepoints = num_codepoints_in_cell(cell_data->cpu_cell);
cell_data->current_codepoint = cell_data->cpu_cell->ch;
} else cell_data->current_codepoint = 0;
return width;
} else {
switch(cell_data->codepoints_consumed) {
case 0:
cell_data->current_codepoint = cell_data->cpu_cell->ch;
break;
default: {
index_type mark = cell_data->cpu_cell->cc_idx[cell_data->codepoints_consumed - 1];
// VS15/16 cause rendering to break, as they get marked as
// special glyphs, so map to 0, to avoid that
cell_data->current_codepoint = (mark == VS15 || mark == VS16) ? 0 : codepoint_for_mark(mark);
break;
}
}
}
return 0;
}
static LigatureType
ligature_type_from_glyph_name(const char *glyph_name, SpacerStrategy strategy) {
const char *p, *m, *s, *e;
if (strategy == SPACERS_IOSEVKA) {
p = strrchr(glyph_name, '.');
m = ".join-m"; s = ".join-l"; e = ".join-r";
} else {
p = strrchr(glyph_name, '_');
m = "_middle.seq"; s = "_start.seq"; e = "_end.seq";
}
if (p) {
if (strcmp(p, m) == 0) return INFINITE_LIGATURE_MIDDLE;
if (strcmp(p, s) == 0) return INFINITE_LIGATURE_START;
if (strcmp(p, e) == 0) return INFINITE_LIGATURE_END;
}
return LIGATURE_UNKNOWN;
}
#define G(x) (group_state.x)
static void
detect_spacer_strategy(hb_font_t *hbf, Font *font) {
CPUCell cpu_cells[3] = {{.ch = '='}, {.ch = '='}, {.ch = '='}};
const CellAttrs w1 = {.width=1};
GPUCell gpu_cells[3] = {{.attrs = w1}, {.attrs = w1}, {.attrs = w1}};
shape(cpu_cells, gpu_cells, arraysz(cpu_cells), hbf, font, false);
font->spacer_strategy = SPACERS_BEFORE;
if (G(num_glyphs) > 1) {
glyph_index glyph_id = G(info)[G(num_glyphs) - 1].codepoint;
bool is_special = is_special_glyph(glyph_id, font, &G(current_cell_data));
bool is_empty = is_special && is_empty_glyph(glyph_id, font);
if (is_empty) font->spacer_strategy = SPACERS_AFTER;
}
shape(cpu_cells, gpu_cells, 2, hbf, font, false);
if (G(num_glyphs)) {
char glyph_name[128]; glyph_name[arraysz(glyph_name)-1] = 0;
for (unsigned i = 0; i < G(num_glyphs); i++) {
glyph_index glyph_id = G(info)[i].codepoint;
hb_font_glyph_to_string(hbf, glyph_id, glyph_name, arraysz(glyph_name)-1);
char *dot = strrchr(glyph_name, '.');
if (dot && (!strcmp(dot, ".join-l") || !strcmp(dot, ".join-r") || !strcmp(dot, ".join-m"))) {
font->spacer_strategy = SPACERS_IOSEVKA;
break;
}
}
}
// If spacer_strategy is still default, check ### glyph to to confirm strategy
// https://github.com/kovidgoyal/kitty/issues/4721
if (font->spacer_strategy == SPACERS_BEFORE) {
cpu_cells[0].ch = '#'; cpu_cells[1].ch = '#'; cpu_cells[2].ch = '#';
shape(cpu_cells, gpu_cells, arraysz(cpu_cells), hbf, font, false);
if (G(num_glyphs) > 1) {
glyph_index glyph_id = G(info)[G(num_glyphs) - 1].codepoint;
bool is_special = is_special_glyph(glyph_id, font, &G(current_cell_data));
bool is_empty = is_special && is_empty_glyph(glyph_id, font);
if (is_empty) font->spacer_strategy = SPACERS_AFTER;
}
}
}
static LigatureType
ligature_type_for_glyph(hb_font_t *hbf, glyph_index glyph_id, SpacerStrategy strategy) {
static char glyph_name[128]; glyph_name[arraysz(glyph_name)-1] = 0;
hb_font_glyph_to_string(hbf, glyph_id, glyph_name, arraysz(glyph_name)-1);
return ligature_type_from_glyph_name(glyph_name, strategy);
}
#define L INFINITE_LIGATURE_START
#define M INFINITE_LIGATURE_MIDDLE
#define R INFINITE_LIGATURE_END
#define I LIGATURE_UNKNOWN
static bool
is_iosevka_lig_starter(LigatureType before, LigatureType current, LigatureType after) {
return (current == R || (current == I && (after == L || after == M))) \
&& \
!(before == R || before == M);
}
static bool
is_iosevka_lig_ender(LigatureType before, LigatureType current, LigatureType after) {
return (current == L || (current == I && (before == R || before == M))) \
&& \
!(after == L || after == M);
}
#undef L
#undef M
#undef R
#undef I
static LigatureType *ligature_types = NULL;
static size_t ligature_types_sz = 0;
static void
group_iosevka(Font *font, hb_font_t *hbf) {
// Group as per algorithm discussed in: https://github.com/be5invis/Iosevka/issues/1007
if (ligature_types_sz <= G(num_glyphs)) {
ligature_types_sz = G(num_glyphs) + 16;
ligature_types = realloc(ligature_types, ligature_types_sz * sizeof(ligature_types[0]));
if (!ligature_types) fatal("Out of memory allocating ligature types array");
}
for (size_t i = G(glyph_idx); i < G(num_glyphs); i++) {
ligature_types[i] = ligature_type_for_glyph(hbf, G(info)[i].codepoint, font->spacer_strategy);
}
uint32_t cluster, next_cluster;
while (G(glyph_idx) < G(num_glyphs) && G(cell_idx) < G(num_cells)) {
cluster = G(info)[G(glyph_idx)].cluster;
uint32_t num_codepoints_used_by_glyph = 0;
bool is_last_glyph = G(glyph_idx) == G(num_glyphs) - 1;
Group *current_group = G(groups) + G(group_idx);
if (is_last_glyph) {
num_codepoints_used_by_glyph = UINT32_MAX;
next_cluster = 0;
} else {
next_cluster = G(info)[G(glyph_idx) + 1].cluster;
// RTL languages like Arabic have decreasing cluster numbers
if (next_cluster != cluster) num_codepoints_used_by_glyph = cluster > next_cluster ? cluster - next_cluster : next_cluster - cluster;
}
const LigatureType before = G(glyph_idx) ? ligature_types[G(glyph_idx - 1)] : LIGATURE_UNKNOWN;
const LigatureType current = ligature_types[G(glyph_idx)];
const LigatureType after = is_last_glyph ? LIGATURE_UNKNOWN : ligature_types[G(glyph_idx + 1)];
bool end_current_group = false;
if (current_group->num_glyphs) {
if (is_iosevka_lig_ender(before, current, after)) end_current_group = true;
else {
if (!current_group->num_cells && !current_group->has_special_glyph) {
if (is_iosevka_lig_starter(before, current, after)) current_group->has_special_glyph = true;
else end_current_group = true;
}
}
}
if (!current_group->num_glyphs++) {
if (is_iosevka_lig_starter(before, current, after)) current_group->has_special_glyph = true;
else end_current_group = true;
current_group->first_glyph_idx = G(glyph_idx);
current_group->first_cell_idx = G(cell_idx);
}
if (is_last_glyph) {
// soak up all remaining cells
if (G(cell_idx) < G(num_cells)) {
unsigned int num_left = G(num_cells) - G(cell_idx);
current_group->num_cells += num_left;
G(cell_idx) += num_left;
}
} else {
unsigned int num_cells_consumed = 0;
while (num_codepoints_used_by_glyph && G(cell_idx) < G(num_cells)) {
unsigned int w = check_cell_consumed(&G(current_cell_data), G(last_cpu_cell));
G(cell_idx) += w;
num_cells_consumed += w;
num_codepoints_used_by_glyph--;
}
current_group->num_cells += num_cells_consumed;
}
if (end_current_group && current_group->num_cells) G(group_idx)++;
G(glyph_idx)++;
}
}
static void
group_normal(Font *font, hb_font_t *hbf) {
/* Now distribute the glyphs into groups of cells
* Considerations to keep in mind:
* Group sizes should be as small as possible for best performance
* Combining chars can result in multiple glyphs rendered into a single cell
* Emoji and East Asian wide chars can cause a single glyph to be rendered over multiple cells
* Ligature fonts, take two common approaches:
* 1. ABC becomes EMPTY, EMPTY, WIDE GLYPH this means we have to render N glyphs in N cells (example Fira Code)
* 2. ABC becomes WIDE GLYPH this means we have to render one glyph in N cells (example Operator Mono Lig)
* 3. ABC becomes WIDE GLYPH, EMPTY, EMPTY this means we have to render N glyphs in N cells (example Cascadia Code)
* 4. Variable length ligatures are identified by a glyph naming convention of _start.seq, _middle.seq and _end.seq
* with EMPTY glyphs in the middle or after (both Fira Code and Cascadia Code)
*
* We rely on the cluster numbers from harfbuzz to tell us how many unicode codepoints a glyph corresponds to.
* Then we check if the glyph is a ligature glyph (is_special_glyph) and if it is an empty glyph.
* We detect if the font uses EMPTY glyphs before or after ligature glyphs (1. or 3. above) by checking what it does for === and ###.
* Finally we look at the glyph name. These five datapoints give us enough information to satisfy the constraint above,
* for a wide variety of fonts.
*/
uint32_t cluster, next_cluster;
bool add_to_current_group;
bool prev_glyph_was_inifinte_ligature_end = false;
while (G(glyph_idx) < G(num_glyphs) && G(cell_idx) < G(num_cells)) {
glyph_index glyph_id = G(info)[G(glyph_idx)].codepoint;
LigatureType ligature_type = ligature_type_for_glyph(hbf, glyph_id, font->spacer_strategy);
cluster = G(info)[G(glyph_idx)].cluster;
bool is_special = is_special_glyph(glyph_id, font, &G(current_cell_data));
bool is_empty = is_special && is_empty_glyph(glyph_id, font);
uint32_t num_codepoints_used_by_glyph = 0;
bool is_last_glyph = G(glyph_idx) == G(num_glyphs) - 1;
Group *current_group = G(groups) + G(group_idx);
if (is_last_glyph) {
num_codepoints_used_by_glyph = UINT32_MAX;
next_cluster = 0;
} else {
next_cluster = G(info)[G(glyph_idx) + 1].cluster;
// RTL languages like Arabic have decreasing cluster numbers
if (next_cluster != cluster) num_codepoints_used_by_glyph = cluster > next_cluster ? cluster - next_cluster : next_cluster - cluster;
}
if (!current_group->num_glyphs) {
add_to_current_group = true;
} else if (current_group->started_with_infinite_ligature) {
if (prev_glyph_was_inifinte_ligature_end) add_to_current_group = is_empty && font->spacer_strategy == SPACERS_AFTER;
else add_to_current_group = ligature_type == INFINITE_LIGATURE_MIDDLE || ligature_type == INFINITE_LIGATURE_END || is_empty;
} else {
if (is_special) {
if (!current_group->num_cells) add_to_current_group = true;
else if (font->spacer_strategy == SPACERS_BEFORE) add_to_current_group = G(prev_was_empty);
else add_to_current_group = is_empty;
} else {
add_to_current_group = !G(prev_was_special) || !current_group->num_cells;
}
}
#if 0
char ch[8] = {0};
encode_utf8(G(current_cell_data).current_codepoint, ch);
printf("\x1b[32m→ %s\x1b[m glyph_idx: %zu glyph_id: %u group_idx: %zu cluster: %u -> %u is_special: %d\n"
" num_codepoints_used_by_glyph: %u current_group: (%u cells, %u glyphs) add_to_current_group: %d\n",
ch, G(glyph_idx), glyph_id, G(group_idx), cluster, next_cluster, is_special,
num_codepoints_used_by_glyph, current_group->num_cells, current_group->num_glyphs, add_to_current_group);
#endif
if (!add_to_current_group) { current_group = G(groups) + ++G(group_idx); }
if (!current_group->num_glyphs++) {
if (ligature_type == INFINITE_LIGATURE_START || ligature_type == INFINITE_LIGATURE_MIDDLE) current_group->started_with_infinite_ligature = true;
current_group->first_glyph_idx = G(glyph_idx);
current_group->first_cell_idx = G(cell_idx);
}
#define MOVE_GLYPH_TO_NEXT_GROUP(start_cell_idx) { \
current_group->num_glyphs--; \
G(group_idx)++; current_group = G(groups) + G(group_idx); \
current_group->first_cell_idx = start_cell_idx; \
current_group->num_glyphs = 1; \
current_group->first_glyph_idx = G(glyph_idx); \
}
if (is_special) current_group->has_special_glyph = true;
if (is_last_glyph) {
// soak up all remaining cells
if (G(cell_idx) < G(num_cells)) {
unsigned int num_left = G(num_cells) - G(cell_idx);
current_group->num_cells += num_left;
G(cell_idx) += num_left;
}
} else {
unsigned int num_cells_consumed = 0;
while (num_codepoints_used_by_glyph && G(cell_idx) < G(num_cells)) {
unsigned int w = check_cell_consumed(&G(current_cell_data), G(last_cpu_cell));
G(cell_idx) += w;
num_cells_consumed += w;
num_codepoints_used_by_glyph--;
}
if (num_cells_consumed) {
current_group->num_cells += num_cells_consumed;
if (!is_special) { // not a ligature, end the group
G(group_idx)++; current_group = G(groups) + G(group_idx);
}
}
}
G(prev_was_special) = is_special;
G(prev_was_empty) = is_empty;
G(previous_cluster) = cluster;
prev_glyph_was_inifinte_ligature_end = ligature_type == INFINITE_LIGATURE_END;
G(glyph_idx)++;
}
}
static void
shape_run(CPUCell *first_cpu_cell, GPUCell *first_gpu_cell, index_type num_cells, Font *font, bool disable_ligature) {
hb_font_t *hbf = harfbuzz_font_for_face(font->face);
if (font->spacer_strategy == SPACER_STRATEGY_UNKNOWN) detect_spacer_strategy(hbf, font);
shape(first_cpu_cell, first_gpu_cell, num_cells, hbf, font, disable_ligature);
if (font->spacer_strategy == SPACERS_IOSEVKA) group_iosevka(font, hbf);
else group_normal(font, hbf);
#if 0
static char dbuf[1024];
// You can also generate this easily using hb-shape --show-extents --cluster-level=1 --shapers=ot /path/to/font/file text
hb_buffer_serialize_glyphs(harfbuzz_buffer, 0, group_state.num_glyphs, dbuf, sizeof(dbuf), NULL, harfbuzz_font_for_face(font->face), HB_BUFFER_SERIALIZE_FORMAT_TEXT, HB_BUFFER_SERIALIZE_FLAG_DEFAULT | HB_BUFFER_SERIALIZE_FLAG_GLYPH_EXTENTS);
printf("\n%s\n", dbuf);
#endif
}
static void
collapse_pua_space_ligature(index_type num_cells) {
Group *g = G(groups);
G(group_idx) = 0;
g->num_cells = num_cells;
// We dont want to render the spaces in a space ligature because
// there exist stupid fonts like Powerline that have no space glyph,
// so special case it: https://github.com/kovidgoyal/kitty/issues/1225
g->num_glyphs = 1;
}
#undef MOVE_GLYPH_TO_NEXT_GROUP
static bool
is_group_calt_ligature(const Group *group) {
GPUCell *first_cell = G(first_gpu_cell) + group->first_cell_idx;
return group->num_cells > 1 && group->has_special_glyph && first_cell->attrs.width == 1;
}
static void
split_run_at_offset(index_type cursor_offset, index_type *left, index_type *right) {
*left = 0; *right = 0;
for (unsigned idx = 0; idx < G(group_idx) + 1; idx++) {
Group *group = G(groups) + idx;
if (group->first_cell_idx <= cursor_offset && cursor_offset < group->first_cell_idx + group->num_cells) {
if (is_group_calt_ligature(group)) {
// likely a calt ligature
*left = group->first_cell_idx; *right = group->first_cell_idx + group->num_cells;
}
break;
}
}
}
static void
render_groups(FontGroup *fg, Font *font, bool center_glyph) {
unsigned idx = 0;
while (idx <= G(group_idx)) {
Group *group = G(groups) + idx;
if (!group->num_cells) break;
/* printf("Group: idx: %u num_cells: %u num_glyphs: %u first_glyph_idx: %u first_cell_idx: %u total_num_glyphs: %zu\n", */
/* idx, group->num_cells, group->num_glyphs, group->first_glyph_idx, group->first_cell_idx, group_state.num_glyphs); */
if (group->num_glyphs) {
size_t sz = MAX(group->num_glyphs, group->num_cells) + 16;
if (global_glyph_render_scratch.sz < sz) {
#define a(what) free(global_glyph_render_scratch.what); global_glyph_render_scratch.what = malloc(sz * sizeof(global_glyph_render_scratch.what[0])); if (!global_glyph_render_scratch.what) fatal("Out of memory");
a(glyphs); a(sprite_positions);
#undef a
global_glyph_render_scratch.sz = sz;
}
for (unsigned i = 0; i < group->num_glyphs; i++) global_glyph_render_scratch.glyphs[i] = G(info)[group->first_glyph_idx + i].codepoint;
render_group(fg, group->num_cells, group->num_glyphs, G(first_cpu_cell) + group->first_cell_idx, G(first_gpu_cell) + group->first_cell_idx, G(info) + group->first_glyph_idx, G(positions) + group->first_glyph_idx, font, global_glyph_render_scratch.glyphs, group->num_glyphs, center_glyph);
}
idx++;
}
}
static PyObject*
test_shape(PyObject UNUSED *self, PyObject *args) {
Line *line;
char *path = NULL;
int index = 0;
if(!PyArg_ParseTuple(args, "O!|zi", &Line_Type, &line, &path, &index)) return NULL;
index_type num = 0;
while(num < line->xnum && line->cpu_cells[num].ch) num += line->gpu_cells[num].attrs.width;
PyObject *face = NULL;
Font *font;
if (!num_font_groups) { PyErr_SetString(PyExc_RuntimeError, "must create at least one font group first"); return NULL; }
if (path) {
face = face_from_path(path, index, (FONTS_DATA_HANDLE)font_groups);
if (face == NULL) return NULL;
font = calloc(1, sizeof(Font));
font->face = face;
} else {
FontGroup *fg = font_groups;
font = fg->fonts + fg->medium_font_idx;
}
shape_run(line->cpu_cells, line->gpu_cells, num, font, false);
PyObject *ans = PyList_New(0);
unsigned int idx = 0;
glyph_index first_glyph;
while (idx <= G(group_idx)) {
Group *group = G(groups) + idx;
if (!group->num_cells) break;
first_glyph = group->num_glyphs ? G(info)[group->first_glyph_idx].codepoint : 0;
PyObject *eg = PyTuple_New(group->num_glyphs);
for (size_t g = 0; g < group->num_glyphs; g++) PyTuple_SET_ITEM(eg, g, Py_BuildValue("H", G(info)[group->first_glyph_idx + g].codepoint));
PyList_Append(ans, Py_BuildValue("IIHN", group->num_cells, group->num_glyphs, first_glyph, eg));
idx++;
}
if (face) { Py_CLEAR(face); free_maps(font); free(font); }
return ans;
}
#undef G
static void
render_run(FontGroup *fg, CPUCell *first_cpu_cell, GPUCell *first_gpu_cell, index_type num_cells, ssize_t font_idx, bool pua_space_ligature, bool center_glyph, int cursor_offset, DisableLigature disable_ligature_strategy) {
switch(font_idx) {
default:
shape_run(first_cpu_cell, first_gpu_cell, num_cells, &fg->fonts[font_idx], disable_ligature_strategy == DISABLE_LIGATURES_ALWAYS);
if (pua_space_ligature) collapse_pua_space_ligature(num_cells);
else if (cursor_offset > -1) { // false if DISABLE_LIGATURES_NEVER
index_type left, right;
split_run_at_offset(cursor_offset, &left, &right);
if (right > left) {
if (left) {
shape_run(first_cpu_cell, first_gpu_cell, left, &fg->fonts[font_idx], false);
render_groups(fg, &fg->fonts[font_idx], center_glyph);
}
shape_run(first_cpu_cell + left, first_gpu_cell + left, right - left, &fg->fonts[font_idx], true);
render_groups(fg, &fg->fonts[font_idx], center_glyph);
if (right < num_cells) {
shape_run(first_cpu_cell + right, first_gpu_cell + right, num_cells - right, &fg->fonts[font_idx], false);
render_groups(fg, &fg->fonts[font_idx], center_glyph);
}
break;
}
}
render_groups(fg, &fg->fonts[font_idx], center_glyph);
break;
case BLANK_FONT:
while(num_cells--) { set_sprite(first_gpu_cell, 0, 0, 0); first_cpu_cell++; first_gpu_cell++; }
break;
case BOX_FONT:
while(num_cells--) { render_box_cell(fg, first_cpu_cell, first_gpu_cell); first_cpu_cell++; first_gpu_cell++; }
break;
case MISSING_FONT:
while(num_cells--) { set_sprite(first_gpu_cell, MISSING_GLYPH, 0, 0); first_cpu_cell++; first_gpu_cell++; }
break;
}
}
static bool
is_non_emoji_dingbat(char_type ch) {
switch(ch) {
START_ALLOW_CASE_RANGE
case 0x2700 ... 0x27bf:
case 0x1f100 ... 0x1f1ff:
return !is_emoji(ch);
END_ALLOW_CASE_RANGE
}
return false;
}
static unsigned int
cell_cap_for_codepoint(const char_type cp) {
unsigned int ans = UINT_MAX;
for (size_t i = 0; i < num_narrow_symbols; i++) {
SymbolMap *sm = narrow_symbols + i;
if (sm->left <= cp && cp <= sm->right) ans = sm->font_idx;
}
return ans;
}
void
render_line(FONTS_DATA_HANDLE fg_, Line *line, index_type lnum, Cursor *cursor, DisableLigature disable_ligature_strategy) {
#define RENDER if (run_font_idx != NO_FONT && i > first_cell_in_run) { \
int cursor_offset = -1; \
if (disable_ligature_at_cursor && first_cell_in_run <= cursor->x && cursor->x <= i) cursor_offset = cursor->x - first_cell_in_run; \
render_run(fg, line->cpu_cells + first_cell_in_run, line->gpu_cells + first_cell_in_run, i - first_cell_in_run, run_font_idx, false, center_glyph, cursor_offset, disable_ligature_strategy); \
}
FontGroup *fg = (FontGroup*)fg_;
ssize_t run_font_idx = NO_FONT;
bool center_glyph = false;
bool disable_ligature_at_cursor = cursor != NULL && disable_ligature_strategy == DISABLE_LIGATURES_CURSOR && lnum == cursor->y;
index_type first_cell_in_run, i;
uint16_t prev_width = 0;
for (i=0, first_cell_in_run=0; i < line->xnum; i++) {
if (prev_width == 2) { prev_width = 0; continue; }
CPUCell *cpu_cell = line->cpu_cells + i;
GPUCell *gpu_cell = line->gpu_cells + i;
bool is_main_font, is_emoji_presentation;
ssize_t cell_font_idx = font_for_cell(fg, cpu_cell, gpu_cell, &is_main_font, &is_emoji_presentation);
if (
cell_font_idx != MISSING_FONT &&
((!is_main_font && !is_emoji_presentation && is_symbol(cpu_cell->ch)) || (cell_font_idx != BOX_FONT && (is_private_use(cpu_cell->ch))) || is_non_emoji_dingbat(cpu_cell->ch))
) {
unsigned int desired_cells = 1;
if (cell_font_idx > 0) {
Font *font = (fg->fonts + cell_font_idx);
glyph_index glyph_id = glyph_id_for_codepoint(font->face, cpu_cell->ch);
int width = get_glyph_width(font->face, glyph_id);
desired_cells = (unsigned int)ceilf((float)width / fg->cell_width);
}
desired_cells = MIN(desired_cells, cell_cap_for_codepoint(cpu_cell->ch));
unsigned int num_spaces = 0;
while (
i + num_spaces + 1 < line->xnum
&& line->cpu_cells[i+num_spaces+1].ch == ' '
&& num_spaces < MAX_NUM_EXTRA_GLYPHS_PUA
&& num_spaces + 1 < desired_cells
) {
num_spaces++;
// We have a private use char followed by space(s), render it as a multi-cell ligature.
GPUCell *space_cell = line->gpu_cells + i + num_spaces;
// Ensure the space cell uses the foreground color from the PUA cell.
// This is needed because there are applications like
// Powerline that use PUA+space with different foreground colors
// for the space and the PUA. See for example: https://github.com/kovidgoyal/kitty/issues/467
space_cell->fg = gpu_cell->fg;
space_cell->decoration_fg = gpu_cell->decoration_fg;
}
if (num_spaces) {
center_glyph = true;
RENDER
center_glyph = false;
render_run(fg, line->cpu_cells + i, line->gpu_cells + i, num_spaces + 1, cell_font_idx, true, center_glyph, -1, disable_ligature_strategy);
run_font_idx = NO_FONT;
first_cell_in_run = i + num_spaces + 1;
prev_width = line->gpu_cells[i+num_spaces].attrs.width;
i += num_spaces;
continue;
}
}
prev_width = gpu_cell->attrs.width;
if (run_font_idx == NO_FONT) run_font_idx = cell_font_idx;
if (run_font_idx == cell_font_idx) continue;
RENDER
run_font_idx = cell_font_idx;
first_cell_in_run = i;
}
RENDER
#undef RENDER
}
StringCanvas
render_simple_text(FONTS_DATA_HANDLE fg_, const char *text) {
FontGroup *fg = (FontGroup*)fg_;
if (fg->fonts_count && fg->medium_font_idx) return render_simple_text_impl(fg->fonts[fg->medium_font_idx].face, text, fg->baseline);
StringCanvas ans = {0};
return ans;
}
static void
clear_symbol_maps(void) {
if (symbol_maps) { free(symbol_maps); symbol_maps = NULL; num_symbol_maps = 0; }
if (narrow_symbols) { free(narrow_symbols); narrow_symbols = NULL; num_narrow_symbols = 0; }
}
typedef struct {
unsigned int main, bold, italic, bi, num_symbol_fonts;
} DescriptorIndices;
DescriptorIndices descriptor_indices = {0};
static bool
set_symbol_maps(SymbolMap **maps, size_t *num, const PyObject *sm) {
*num = PyTuple_GET_SIZE(sm);
*maps = calloc(*num, sizeof(SymbolMap));
if (*maps == NULL) { PyErr_NoMemory(); return false; }
for (size_t s = 0; s < *num; s++) {
unsigned int left, right, font_idx;
SymbolMap *x = *maps + s;
if (!PyArg_ParseTuple(PyTuple_GET_ITEM(sm, s), "III", &left, &right, &font_idx)) return NULL;
x->left = left; x->right = right; x->font_idx = font_idx;
}
return true;
}
static PyObject*
set_font_data(PyObject UNUSED *m, PyObject *args) {
PyObject *sm, *ns;
Py_CLEAR(box_drawing_function); Py_CLEAR(prerender_function); Py_CLEAR(descriptor_for_idx); Py_CLEAR(font_feature_settings);
if (!PyArg_ParseTuple(args, "OOOIIIIO!dOO!",
&box_drawing_function, &prerender_function, &descriptor_for_idx,
&descriptor_indices.bold, &descriptor_indices.italic, &descriptor_indices.bi, &descriptor_indices.num_symbol_fonts,
&PyTuple_Type, &sm, &OPT(font_size), &font_feature_settings, &PyTuple_Type, &ns)) return NULL;
Py_INCREF(box_drawing_function); Py_INCREF(prerender_function); Py_INCREF(descriptor_for_idx); Py_INCREF(font_feature_settings);
free_font_groups();
clear_symbol_maps();
set_symbol_maps(&symbol_maps, &num_symbol_maps, sm);
set_symbol_maps(&narrow_symbols, &num_narrow_symbols, ns);
Py_RETURN_NONE;
}
static void
send_prerendered_sprites(FontGroup *fg) {
int error = 0;
sprite_index x = 0, y = 0, z = 0;
// blank cell
ensure_canvas_can_fit(fg, 1);
current_send_sprite_to_gpu((FONTS_DATA_HANDLE)fg, x, y, z, fg->canvas.buf);
do_increment(fg, &error);
if (error != 0) { sprite_map_set_error(error); PyErr_Print(); fatal("Failed"); }
PyObject *args = PyObject_CallFunction(prerender_function, "IIIIIIIffdd", fg->cell_width, fg->cell_height, fg->baseline, fg->underline_position, fg->underline_thickness, fg->strikethrough_position, fg->strikethrough_thickness, OPT(cursor_beam_thickness), OPT(cursor_underline_thickness), fg->logical_dpi_x, fg->logical_dpi_y);
if (args == NULL) { PyErr_Print(); fatal("Failed to pre-render cells"); }
PyObject *cell_addresses = PyTuple_GET_ITEM(args, 0);
for (ssize_t i = 0; i < PyTuple_GET_SIZE(cell_addresses); i++) {
x = fg->sprite_tracker.x; y = fg->sprite_tracker.y; z = fg->sprite_tracker.z;
if (y > 0) { fatal("Too many pre-rendered sprites for your GPU or the font size is too large"); }
do_increment(fg, &error);
if (error != 0) { sprite_map_set_error(error); PyErr_Print(); fatal("Failed"); }
uint8_t *alpha_mask = PyLong_AsVoidPtr(PyTuple_GET_ITEM(cell_addresses, i));
ensure_canvas_can_fit(fg, 1); // clear canvas
Region r = { .right = fg->cell_width, .bottom = fg->cell_height };
render_alpha_mask(alpha_mask, fg->canvas.buf, &r, &r, fg->cell_width, fg->cell_width);
current_send_sprite_to_gpu((FONTS_DATA_HANDLE)fg, x, y, z, fg->canvas.buf);
}
Py_CLEAR(args);
}
static size_t
initialize_font(FontGroup *fg, unsigned int desc_idx, const char *ftype) {
PyObject *d = PyObject_CallFunction(descriptor_for_idx, "I", desc_idx);
if (d == NULL) { PyErr_Print(); fatal("Failed for %s font", ftype); }
bool bold = PyObject_IsTrue(PyTuple_GET_ITEM(d, 1));
bool italic = PyObject_IsTrue(PyTuple_GET_ITEM(d, 2));
PyObject *face = desc_to_face(PyTuple_GET_ITEM(d, 0), (FONTS_DATA_HANDLE)fg);
Py_CLEAR(d);
if (face == NULL) { PyErr_Print(); fatal("Failed to convert descriptor to face for %s font", ftype); }
size_t idx = fg->fonts_count++;
bool ok = init_font(fg->fonts + idx, face, bold, italic, false);
Py_CLEAR(face);
if (!ok) {
if (PyErr_Occurred()) { PyErr_Print(); }
fatal("Failed to initialize %s font: %zu", ftype, idx);
}
return idx;
}
static void
initialize_font_group(FontGroup *fg) {
fg->fonts_capacity = 10 + descriptor_indices.num_symbol_fonts;
fg->fonts = calloc(fg->fonts_capacity, sizeof(Font));
if (fg->fonts == NULL) fatal("Out of memory allocating fonts array");
fg->fonts_count = 1; // the 0 index font is the box font
#define I(attr) if (descriptor_indices.attr) fg->attr##_font_idx = initialize_font(fg, descriptor_indices.attr, #attr); else fg->attr##_font_idx = -1;
fg->medium_font_idx = initialize_font(fg, 0, "medium");
I(bold); I(italic); I(bi);
#undef I
fg->first_symbol_font_idx = fg->fonts_count; fg->first_fallback_font_idx = fg->fonts_count;
fg->fallback_fonts_count = 0;
for (size_t i = 0; i < descriptor_indices.num_symbol_fonts; i++) {
initialize_font(fg, descriptor_indices.bi + 1 + i, "symbol_map");
fg->first_fallback_font_idx++;
}
#undef I
calc_cell_metrics(fg);
// rescale the symbol_map faces for the desired cell height, this is how fallback fonts are sized as well
for (size_t i = 0; i < descriptor_indices.num_symbol_fonts; i++) {
Font *font = fg->fonts + i + fg->first_symbol_font_idx;
set_size_for_face(font->face, fg->cell_height, true, (FONTS_DATA_HANDLE)fg);
}
}
void
send_prerendered_sprites_for_window(OSWindow *w) {
FontGroup *fg = (FontGroup*)w->fonts_data;
if (!fg->sprite_map) {
fg->sprite_map = alloc_sprite_map(fg->cell_width, fg->cell_height);
send_prerendered_sprites(fg);
}
}
FONTS_DATA_HANDLE
load_fonts_data(double font_sz_in_pts, double dpi_x, double dpi_y) {
FontGroup *fg = font_group_for(font_sz_in_pts, dpi_x, dpi_y);
return (FONTS_DATA_HANDLE)fg;
}
static void
finalize(void) {
Py_CLEAR(python_send_to_gpu_impl);
clear_symbol_maps();
Py_CLEAR(box_drawing_function);
Py_CLEAR(prerender_function);
Py_CLEAR(descriptor_for_idx);
Py_CLEAR(font_feature_settings);
free_font_groups();
free(ligature_types);
if (harfbuzz_buffer) { hb_buffer_destroy(harfbuzz_buffer); harfbuzz_buffer = NULL; }
free(group_state.groups); group_state.groups = NULL; group_state.groups_capacity = 0;
free(global_glyph_render_scratch.glyphs);
free(global_glyph_render_scratch.sprite_positions);
global_glyph_render_scratch = (GlyphRenderScratch){0};
}
static PyObject*
sprite_map_set_layout(PyObject UNUSED *self, PyObject *args) {
unsigned int w, h;
if(!PyArg_ParseTuple(args, "II", &w, &h)) return NULL;
if (!num_font_groups) { PyErr_SetString(PyExc_RuntimeError, "must create font group first"); return NULL; }
sprite_tracker_set_layout(&font_groups->sprite_tracker, w, h);
Py_RETURN_NONE;
}
static PyObject*
test_sprite_position_for(PyObject UNUSED *self, PyObject *args) {
int error;
FREE_AFTER_FUNCTION glyph_index *glyphs = calloc(PyTuple_GET_SIZE(args), sizeof(glyph_index));
for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(args); i++) {
if (!PyLong_Check(PyTuple_GET_ITEM(args, i))) {
PyErr_SetString(PyExc_TypeError, "glyph indices must be integers");
return NULL;
}
glyphs[i] = (glyph_index)PyLong_AsUnsignedLong(PyTuple_GET_ITEM(args, i));
if (PyErr_Occurred()) return NULL;
}
FontGroup *fg = font_groups;
if (!num_font_groups) { PyErr_SetString(PyExc_RuntimeError, "must create font group first"); return NULL; }
SpritePosition *pos = sprite_position_for(fg, &fg->fonts[fg->medium_font_idx], glyphs, PyTuple_GET_SIZE(args), 0, 1, &error);
if (pos == NULL) { sprite_map_set_error(error); return NULL; }
return Py_BuildValue("HHH", pos->x, pos->y, pos->z);
}
static PyObject*
set_send_sprite_to_gpu(PyObject UNUSED *self, PyObject *func) {
Py_CLEAR(python_send_to_gpu_impl);
if (func != Py_None) {
python_send_to_gpu_impl = func;
Py_INCREF(python_send_to_gpu_impl);
}
current_send_sprite_to_gpu = python_send_to_gpu_impl ? python_send_to_gpu : send_sprite_to_gpu;
Py_RETURN_NONE;
}
static PyObject*
test_render_line(PyObject UNUSED *self, PyObject *args) {
PyObject *line;
if (!PyArg_ParseTuple(args, "O!", &Line_Type, &line)) return NULL;
if (!num_font_groups) { PyErr_SetString(PyExc_RuntimeError, "must create font group first"); return NULL; }
render_line((FONTS_DATA_HANDLE)font_groups, (Line*)line, 0, NULL, DISABLE_LIGATURES_NEVER);
Py_RETURN_NONE;
}
static PyObject*
concat_cells(PyObject UNUSED *self, PyObject *args) {
// Concatenate cells returning RGBA data
unsigned int cell_width, cell_height;
int is_32_bit;
PyObject *cells;
if (!PyArg_ParseTuple(args, "IIpO!", &cell_width, &cell_height, &is_32_bit, &PyTuple_Type, &cells)) return NULL;
size_t num_cells = PyTuple_GET_SIZE(cells), r, c, i;
PyObject *ans = PyBytes_FromStringAndSize(NULL, (size_t)4 * cell_width * cell_height * num_cells);
if (ans == NULL) return PyErr_NoMemory();
pixel *dest = (pixel*)PyBytes_AS_STRING(ans);
for (r = 0; r < cell_height; r++) {
for (c = 0; c < num_cells; c++) {
void *s = ((uint8_t*)PyBytes_AS_STRING(PyTuple_GET_ITEM(cells, c)));
if (is_32_bit) {
pixel *src = (pixel*)s + cell_width * r;
for (i = 0; i < cell_width; i++, dest++) {
uint8_t *rgba = (uint8_t*)dest;
rgba[0] = (src[i] >> 24) & 0xff;
rgba[1] = (src[i] >> 16) & 0xff;
rgba[2] = (src[i] >> 8) & 0xff;
rgba[3] = src[i] & 0xff;
}
} else {
uint8_t *src = (uint8_t*)s + cell_width * r;
for (i = 0; i < cell_width; i++, dest++) {
uint8_t *rgba = (uint8_t*)dest;
if (src[i]) { memset(rgba, 0xff, 3); rgba[3] = src[i]; }
else *dest = 0;
}
}
}
}
return ans;
}
static PyObject*
current_fonts(PYNOARG) {
if (!num_font_groups) { PyErr_SetString(PyExc_RuntimeError, "must create font group first"); return NULL; }
PyObject *ans = PyDict_New();
if (!ans) return NULL;
FontGroup *fg = font_groups;
#define SET(key, val) {if (PyDict_SetItemString(ans, #key, fg->fonts[val].face) != 0) { goto error; }}
SET(medium, fg->medium_font_idx);
if (fg->bold_font_idx > 0) SET(bold, fg->bold_font_idx);
if (fg->italic_font_idx > 0) SET(italic, fg->italic_font_idx);
if (fg->bi_font_idx > 0) SET(bi, fg->bi_font_idx);
PyObject *ff = PyTuple_New(fg->fallback_fonts_count);
if (!ff) goto error;
for (size_t i = 0; i < fg->fallback_fonts_count; i++) {
Py_INCREF(fg->fonts[fg->first_fallback_font_idx + i].face);
PyTuple_SET_ITEM(ff, i, fg->fonts[fg->first_fallback_font_idx + i].face);
}
PyDict_SetItemString(ans, "fallback", ff);
Py_CLEAR(ff);
return ans;
error:
Py_CLEAR(ans); return NULL;
#undef SET
}
static PyObject*
get_fallback_font(PyObject UNUSED *self, PyObject *args) {
if (!num_font_groups) { PyErr_SetString(PyExc_RuntimeError, "must create font group first"); return NULL; }
PyObject *text;
int bold, italic;
if (!PyArg_ParseTuple(args, "Upp", &text, &bold, &italic)) return NULL;
CPUCell cpu_cell = {0};
GPUCell gpu_cell = {0};
static Py_UCS4 char_buf[2 + arraysz(cpu_cell.cc_idx)];
if (!PyUnicode_AsUCS4(text, char_buf, arraysz(char_buf), 1)) return NULL;
cpu_cell.ch = char_buf[0];
for (unsigned i = 0; i + 1 < (unsigned) PyUnicode_GetLength(text) && i < arraysz(cpu_cell.cc_idx); i++) cpu_cell.cc_idx[i] = mark_for_codepoint(char_buf[i + 1]);
if (bold) gpu_cell.attrs.bold = true;
if (italic) gpu_cell.attrs.italic = true;
FontGroup *fg = font_groups;
ssize_t ans = fallback_font(fg, &cpu_cell, &gpu_cell);
if (ans == MISSING_FONT) { PyErr_SetString(PyExc_ValueError, "No fallback font found"); return NULL; }
if (ans < 0) { PyErr_SetString(PyExc_ValueError, "Too many fallback fonts"); return NULL; }
return fg->fonts[ans].face;
}
static PyObject*
create_test_font_group(PyObject *self UNUSED, PyObject *args) {
double sz, dpix, dpiy;
if (!PyArg_ParseTuple(args, "ddd", &sz, &dpix, &dpiy)) return NULL;
FontGroup *fg = font_group_for(sz, dpix, dpiy);
if (!fg->sprite_map) send_prerendered_sprites(fg);
return Py_BuildValue("II", fg->cell_width, fg->cell_height);
}
static PyObject*
free_font_data(PyObject *self UNUSED, PyObject *args UNUSED) {
finalize();
Py_RETURN_NONE;
}
static PyObject*
parse_font_feature(PyObject *self UNUSED, PyObject *feature) {
if (!PyUnicode_Check(feature)) {
PyErr_SetString(PyExc_TypeError, "feature must be a unicode object");
return NULL;
}
PyObject *ans = PyBytes_FromStringAndSize(NULL, sizeof(hb_feature_t));
if (!ans) return NULL;
if (!hb_feature_from_string(PyUnicode_AsUTF8(feature), -1, (hb_feature_t*)PyBytes_AS_STRING(ans))) {
Py_CLEAR(ans);
PyErr_Format(PyExc_ValueError, "%U is not a valid font feature", feature);
return NULL;
}
return ans;
}
static PyMethodDef module_methods[] = {
METHODB(set_font_data, METH_VARARGS),
METHODB(free_font_data, METH_NOARGS),
METHODB(parse_font_feature, METH_O),
METHODB(create_test_font_group, METH_VARARGS),
METHODB(sprite_map_set_layout, METH_VARARGS),
METHODB(test_sprite_position_for, METH_VARARGS),
METHODB(concat_cells, METH_VARARGS),
METHODB(set_send_sprite_to_gpu, METH_O),
METHODB(test_shape, METH_VARARGS),
METHODB(current_fonts, METH_NOARGS),
METHODB(test_render_line, METH_VARARGS),
METHODB(get_fallback_font, METH_VARARGS),
{NULL, NULL, 0, NULL} /* Sentinel */
};
bool
init_fonts(PyObject *module) {
harfbuzz_buffer = hb_buffer_create();
if (harfbuzz_buffer == NULL || !hb_buffer_allocation_successful(harfbuzz_buffer) || !hb_buffer_pre_allocate(harfbuzz_buffer, 2048)) { PyErr_NoMemory(); return false; }
hb_buffer_set_cluster_level(harfbuzz_buffer, HB_BUFFER_CLUSTER_LEVEL_MONOTONE_CHARACTERS);
#define create_feature(feature, where) {\
if (!hb_feature_from_string(feature, sizeof(feature) - 1, &hb_features[where])) { \
PyErr_SetString(PyExc_RuntimeError, "Failed to create " feature " harfbuzz feature"); \
return false; \
}}
create_feature("-liga", LIGA_FEATURE);
create_feature("-dlig", DLIG_FEATURE);
create_feature("-calt", CALT_FEATURE);
#undef create_feature
if (PyModule_AddFunctions(module, module_methods) != 0) return false;
current_send_sprite_to_gpu = send_sprite_to_gpu;
return true;
}
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