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Finish up CoreText based rendering

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Kovid Goyal 2017-12-11 19:04:44 +05:30
parent c86c166448
commit 005c4bf29e
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GPG Key ID: 06BC317B515ACE7C
2 changed files with 14 additions and 23 deletions
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2
CHANGELOG.rst
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@ -22,6 +22,8 @@ version 0.6.0 [future]
- Support colored emoji
- Use CoreText instead of FreeType to render text on macOS
- Add a new "grid" window layout
- Drop the dependency on glfw (kitty now uses a modified, bundled copy of glfw)

35
kitty/core_text.m
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@ -285,6 +285,7 @@ static uint8_t *render_buf = NULL;
static size_t render_buf_sz = 0;
static CGGlyph glyphs[128];
static CGRect boxes[128];
static CGPoint positions[128];
static void
finalize(void) {
@ -328,7 +329,7 @@ ensure_render_space(size_t width, size_t height) {
}
static inline void
render_glyph(CTFontRef font, CGGlyph glyph, unsigned int width, unsigned int height, unsigned int baseline, unsigned int i) {
render_glyphs(CTFontRef font, unsigned int width, unsigned int height, unsigned int baseline, unsigned int num_glyphs) {
memset(render_buf, 0, render_buf_sz);
CGColorSpaceRef gray_color_space = CGColorSpaceCreateDeviceGray();
CGContextRef render_ctx = CGBitmapContextCreate(render_buf, width, height, 8, width, gray_color_space, (kCGBitmapAlphaInfoMask & kCGImageAlphaNone));
@ -338,39 +339,27 @@ render_glyph(CTFontRef font, CGGlyph glyph, unsigned int width, unsigned int hei
CGContextSetGrayFillColor(render_ctx, 1, 1); // white glyphs
CGContextSetTextDrawingMode(render_ctx, kCGTextFill);
CGContextSetTextMatrix(render_ctx, CGAffineTransformIdentity);
CGContextSetTextPosition(render_ctx, MAX(0, -boxes[i].origin.x), height - baseline);
CGPoint p = CGPointMake(0, 0);
CTFontDrawGlyphs(font, &glyph, &p, 1, render_ctx);
}
static inline void
place_glyph_in_canvas(unsigned int i, float x_offset, float y_offset, pixel *canvas, unsigned int canvas_width, unsigned int cell_height) {
Region src = {.bottom=cell_height, .right=canvas_width}, dest = {.bottom=cell_height, .right=canvas_width};
// Calculate column bounds
float bearing_x = boxes[i].origin.x;
(void)bearing_x;
(void)x_offset;
(void)y_offset;
render_alpha_mask(render_buf, canvas, &src, &dest, canvas_width, canvas_width);
CGContextSetTextPosition(render_ctx, 0, height - baseline);
CTFontDrawGlyphs(font, glyphs, positions, num_glyphs, render_ctx);
}
bool
render_glyphs_in_cells(PyObject *s, bool UNUSED bold, bool UNUSED italic, hb_glyph_info_t *info, hb_glyph_position_t *positions, unsigned int num_glyphs, pixel *canvas, unsigned int cell_width, unsigned int cell_height, unsigned int num_cells, unsigned int baseline, bool *was_colored) {
render_glyphs_in_cells(PyObject *s, bool UNUSED bold, bool UNUSED italic, hb_glyph_info_t *info, hb_glyph_position_t *hb_positions, unsigned int num_glyphs, pixel *canvas, unsigned int cell_width, unsigned int cell_height, unsigned int num_cells, unsigned int baseline, bool *was_colored) {
CTFace *self = (CTFace*)s;
unsigned int canvas_width = cell_width * num_cells;
for (unsigned i=0; i < num_glyphs; i++) glyphs[i] = info[i].codepoint;
CGRect br = CTFontGetBoundingRectsForGlyphs(self->ct_font, kCTFontOrientationHorizontal, glyphs, boxes, num_glyphs);
float x = 0.f, y_offset = 0.f, x_offset = 0.f;
for (unsigned i=0; i < num_glyphs; i++) {
positions[i].x = MAX(0, -boxes[i].origin.x) + hb_positions[i].x_offset / 64.f;
positions[i].y = hb_positions[i].y_offset / 64.f;
}
if (*was_colored) {
render_color_glyph(self->ct_font, (uint8_t*)canvas, info[0].codepoint, cell_width * num_cells, cell_height, baseline);
} else {
ensure_render_space(canvas_width, cell_height);
for (unsigned int i = 0; i < num_glyphs; i++) {
render_glyph(self->ct_font, info[i].codepoint, canvas_width, cell_height, baseline, i);
place_glyph_in_canvas(i, x + x_offset, y_offset, canvas, canvas_width, cell_height);
x += (float)positions[i].x_advance / 64.0f;
}
render_glyphs(self->ct_font, canvas_width, cell_height, baseline, num_glyphs);
Region src = {.bottom=cell_height, .right=canvas_width}, dest = {.bottom=cell_height, .right=canvas_width};
render_alpha_mask(render_buf, canvas, &src, &dest, canvas_width, canvas_width);
}
if (num_cells > 1) {
// center glyphs