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Implement resizing cells rendering on CoreText

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This commit is contained in:
Kovid Goyal 2019-03-04 13:26:23 +05:30
parent fd7ddc2905
commit 16c0871e22
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 25 additions and 1 deletions
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26
kitty/core_text.m
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@ -374,7 +374,7 @@ ensure_render_space(size_t width, size_t height) {
static inline void
render_glyphs(CTFontRef font, unsigned int width, unsigned int height, unsigned int baseline, unsigned int num_glyphs) {
memset(render_buf, 0, render_buf_sz);
memset(render_buf, 0, width * height);
CGColorSpaceRef gray_color_space = CGColorSpaceCreateDeviceGray();
CGContextRef render_ctx = CGBitmapContextCreate(render_buf, width, height, 8, width, gray_color_space, (kCGBitmapAlphaInfoMask & kCGImageAlphaNone));
if (render_ctx == NULL || gray_color_space == NULL) fatal("Out of memory");
@ -391,6 +391,30 @@ render_glyphs(CTFontRef font, unsigned int width, unsigned int height, unsigned
CGColorSpaceRelease(gray_color_space);
}
StringCanvas
render_simple_text_impl(PyObject *s, const char *text, unsigned int baseline) {
CTFace *self = (CTFace*)s;
CTFontRef font = self->ct_font;
size_t num_chars = strnlen(text, 32);
unichar chars[num_chars];
CGSize advances[num_chars];
for (size_t i = 0; i < num_chars; i++) chars[i] = text[i];
CTFontGetGlyphsForCharacters(font, chars, glyphs, num_chars);
CTFontGetAdvancesForGlyphs(font, kCTFontOrientationDefault, glyphs, advances, num_chars);
CGRect bounding_box = CTFontGetBoundingRectsForGlyphs(font, kCTFontOrientationDefault, glyphs, boxes, num_chars);
StringCanvas ans = { .width = 0, .height = 2 * bounding_box.size.height };
for (size_t i = 0, y = 0; i < num_chars; i++) {
positions[i] = CGPointMake(ans.width, y);
ans.width += advances[i].width; y += advances[i].height;
}
ensure_render_space(ans.width, ans.height);
render_glyphs(font, ans.width, ans.height, baseline, num_chars);
ans.canvas = malloc(ans.width * ans.height);
if (ans.canvas) memcpy(ans.canvas, render_buf, ans.width * ans.height);
return ans;
}
static inline bool
do_render(CTFontRef ct_font, bool bold, bool 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, bool allow_resize, FONTS_DATA_HANDLE fg, bool center_glyph) {
unsigned int canvas_width = cell_width * num_cells;