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Center multi-cell glyph runs

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Kovid Goyal 2017-11-12 11:04:52 +05:30
parent 67a37f1f41
commit cee6ef9941
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GPG Key ID: 06BC317B515ACE7C
1 changed files with 16 additions and 1 deletions
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17
kitty/freetype.c
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@ -400,19 +400,34 @@ place_bitmap_in_canvas(unsigned char *cell, ProcessedBitmap *bm, size_t cell_wid
}
}
static inline void
right_shift_canvas(uint8_t *canvas, size_t width, size_t height, size_t amt) {
uint8_t *src;
size_t r;
for (r = 0, src = canvas; r < height; r++, src += width) {
memmove(src + amt, src, width - amt);
memset(src, 0, amt);
}
}
bool
render_glyphs_in_cells(PyObject *f, bool bold, bool italic, hb_glyph_info_t *info, hb_glyph_position_t *positions, unsigned int num_glyphs, uint8_t *canvas, unsigned int cell_width, unsigned int cell_height, unsigned int num_cells, unsigned int baseline) {
Face *self = (Face*)f;
float x = 0.f, y = 0.f, x_offset = 0.f;
ProcessedBitmap bm;
unsigned int canvas_width = cell_width * num_cells;
for (unsigned int i = 0; i < num_glyphs; i++) {
if (!render_bitmap(self, info[i].codepoint, &bm, cell_width, num_cells, bold, italic, true)) return false;
x_offset = x + (float)positions[i].x_offset / 64.0f;
y = (float)positions[i].y_offset / 64.0f;
if (self->face->glyph->metrics.width > 0 && bm.width > 0) place_bitmap_in_canvas(canvas, &bm, cell_width * num_cells, cell_height, x_offset, y, &self->face->glyph->metrics, baseline);
if (self->face->glyph->metrics.width > 0 && bm.width > 0) place_bitmap_in_canvas(canvas, &bm, canvas_width, cell_height, x_offset, y, &self->face->glyph->metrics, baseline);
x += (float)positions[i].x_advance / 64.0f;
}
unsigned int right_edge = (unsigned int)x, delta;
if (num_cells > 1 && right_edge < canvas_width && (delta = (canvas_width - right_edge) / 2) && delta > 1) {
// center the glyphs in the canvas
right_shift_canvas(canvas, canvas_width, cell_height, delta);
}
return true;
}