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font: add font_glyph_for_utf8()

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This function fills in a struct glyph with glyph bitmap data for the
provided utf-8 character (essentially a FT_Bitmap wrapped in a cairo
surface).
This commit is contained in:
Daniel Eklöf 2019-07-28 20:37:59 +02:00
parent 175dc9cf94
commit 9e57ba2108
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GPG key ID: 5BBD4992C116573F
4 changed files with 94 additions and 76 deletions
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84
render.c
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@ -5,8 +5,6 @@
#include <sys/time.h>
#include <sys/timerfd.h>
#include <cairo-ft.h>
#include <wayland-cursor.h>
#include <xdg-shell.h>
@ -15,6 +13,7 @@
#include "log.h"
#include "shm.h"
#include "grid.h"
#include "font.h"
#define min(x, y) ((x) < (y) ? (x) : (y))
#define max(x, y) ((x) > (y) ? (x) : (y))
@ -312,81 +311,20 @@ render_cell(struct terminal *term, struct buffer *buf, const struct cell *cell,
: NULL;
if (e == NULL || e->data == NULL) {
wchar_t wc;
int res __attribute__((unused)) = mbstowcs(&wc, cell->c, 1);
if (res != 1)
return;
FT_Face ft_face = font->face;
FT_UInt glyph_idx = FT_Get_Char_Index(ft_face, wc);
FT_Error ft_err = FT_Load_Glyph(ft_face, glyph_idx, FT_LOAD_DEFAULT);
if (ft_err != 0) {
LOG_ERR("FT_Load_Glyph");
struct glyph g;
if (!font_glyph_for_utf8(font, cell->c, &g))
goto done;
}
ft_err = FT_Render_Glyph(ft_face->glyph, FT_RENDER_MODE_NORMAL);
if (ft_err != 0) {
LOG_ERR("FT_Render_Glyph");
goto done;
}
FT_Bitmap *bitmap = &ft_face->glyph->bitmap;
assert(bitmap->pixel_mode == FT_PIXEL_MODE_GRAY ||
bitmap->pixel_mode == FT_PIXEL_MODE_MONO);
cairo_format_t cr_format = bitmap->pixel_mode == FT_PIXEL_MODE_GRAY
? CAIRO_FORMAT_A8 : CAIRO_FORMAT_A1;
int stride = cairo_format_stride_for_width(cr_format, buf->width);
assert(stride >= bitmap->pitch);
uint8_t *copy = malloc(bitmap->rows * stride);
switch (bitmap->pixel_mode) {
case FT_PIXEL_MODE_MONO: {
for (size_t r = 0; r < bitmap->rows; r++) {
for (size_t c = 0; c < bitmap->width; c++) {
uint8_t v = bitmap->buffer[r * bitmap->pitch + c];
uint8_t reversed = 0;
for (size_t i = 0; i < 8; i++) {
reversed |= (v & 1) << (7 - i);
v >>= 1;
}
copy[r * stride + c] = reversed;
}
}
break;
}
case FT_PIXEL_MODE_GRAY:
for (size_t r = 0; r < bitmap->rows; r++) {
for (size_t c = 0; c < bitmap->width; c++)
copy[r * stride + c] = bitmap->buffer[r * bitmap->pitch + c];
}
break;
default:
LOG_ERR("unimplemented FT bitmap pixel mode: %d", bitmap->pixel_mode);
abort();
break;
}
glyph = cairo_image_surface_create_for_data(
copy, cr_format, bitmap->width, bitmap->rows, stride);
left = ft_face->glyph->bitmap_left;
top = ft_face->glyph->bitmap_top;
assert(cairo_surface_status(glyph) == CAIRO_STATUS_SUCCESS);
if (e != NULL) {
e->data = copy;
e->surf = glyph;
e->left = left;
e->top = top;
e->data = g.data;
e->surf = g.surf;
e->left = g.left;
e->top = g.top;
}
glyph = g.surf;
left = g.left;
top = g.top;
} else {
glyph = e->surf;
left = e->left;