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font_wip branch: new WIP font stuff using "stb_truetype.h",

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not implemented for EAN/UPC, not fully tested
This commit is contained in:
gitlost
2026-07-27 12:21:19 +01:00
parent d6a4bdfe90
commit a4f0fa0fd2
144 changed files with 8276 additions and 1567 deletions
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backend/png.c
+32 -4
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@@ -108,13 +108,14 @@ INTERNAL int zint_png_pixel_plot(struct zint_symbol *symbol, const unsigned char
png_color bg, fg;
unsigned char bg_alpha, fg_alpha;
unsigned char map[128];
png_color palette[32];
png_color palette[256];
int num_palette;
unsigned char trans_alpha[32];
unsigned char trans_alpha[256];
int num_trans; /* Note initialize below to avoid gcc -Wclobbered warning due to `longjmp()` */
int bit_depth;
int compression_strategy;
const unsigned char *pb;
const int grayscale = zint_out_grayscale(symbol);
unsigned char *outdata = (unsigned char *) z_alloca(symbol->bitmap_width);
zpng_error.symbol = symbol;
@@ -176,6 +177,25 @@ INTERNAL int zint_png_pixel_plot(struct zint_symbol *symbol, const unsigned char
}
}
}
} else if (grayscale) {
const int diff_red = fg.red - bg.red;
const int diff_green = fg.green - bg.green;
const int diff_blue = fg.blue - bg.blue;
for (num_palette = 0; num_palette <= 0xFF; num_palette++) {
png_color color;
color.red = bg.red + (diff_red * num_palette) / 0xFF;
color.green = bg.green + (diff_green * num_palette) / 0xFF;
color.blue = bg.blue + (diff_blue * num_palette) / 0xFF;
palette[num_palette] = color;
}
if (bg_alpha != 0xFF || fg_alpha != 0xFF) {
trans_alpha[num_trans++] = bg_alpha;
if (fg_alpha != 0xFF) {
for (; num_trans <= 0xFF; num_trans++) {
trans_alpha[num_trans] = fg_alpha;
}
}
}
} else {
int bg_idx = 0, fg_idx = 1;
/* Do alphas first so can swop indexes if background not alpha */
@@ -200,8 +220,10 @@ INTERNAL int zint_png_pixel_plot(struct zint_symbol *symbol, const unsigned char
if (num_palette <= 2) {
bit_depth = 1;
} else {
} else if (num_palette <= 16) {
bit_depth = 4;
} else {
bit_depth = 8;
}
/* Open output file in binary mode */
@@ -280,7 +302,7 @@ INTERNAL int zint_png_pixel_plot(struct zint_symbol *symbol, const unsigned char
/* write row contents to file */
png_write_row(png_ptr, outdata);
}
} else { /* Bit depth 4 */
} else if (bit_depth == 4) {
for (row = 0; row < symbol->bitmap_height; row++) {
if (row && memcmp(pb, pb - symbol->bitmap_width, symbol->bitmap_width) == 0) {
pb += symbol->bitmap_width;
@@ -303,6 +325,12 @@ INTERNAL int zint_png_pixel_plot(struct zint_symbol *symbol, const unsigned char
}
#endif
}
} else { /* Bit depth 8 */
for (row = 0; row < symbol->bitmap_height; row++) {
/* write row contents to file */
png_write_row(png_ptr, pb);
pb += symbol->bitmap_width;
}
}
/* End the file */