61 lines
2 KiB
C
61 lines
2 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include "pxl8_font.h"
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pxl8_result pxl8_font_create_atlas(const pxl8_font* font, u8** atlas_data, i32* atlas_width, i32* atlas_height) {
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if (!font || !atlas_data || !atlas_width || !atlas_height) {
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return PXL8_ERROR_NULL_POINTER;
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}
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i32 glyphs_per_row = 16;
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i32 rows_needed = (font->glyph_count + glyphs_per_row - 1) / glyphs_per_row;
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*atlas_width = glyphs_per_row * font->default_width;
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*atlas_height = rows_needed * font->default_height;
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i32 atlas_size = (*atlas_width) * (*atlas_height);
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*atlas_data = (u8*)malloc(atlas_size);
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if (!*atlas_data) {
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return PXL8_ERROR_OUT_OF_MEMORY;
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}
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memset(*atlas_data, 0, atlas_size);
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for (u32 i = 0; i < font->glyph_count; i++) {
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const pxl8_glyph* glyph = &font->glyphs[i];
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i32 atlas_x = (i % glyphs_per_row) * font->default_width;
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i32 atlas_y = (i / glyphs_per_row) * font->default_height;
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for (i32 y = 0; y < glyph->height && y < font->default_height; y++) {
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for (i32 x = 0; x < glyph->width && x < font->default_width; x++) {
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i32 atlas_idx = (atlas_y + y) * (*atlas_width) + (atlas_x + x);
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if (glyph->format == PXL8_FONT_FORMAT_INDEXED) {
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u8 pixel_byte = glyph->data.indexed[y];
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u8 pixel_bit = (pixel_byte >> x) & 1;
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(*atlas_data)[atlas_idx] = pixel_bit ? 255 : 0;
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} else {
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i32 glyph_idx = y * 8 + x;
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u32 rgba_pixel = glyph->data.rgba[glyph_idx];
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(*atlas_data)[atlas_idx] = (rgba_pixel >> 24) & 0xFF;
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}
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}
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}
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}
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return PXL8_OK;
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}
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const pxl8_glyph* pxl8_font_find_glyph(const pxl8_font* font, u32 codepoint) {
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if (!font || !font->glyphs) return NULL;
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for (u32 i = 0; i < font->glyph_count; i++) {
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if (font->glyphs[i].codepoint == codepoint) {
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return &font->glyphs[i];
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}
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}
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return NULL;
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}
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