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https://github.com/libretro/RetroArch
synced 2025-02-28 12:40:23 +00:00
(font driver) update freetype with unicode support (up to U+FFFF) using
a dynamic atlas.
This commit is contained in:
aliaspider
parent
6f81a19f60
commit
28c2dcf253
@ -24,23 +24,34 @@
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#include <retro_miscellaneous.h>
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#include FT_FREETYPE_H
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#include "../font_driver.h"
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#define FT_ATLAS_ROWS 16
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#define FT_ATLAS_COLS 16
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#define FT_ATLAS_SIZE (FT_ATLAS_ROWS * FT_ATLAS_COLS)
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#if FT_ATLAS_SIZE <= 256
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typedef uint8_t atlas_index_t;
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#else
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typedef uint16_t atlas_index_t;
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#endif
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typedef struct freetype_renderer
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{
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FT_Library lib;
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FT_Face face;
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int max_glyph_width;
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int max_glyph_height;
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struct font_atlas atlas;
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struct font_glyph glyphs[FT_ATLAS_SIZE];
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atlas_index_t uc_to_id[0x10000];
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uint16_t id_to_uc[FT_ATLAS_SIZE];
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unsigned last_used[FT_ATLAS_SIZE];
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unsigned usage_counter;
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} ft_font_renderer_t;
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static const struct font_atlas *font_renderer_ft_get_atlas(void *data)
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static struct font_atlas *font_renderer_ft_get_atlas(void *data)
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{
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ft_font_renderer_t *handle = (ft_font_renderer_t*)data;
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if (!handle)
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@ -48,15 +59,6 @@ static const struct font_atlas *font_renderer_ft_get_atlas(void *data)
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return &handle->atlas;
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}
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static const struct font_glyph *font_renderer_ft_get_glyph(
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void *data, uint32_t code)
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{
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ft_font_renderer_t *handle = (ft_font_renderer_t*)data;
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if (!handle)
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return NULL;
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return code < FT_ATLAS_SIZE ? &handle->glyphs[code] : NULL;
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}
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static void font_renderer_ft_free(void *data)
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{
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ft_font_renderer_t *handle = (ft_font_renderer_t*)data;
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@ -72,96 +74,110 @@ static void font_renderer_ft_free(void *data)
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free(handle);
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}
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static bool font_renderer_create_atlas(ft_font_renderer_t *handle)
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static unsigned font_renderer_get_slot(ft_font_renderer_t *handle)
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{
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unsigned i;
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bool ret = true;
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int i;
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unsigned oldest = 1;
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uint8_t *buffer[FT_ATLAS_SIZE] = {NULL};
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unsigned pitches[FT_ATLAS_SIZE] = {0};
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for (i = 2; i < FT_ATLAS_SIZE; i++)
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if(handle->last_used[i] < handle->last_used[oldest])
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oldest = i;
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unsigned max_width = 0;
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unsigned max_height = 0;
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handle->uc_to_id[handle->id_to_uc[oldest]] = 0;
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handle->id_to_uc[oldest] = 0;
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return oldest;
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}
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for (i = 0; i < FT_ATLAS_SIZE; i++)
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static unsigned font_renderer_update_atlas(ft_font_renderer_t *handle, FT_ULong charcode)
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{
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FT_GlyphSlot slot;
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struct font_glyph *glyph = &handle->glyphs[i];
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if (!glyph)
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continue;
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if(charcode > 0x10000)
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return 0;
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if(handle->uc_to_id[charcode])
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return handle->uc_to_id[charcode];
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if (FT_Load_Char(handle->face, i, FT_LOAD_RENDER))
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{
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ret = false;
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goto end;
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}
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unsigned id = font_renderer_get_slot(handle);
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handle->id_to_uc[id] = charcode;
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handle->uc_to_id[charcode] = id;
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handle->atlas.dirty = true;
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struct font_glyph *glyph = &handle->glyphs[id];
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memset(glyph, 0, sizeof(*glyph)) ;
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if (FT_Load_Char(handle->face, charcode, FT_LOAD_RENDER))
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return -1;
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FT_Render_Glyph(handle->face->glyph, FT_RENDER_MODE_NORMAL);
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slot = handle->face->glyph;
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/* Some glyphs can be blank. */
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buffer[i] = (uint8_t*)calloc(slot->bitmap.rows * slot->bitmap.pitch, 1);
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glyph->width = slot->bitmap.width;
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glyph->height = slot->bitmap.rows;
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pitches[i] = slot->bitmap.pitch;
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glyph->advance_x = slot->advance.x >> 6;
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glyph->advance_y = slot->advance.y >> 6;
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glyph->draw_offset_x = slot->bitmap_left;
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glyph->draw_offset_y = -slot->bitmap_top;
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if (buffer[i] && slot->bitmap.buffer)
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memcpy(buffer[i], slot->bitmap.buffer,
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slot->bitmap.rows * pitches[i]);
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max_width = MAX(max_width, (unsigned)slot->bitmap.width);
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max_height = MAX(max_height, (unsigned)slot->bitmap.rows);
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}
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handle->atlas.width = max_width * FT_ATLAS_COLS;
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handle->atlas.height = max_height * FT_ATLAS_ROWS;
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handle->atlas.buffer = (uint8_t*)
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calloc(handle->atlas.width * handle->atlas.height, 1);
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if (!handle->atlas.buffer)
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{
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ret = false;
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goto end;
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}
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/* Blit our texture atlas. */
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for (i = 0; i < FT_ATLAS_SIZE; i++)
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{
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uint8_t *dst = NULL;
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unsigned offset_x = (i % FT_ATLAS_COLS) * max_width;
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unsigned offset_y = (i / FT_ATLAS_COLS) * max_height;
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unsigned offset_x = (id % FT_ATLAS_COLS) * handle->max_glyph_width;
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unsigned offset_y = (id / FT_ATLAS_COLS) * handle->max_glyph_height;
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handle->glyphs[i].atlas_offset_x = offset_x;
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handle->glyphs[i].atlas_offset_y = offset_y;
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handle->glyphs[id].atlas_offset_x = offset_x;
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handle->glyphs[id].atlas_offset_y = offset_y;
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dst = (uint8_t*)handle->atlas.buffer;
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dst += offset_x + offset_y * handle->atlas.width;
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if (buffer[i])
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if (slot->bitmap.buffer)
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{
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unsigned r, c;
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const uint8_t *src = (const uint8_t*)buffer[i];
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const uint8_t *src = (const uint8_t*)slot->bitmap.buffer;
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for (r = 0; r < handle->glyphs[i].height;
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r++, dst += handle->atlas.width, src += pitches[i])
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for (c = 0; c < handle->glyphs[i].width; c++)
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for (r = 0; r < handle->glyphs[id].height;
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r++, dst += handle->atlas.width, src += slot->bitmap.pitch)
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for (c = 0; c < handle->glyphs[id].width; c++)
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dst[c] = src[c];
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}
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handle->usage_counter++;
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return id;
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}
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end:
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for (i = 0; i < FT_ATLAS_SIZE; i++)
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free(buffer[i]);
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return ret;
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static const struct font_glyph *font_renderer_ft_get_glyph(
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void *data, uint32_t code)
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{
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ft_font_renderer_t *handle = (ft_font_renderer_t*)data;
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if (!handle)
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return NULL;
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if(code > 0x10000)
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return NULL;
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unsigned id = handle->uc_to_id[code];
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if(!id)
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id = font_renderer_update_atlas(handle, (FT_ULong)code);
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handle->last_used[id] = handle->usage_counter++;
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return &handle->glyphs[id];
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}
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static bool font_renderer_create_atlas(ft_font_renderer_t *handle)
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{
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unsigned i;
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for (i = 0; i < 256; i++)
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if(font_renderer_update_atlas(handle, i) < 0)
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return false;
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return true;
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}
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#include "locale.h"
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static void *font_renderer_ft_init(const char *font_path, float font_size)
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{
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FT_Error err;
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@ -172,6 +188,9 @@ static void *font_renderer_ft_init(const char *font_path, float font_size)
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if (!handle)
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goto error;
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if (font_size < 1.0)
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goto error;
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err = FT_Init_FreeType(&handle->lib);
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if (err)
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goto error;
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@ -180,10 +199,26 @@ static void *font_renderer_ft_init(const char *font_path, float font_size)
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if (err)
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goto error;
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err = FT_Select_Charmap(handle->face, FT_ENCODING_UNICODE);
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if (err)
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goto error;
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err = FT_Set_Pixel_Sizes(handle->face, 0, font_size);
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if (err)
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goto error;
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/* TODO: find a better way to determine onmax_glyph_width/height */
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handle->max_glyph_width = font_size;
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handle->max_glyph_height = font_size;
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handle->atlas.width = handle->max_glyph_width * 2 * FT_ATLAS_COLS;
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handle->atlas.height = handle->max_glyph_height * 2 * FT_ATLAS_ROWS;
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handle->atlas.buffer = (uint8_t*)
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calloc(handle->atlas.width * handle->atlas.height, 1);
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if (!handle->atlas.buffer)
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return false;
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if (!font_renderer_create_atlas(handle))
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goto error;
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