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freetype.c: fix some memory corruption issues.

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This commit is contained in:
aliaspider 2016-10-21 20:55:36 +01:00
parent 7dcb57f22d
commit 150a0138d5
1 changed files with 24 additions and 21 deletions
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45
gfx/drivers_font_renderer/freetype.c
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@ -95,7 +95,7 @@ static unsigned font_renderer_update_atlas(ft_font_renderer_t *handle, FT_ULong
uint8_t *dst = NULL; uint8_t *dst = NULL;
struct font_glyph *glyph = NULL; struct font_glyph *glyph = NULL;
if(charcode > 0x10000) if(charcode > 0xFFFF)
return 0; return 0;
if(handle->uc_to_id[charcode]) if(handle->uc_to_id[charcode])
return handle->uc_to_id[charcode]; return handle->uc_to_id[charcode];
@ -153,7 +153,6 @@ static unsigned font_renderer_update_atlas(ft_font_renderer_t *handle, FT_ULong
dst[c] = src[c]; dst[c] = src[c];
} }
handle->usage_counter++;
return id; return id;
} }
@ -166,7 +165,7 @@ static const struct font_glyph *font_renderer_ft_get_glyph(
if (!handle) if (!handle)
return NULL; return NULL;
if(code > 0x10000) if(code > 0xFFFF)
return NULL; return NULL;
id = handle->uc_to_id[code]; id = handle->uc_to_id[code];
@ -179,20 +178,35 @@ static const struct font_glyph *font_renderer_ft_get_glyph(
return &handle->glyphs[id]; return &handle->glyphs[id];
} }
static bool font_renderer_create_atlas(ft_font_renderer_t *handle) static bool font_renderer_create_atlas(ft_font_renderer_t *handle, int max_glyph_width, int max_glyph_height)
{ {
unsigned i; unsigned i, id;
handle->max_glyph_width = max_glyph_width;
handle->max_glyph_height = max_glyph_height;
handle->atlas.width = handle->max_glyph_width * FT_ATLAS_COLS;
handle->atlas.height = handle->max_glyph_height * FT_ATLAS_ROWS;
handle->atlas.buffer = (uint8_t*)
calloc(handle->atlas.width * handle->atlas.height, 1);
if (!handle->atlas.buffer)
return false;
handle->usage_counter = 1;
for (i = 0; i < 256; i++) for (i = 0; i < 256; i++)
if(font_renderer_update_atlas(handle, i) < 0) {
return false; id = font_renderer_update_atlas(handle, i);
if(id)
handle->last_used[id] = handle->usage_counter++;
}
return true; return true;
} }
#include "locale.h"
static void *font_renderer_ft_init(const char *font_path, float font_size) static void *font_renderer_ft_init(const char *font_path, float font_size)
{ {
int i;
FT_Error err; FT_Error err;
ft_font_renderer_t *handle = (ft_font_renderer_t*) ft_font_renderer_t *handle = (ft_font_renderer_t*)
@ -220,19 +234,8 @@ static void *font_renderer_ft_init(const char *font_path, float font_size)
if (err) if (err)
goto error; goto error;
/* TODO: find a better way to determine onmax_glyph_width/height */ /* TODO: find a better way to determine nmax_glyph_width/height */
handle->max_glyph_width = font_size; if (!font_renderer_create_atlas(handle, font_size, font_size))
handle->max_glyph_height = font_size;
handle->atlas.width = handle->max_glyph_width * 2 * FT_ATLAS_COLS;
handle->atlas.height = handle->max_glyph_height * 2 * FT_ATLAS_ROWS;
handle->atlas.buffer = (uint8_t*)
calloc(handle->atlas.width * handle->atlas.height, 1);
if (!handle->atlas.buffer)
goto error;
if (!font_renderer_create_atlas(handle))
goto error; goto error;
return handle; return handle;