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feat(src/renderer): stream fonts with SDL_RWops on all platforms (#1555) 

* feat(src/renderer): stream fonts with SDL_RWops on all platforms

This fixes #1529 where the font itself carries the font file, which gets copied around.
This commit streams the file, so the file is not entirely in memory.

* style(src/renderer): use standard C types

* refactor(src/renderer): implement FT_Stream.close

* fix(src/renderer): fix SDL_RWops double free
This commit is contained in:
Takase 2023-07-11 09:45:36 +08:00 committed by George Sokianos
parent 523e62bdce
commit 60e71160b6
1 changed files with 48 additions and 63 deletions
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111
src/renderer.c
View File

@ -7,6 +7,7 @@
#include FT_FREETYPE_H
#include FT_LCD_FILTER_H
#include FT_OUTLINE_H
#include FT_SYSTEM_H
#ifdef _WIN32
#include <windows.h>
@ -50,6 +51,7 @@ typedef struct {
typedef struct RenFont {
FT_Face face;
FT_StreamRec stream;
GlyphSet* sets[SUBPIXEL_BITMAPS_CACHED][MAX_LOADABLE_GLYPHSETS];
float size, space_advance, tab_advance;
unsigned short max_height, baseline, height;
@ -57,10 +59,6 @@ typedef struct RenFont {
ERenFontHinting hinting;
unsigned char style;
unsigned short underline_thickness;
#ifdef _WIN32
unsigned char *file;
HANDLE file_handle;
#endif
char path[];
} RenFont;
@ -215,54 +213,49 @@ static void font_clear_glyph_cache(RenFont* font) {
}
}
// based on https://github.com/libsdl-org/SDL_ttf/blob/2a094959055fba09f7deed6e1ffeb986188982ae/SDL_ttf.c#L1735
static unsigned long font_file_read(FT_Stream stream, unsigned long offset, unsigned char *buffer, unsigned long count) {
uint64_t amount;
SDL_RWops *file = (SDL_RWops *) stream->descriptor.pointer;
SDL_RWseek(file, (int) offset, RW_SEEK_SET);
if (count == 0)
return 0;
amount = SDL_RWread(file, buffer, sizeof(char), count);
if (amount <= 0)
return 0;
return (unsigned long) amount;
}
static void font_file_close(FT_Stream stream) {
if (stream && stream->descriptor.pointer) {
SDL_RWclose((SDL_RWops *) stream->descriptor.pointer);
stream->descriptor.pointer = NULL;
}
}
RenFont* ren_font_load(RenWindow *window_renderer, const char* path, float size, ERenFontAntialiasing antialiasing, ERenFontHinting hinting, unsigned char style) {
RenFont *font = NULL;
FT_Face face = NULL;
SDL_RWops *file = SDL_RWFromFile(path, "rb");
if (!file)
goto rwops_failure;
#ifdef _WIN32
int len = strlen(path);
font = check_alloc(calloc(1, sizeof(RenFont) + len + 1));
font->stream.read = font_file_read;
font->stream.close = font_file_close;
font->stream.descriptor.pointer = file;
font->stream.pos = 0;
font->stream.size = (unsigned long) SDL_RWsize(file);
HANDLE file = INVALID_HANDLE_VALUE;
DWORD read;
int font_file_len = 0;
unsigned char *font_file = NULL;
wchar_t *wpath = NULL;
if ((wpath = utfconv_utf8towc(path)) == NULL)
return NULL;
if ((file = CreateFileW(wpath,
GENERIC_READ,
FILE_SHARE_READ, // or else we can't copy fonts
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL)) == INVALID_HANDLE_VALUE)
if (FT_Open_Face(library, &(FT_Open_Args){ .flags = FT_OPEN_STREAM, .stream = &font->stream }, 0, &face))
goto failure;
if ((font_file_len = GetFileSize(file, NULL)) == INVALID_FILE_SIZE)
goto failure;
font_file = check_alloc(malloc(font_file_len * sizeof(unsigned char)));
if (!ReadFile(file, font_file, font_file_len, &read, NULL) || read != font_file_len)
goto failure;
free(wpath);
wpath = NULL;
if (FT_New_Memory_Face(library, font_file, read, 0, &face))
goto failure;
#else
if (FT_New_Face(library, path, 0, &face))
return NULL;
#endif
const int surface_scale = renwin_get_surface(window_renderer).scale;
if (FT_Set_Pixel_Sizes(face, 0, (int)(size*surface_scale)))
goto failure;
int len = strlen(path);
RenFont* font = check_alloc(calloc(1, sizeof(RenFont) + len + 1));
strcpy(font->path, path);
font->face = face;
font->size = size;
@ -272,32 +265,28 @@ RenFont* ren_font_load(RenWindow *window_renderer, const char* path, float size,
font->hinting = hinting;
font->style = style;
#ifdef _WIN32
// we need to keep this for freetype
font->file = font_file;
font->file_handle = file;
#endif
if(FT_IS_SCALABLE(face))
font->underline_thickness = (unsigned short)((face->underline_thickness / (float)face->units_per_EM) * font->size);
if(!font->underline_thickness) font->underline_thickness = ceil((double) font->height / 14.0);
if(!font->underline_thickness)
font->underline_thickness = ceil((double) font->height / 14.0);
if (FT_Load_Char(face, ' ', font_set_load_options(font))) {
free(font);
if (FT_Load_Char(face, ' ', font_set_load_options(font)))
goto failure;
}
font->space_advance = face->glyph->advance.x / 64.0f;
font->tab_advance = font->space_advance * 2;
return font;
failure:
#ifdef _WIN32
free(wpath);
free(font_file);
if (file != INVALID_HANDLE_VALUE) CloseHandle(file);
#endif
if (face != NULL)
if (face)
FT_Done_Face(face);
if (font)
free(font);
return NULL;
rwops_failure:
if (file)
SDL_RWclose(file);
return NULL;
}
@ -316,10 +305,6 @@ const char* ren_font_get_path(RenFont *font) {
void ren_font_free(RenFont* font) {
font_clear_glyph_cache(font);
FT_Done_Face(font->face);
#ifdef _WIN32
free(font->file);
CloseHandle(font->file_handle);
#endif
free(font);
}