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author | peter1138 <peter1138@openttd.org> | 2006-11-16 22:05:33 +0000 |
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committer | peter1138 <peter1138@openttd.org> | 2006-11-16 22:05:33 +0000 |
commit | 1a4f1c8177f7ee351cb0096e3456d055b97dc60a (patch) | |
tree | 4fb6c0fac873efffc85cef437baa70d50d51fdfb /fontcache.c | |
parent | 40d647ddde652bb8f1c7b4215279cc82d01ca38f (diff) | |
download | openttd-1a4f1c8177f7ee351cb0096e3456d055b97dc60a.tar.xz |
(svn r7182) -Feature: Merge utf8 branch. This brings us support for Unicode/UTF-8 and the option for fonts rendered by FreeType. Language changes to come.
Diffstat (limited to 'fontcache.c')
-rw-r--r-- | fontcache.c | 310 |
1 files changed, 310 insertions, 0 deletions
diff --git a/fontcache.c b/fontcache.c new file mode 100644 index 000000000..4cfba83e8 --- /dev/null +++ b/fontcache.c @@ -0,0 +1,310 @@ +/* $Id$ */ + +#include "stdafx.h" +#include "openttd.h" +#include "functions.h" +#include "macros.h" +#include "debug.h" +#include "table/sprites.h" +#include "table/control_codes.h" +#include "spritecache.h" +#include "gfx.h" +#include "string.h" +#include "fontcache.h" + +#ifdef WITH_FREETYPE + +#include <ft2build.h> +#include FT_FREETYPE_H +#include FT_GLYPH_H + +static FT_Library _library = NULL; +static FT_Face _face_small = NULL; +static FT_Face _face_medium = NULL; +static FT_Face _face_large = NULL; + +FreeTypeSettings _freetype; + +enum { + FACE_COLOUR = 1, + SHADOW_COLOUR = 2, +}; + + +static void LoadFreeTypeFont(const char *font_name, FT_Face *face, const char *type) +{ + FT_Error error; + + if (strlen(font_name) == 0) return; + + error = FT_New_Face(_library, font_name, 0, face); + if (error == FT_Err_Ok) { + /* Attempt to select the unicode character map */ + error = FT_Select_Charmap(*face, ft_encoding_unicode); + if (error == FT_Err_Ok) { + /* Success */ + return; + } else if (error == FT_Err_Invalid_CharMap_Handle) { + /* Try to pick a different character map instead. We default to + * the first map, but platform_id 0 encoding_id 0 should also + * be unicode (strange system...) */ + FT_CharMap found = (*face)->charmaps[0]; + int i; + + for (i = 0; i < (*face)->num_charmaps; i++) { + FT_CharMap charmap = (*face)->charmaps[i]; + if (charmap->platform_id == 0 && charmap->encoding_id == 0) { + found = charmap; + } + } + + if (found != NULL) { + error = FT_Set_Charmap(*face, found); + if (error == FT_Err_Ok) return; + } + } + + FT_Done_Face(*face); + *face = NULL; + } + + ShowInfoF("Unable to use '%s' for %s font, FreeType reported error 0x%X, using sprite font instead", font_name, type, error); +} + + +void InitFreeType(void) +{ + if (strlen(_freetype.small_font) == 0 && strlen(_freetype.medium_font) == 0 && strlen(_freetype.large_font) == 0) { + DEBUG(freetype, 1) ("[FreeType] No font faces specified, using sprite fonts instead"); + return; + } + + if (FT_Init_FreeType(&_library) != FT_Err_Ok) { + ShowInfoF("Unable to initialize FreeType, using sprite fonts instead"); + return; + } + + DEBUG(freetype, 2) ("[FreeType] Initialized"); + + /* Load each font */ + LoadFreeTypeFont(_freetype.small_font, &_face_small, "small"); + LoadFreeTypeFont(_freetype.medium_font, &_face_medium, "medium"); + LoadFreeTypeFont(_freetype.large_font, &_face_large, "large"); + + /* Set each font size */ + if (_face_small != NULL) FT_Set_Pixel_Sizes(_face_small, 0, _freetype.small_size); + if (_face_medium != NULL) FT_Set_Pixel_Sizes(_face_medium, 0, _freetype.medium_size); + if (_face_large != NULL) FT_Set_Pixel_Sizes(_face_large, 0, _freetype.large_size); +} + + +static FT_Face GetFontFace(FontSize size) +{ + switch (size) { + default: NOT_REACHED(); + case FS_NORMAL: return _face_medium; + case FS_SMALL: return _face_small; + case FS_LARGE: return _face_large; + } +} + + +typedef struct GlyphEntry { + Sprite *sprite; + byte width; +} GlyphEntry; + + +/* The glyph cache. This is structured to reduce memory consumption. + * 1) There is a 'segment' table for each font size. + * 2) Each segment table is a discrete block of characters. + * 3) Each block contains 256 (aligned) characters sequential characters. + * + * The cache is accessed in the following way: + * For character 0x0041 ('A'): _glyph_ptr[FS_NORMAL][0x00][0x41] + * For character 0x20AC (Euro): _glyph_ptr[FS_NORMAL][0x20][0xAC] + * + * Currently only 256 segments are allocated, "limiting" us to 65536 characters. + * This can be simply changed in the two functions Get & SetGlyphPtr. + */ +static GlyphEntry **_glyph_ptr[FS_END]; + + +static GlyphEntry *GetGlyphPtr(FontSize size, WChar key) +{ + if (_glyph_ptr[size] == NULL) return NULL; + if (_glyph_ptr[size][GB(key, 8, 8)] == NULL) return NULL; + return &_glyph_ptr[size][GB(key, 8, 8)][GB(key, 0, 8)]; +} + + +static void SetGlyphPtr(FontSize size, WChar key, const GlyphEntry *glyph) +{ + if (_glyph_ptr[size] == NULL) { + DEBUG(freetype, 3) ("[FreeType] Allocating root glyph cache for size %u", size); + _glyph_ptr[size] = calloc(256, sizeof(**_glyph_ptr)); + } + + if (_glyph_ptr[size][GB(key, 8, 8)] == NULL) { + DEBUG(freetype, 3) ("[FreeType] Allocating glyph cache for range 0x%02X00, size %u", GB(key, 8, 8), size); + _glyph_ptr[size][GB(key, 8, 8)] = calloc(256, sizeof(***_glyph_ptr)); + } + + DEBUG(freetype, 4) ("[FreeType] Set glyph for unicode character 0x%04X, size %u", key, size); + _glyph_ptr[size][GB(key, 8, 8)][GB(key, 0, 8)].sprite = glyph->sprite; + _glyph_ptr[size][GB(key, 8, 8)][GB(key, 0, 8)].width = glyph->width; +} + + +const Sprite *GetGlyph(FontSize size, WChar key) +{ + FT_Face face = GetFontFace(size); + FT_GlyphSlot slot; + GlyphEntry new_glyph; + GlyphEntry *glyph; + Sprite *sprite; + int width; + int height; + int x; + int y; + int y_adj; + + assert(IsPrintable(key)); + + /* Bail out if no face loaded, or for our special characters */ + if (face == NULL || (key >= SCC_SPRITE_START && key <= SCC_SPRITE_END)) { + SpriteID sprite = GetUnicodeGlyph(size, key); + if (sprite == 0) sprite = GetUnicodeGlyph(size, '?'); + return GetSprite(sprite); + } + + /* Check for the glyph in our cache */ + glyph = GetGlyphPtr(size, key); + if (glyph != NULL && glyph->sprite != NULL) return glyph->sprite; + + slot = face->glyph; + + FT_Load_Char(face, key, FT_LOAD_DEFAULT); + FT_Render_Glyph(face->glyph, FT_RENDER_MODE_MONO); + + /* Add 1 pixel for the shadow on the medium font. Our sprite must be at least 1x1 pixel */ + width = max(1, slot->bitmap.width + (size == FS_NORMAL)); + height = max(1, slot->bitmap.rows + (size == FS_NORMAL)); + + /* FreeType has rendered the glyph, now we allocate a sprite and copy the image into it */ + sprite = calloc(width * height + 8, 1); + sprite->info = 1; + sprite->width = width; + sprite->height = height; + sprite->x_offs = slot->bitmap_left; + // XXX 2 should be determined somehow... it's right for the normal face + y_adj = (size == FS_NORMAL) ? 2 : 0; + sprite->y_offs = GetCharacterHeight(size) - slot->bitmap_top - y_adj; + + /* Draw shadow for medium size */ + if (size == FS_NORMAL) { + for (y = 0; y < slot->bitmap.rows; y++) { + for (x = 0; x < slot->bitmap.width; x++) { + if (HASBIT(slot->bitmap.buffer[(x / 8) + y * slot->bitmap.pitch], 7 - (x % 8))) { + sprite->data[1 + x + (1 + y) * sprite->width] = SHADOW_COLOUR; + } + } + } + } + + for (y = 0; y < slot->bitmap.rows; y++) { + for (x = 0; x < slot->bitmap.width; x++) { + if (HASBIT(slot->bitmap.buffer[(x / 8) + y * slot->bitmap.pitch], 7 - (x % 8))) { + sprite->data[x + y * sprite->width] = FACE_COLOUR; + } + } + } + + new_glyph.sprite = sprite; + new_glyph.width = (slot->advance.x >> 6) + (size != FS_NORMAL); + + SetGlyphPtr(size, key, &new_glyph); + + return sprite; +} + + +uint GetGlyphWidth(FontSize size, WChar key) +{ + FT_Face face = GetFontFace(size); + GlyphEntry *glyph; + + if (face == NULL || (key >= SCC_SPRITE_START && key <= SCC_SPRITE_END)) { + SpriteID sprite = GetUnicodeGlyph(size, key); + if (sprite == 0) sprite = GetUnicodeGlyph(size, '?'); + return SpriteExists(sprite) ? GetSprite(sprite)->width + (size != FS_NORMAL) : 0; + } + + glyph = GetGlyphPtr(size, key); + if (glyph == NULL || glyph->sprite == NULL) { + GetGlyph(size, key); + glyph = GetGlyphPtr(size, key); + } + + return glyph->width; +} + + +#endif /* WITH_FREETYPE */ + +/* Sprite based glyph mapping */ + +#include "table/unicode.h" + +static SpriteID **_unicode_glyph_map[FS_END]; + + +/** Get the SpriteID of the first glyph for the given font size */ +static SpriteID GetFontBase(FontSize size) +{ + switch (size) { + default: NOT_REACHED(); + case FS_NORMAL: return SPR_ASCII_SPACE; + case FS_SMALL: return SPR_ASCII_SPACE_SMALL; + case FS_LARGE: return SPR_ASCII_SPACE_BIG; + } +} + + +SpriteID GetUnicodeGlyph(FontSize size, uint32 key) +{ + if (_unicode_glyph_map[size][GB(key, 8, 8)] == NULL) return 0; + return _unicode_glyph_map[size][GB(key, 8, 8)][GB(key, 0, 8)]; +} + + +void SetUnicodeGlyph(FontSize size, uint32 key, SpriteID sprite) +{ + if (_unicode_glyph_map[size] == NULL) _unicode_glyph_map[size] = calloc(256, sizeof(*_unicode_glyph_map[size])); + if (_unicode_glyph_map[size][GB(key, 8, 8)] == NULL) _unicode_glyph_map[size][GB(key, 8, 8)] = calloc(256, sizeof(**_unicode_glyph_map[size])); + _unicode_glyph_map[size][GB(key, 8, 8)][GB(key, 0, 8)] = sprite; +} + + +void InitializeUnicodeGlyphMap(void) +{ + FontSize size; + SpriteID base; + SpriteID sprite; + uint i; + + for (size = FS_NORMAL; size != FS_END; size++) { + base = GetFontBase(size); + for (i = ASCII_LETTERSTART; i < 256; i++) { + sprite = base + i - ASCII_LETTERSTART; + if (!SpriteExists(sprite)) continue; + SetUnicodeGlyph(size, i, sprite); + SetUnicodeGlyph(size, i + SCC_SPRITE_START, sprite); + } + for (i = 0; i < lengthof(_default_unicode_map); i++) { + sprite = base + _default_unicode_map[i].key - ASCII_LETTERSTART; + SetUnicodeGlyph(size, _default_unicode_map[i].code, sprite); + } + } +} + |