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kc3-lang/ftgl/src/FTFont/FTBufferFont.cpp
sammy
- src/FTFont/FTBufferFont.cpp
-
/* * FTGL - OpenGL font library * * Copyright (c) 2008 Sam Hocevar <sam@hocevar.net> * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be * included in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include "config.h" #include <wchar.h> #include "FTGL/ftgl.h" #include "FTInternals.h" #include "FTBufferFontImpl.h" // // FTBufferFont // FTBufferFont::FTBufferFont(char const *fontFilePath) : FTFont(new FTBufferFontImpl(this, fontFilePath)) {} FTBufferFont::FTBufferFont(unsigned char const *pBufferBytes, size_t bufferSizeInBytes) : FTFont(new FTBufferFontImpl(this, pBufferBytes, bufferSizeInBytes)) {} FTBufferFont::~FTBufferFont() {} FTGlyph* FTBufferFont::MakeGlyph(FT_GlyphSlot ftGlyph) { FTBufferFontImpl *myimpl = dynamic_cast<FTBufferFontImpl *>(impl); if(!myimpl) { return NULL; } return myimpl->MakeGlyphImpl(ftGlyph); } // // FTBufferFontImpl // FTBufferFontImpl::FTBufferFontImpl(FTFont *ftFont, const char* fontFilePath) : FTFontImpl(ftFont, fontFilePath), buffer(new FTBuffer()) { load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP; glGenTextures(BUFFER_CACHE_SIZE, idCache); for(int i = 0; i < BUFFER_CACHE_SIZE; i++) { stringCache[i] = NULL; glBindTexture(GL_TEXTURE_2D, idCache[i]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); } lastString = 0; } FTBufferFontImpl::FTBufferFontImpl(FTFont *ftFont, const unsigned char *pBufferBytes, size_t bufferSizeInBytes) : FTFontImpl(ftFont, pBufferBytes, bufferSizeInBytes), buffer(new FTBuffer()) { load_flags = FT_LOAD_NO_HINTING | FT_LOAD_NO_BITMAP; glGenTextures(BUFFER_CACHE_SIZE, idCache); for(int i = 0; i < BUFFER_CACHE_SIZE; i++) { stringCache[i] = NULL; glBindTexture(GL_TEXTURE_2D, idCache[i]); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); } lastString = 0; } FTBufferFontImpl::~FTBufferFontImpl() { glDeleteTextures(BUFFER_CACHE_SIZE, idCache); for(int i = 0; i < BUFFER_CACHE_SIZE; i++) { if(stringCache[i]) { free(stringCache[i]); } } delete buffer; } FTGlyph* FTBufferFontImpl::MakeGlyphImpl(FT_GlyphSlot ftGlyph) { return new FTBufferGlyph(ftGlyph, buffer); } bool FTBufferFontImpl::FaceSize(const unsigned int size, const unsigned int res) { for(int i = 0; i < BUFFER_CACHE_SIZE; i++) { if(stringCache[i]) { free(stringCache[i]); stringCache[i] = NULL; } } return FTFontImpl::FaceSize(size, res); } static inline GLuint NextPowerOf2(GLuint in) { in -= 1; in |= in >> 16; in |= in >> 8; in |= in >> 4; in |= in >> 2; in |= in >> 1; return in + 1; } inline int StringCompare(void const *a, char const *b, int len) { return len < 0 ? strcmp((char const *)a, b) : strncmp((char const *)a, b, len); } inline int StringCompare(void const *a, wchar_t const *b, int len) { return len < 0 ? wcscmp((wchar_t const *)a, b) : wcsncmp((wchar_t const *)a, b, len); } inline char *StringCopy(char const *s, int len) { if(len < 0) { return strdup(s); } else { #ifdef HAVE_STRNDUP return strndup(s, len); #else char *s2 = (char*)malloc(len + 1); memcpy(s2, s, len); s2[len] = 0; return s2; #endif } } inline wchar_t *StringCopy(wchar_t const *s, int len) { if(len < 0) { #if defined HAVE_WCSDUP return wcsdup(s); #else len = (int)wcslen(s); #endif } wchar_t *s2 = (wchar_t *)malloc((len + 1) * sizeof(wchar_t)); memcpy(s2, s, len * sizeof(wchar_t)); s2[len] = 0; return s2; } template <typename T> inline FTPoint FTBufferFontImpl::RenderI(const T* string, const int len, FTPoint position, FTPoint spacing, int renderMode) { const float padding = 3.0f; int width, height, texWidth, texHeight; int cacheIndex = -1; bool inCache = false; // Protect blending functions and GL_TEXTURE_2D glPushAttrib(GL_COLOR_BUFFER_BIT | GL_ENABLE_BIT); // Protect glPixelStorei() calls glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT); glEnable(GL_TEXTURE_2D); // Search whether the string is already in a texture we uploaded for(int n = 0; n < BUFFER_CACHE_SIZE; n++) { int i = (lastString + n + BUFFER_CACHE_SIZE) % BUFFER_CACHE_SIZE; if(stringCache[i] && !StringCompare(stringCache[i], string, len)) { cacheIndex = i; inCache = true; break; } } // If the string was not found, we need to put it in the cache and compute // its new bounding box. if(!inCache) { // FIXME: this cache is not very efficient. We should first expire // strings that are not used very often. cacheIndex = lastString; lastString = (lastString + 1) % BUFFER_CACHE_SIZE; if(stringCache[cacheIndex]) { free(stringCache[cacheIndex]); } // FIXME: only the first N bytes are copied; we want the first N chars. stringCache[cacheIndex] = StringCopy(string, len); bboxCache[cacheIndex] = BBox(string, len, FTPoint(), spacing); } FTBBox bbox = bboxCache[cacheIndex]; width = static_cast<int>(bbox.Upper().X() - bbox.Lower().X() + padding + padding + 0.5); height = static_cast<int>(bbox.Upper().Y() - bbox.Lower().Y() + padding + padding + 0.5); texWidth = NextPowerOf2(width); texHeight = NextPowerOf2(height); glBindTexture(GL_TEXTURE_2D, idCache[cacheIndex]); // If the string was not found, we need to render the text in a new // texture buffer, then upload it to the OpenGL layer. if(!inCache) { buffer->Size(texWidth, texHeight); buffer->Pos(FTPoint(padding, padding) - bbox.Lower()); advanceCache[cacheIndex] = FTFontImpl::Render(string, len, FTPoint(), spacing, renderMode); glBindTexture(GL_TEXTURE_2D, idCache[cacheIndex]); glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE); glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); /* TODO: use glTexSubImage2D later? */ glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, texWidth, texHeight, 0, GL_ALPHA, GL_UNSIGNED_BYTE, (GLvoid *)buffer->Pixels()); buffer->Size(0, 0); } FTPoint low = position + bbox.Lower(); FTPoint up = position + bbox.Upper(); glBegin(GL_QUADS); glNormal3f(0.0f, 0.0f, 1.0f); glTexCoord2f(padding / texWidth, (texHeight - height + padding) / texHeight); glVertex2f(low.Xf(), up.Yf()); glTexCoord2f(padding / texWidth, (texHeight - padding) / texHeight); glVertex2f(low.Xf(), low.Yf()); glTexCoord2f((width - padding) / texWidth, (texHeight - padding) / texHeight); glVertex2f(up.Xf(), low.Yf()); glTexCoord2f((width - padding) / texWidth, (texHeight - height + padding) / texHeight); glVertex2f(up.Xf(), up.Yf()); glEnd(); glPopClientAttrib(); glPopAttrib(); return position + advanceCache[cacheIndex]; } FTPoint FTBufferFontImpl::Render(const char * string, const int len, FTPoint position, FTPoint spacing, int renderMode) { return RenderI(string, len, position, spacing, renderMode); } FTPoint FTBufferFontImpl::Render(const wchar_t * string, const int len, FTPoint position, FTPoint spacing, int renderMode) { return RenderI(string, len, position, spacing, renderMode); }