rsFont.h revision ca5a454e022caec6c6d3cbb404cc09ea095ba97a
1/* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_RS_FONT_H 18#define ANDROID_RS_FONT_H 19 20#include "RenderScript.h" 21#include "rsStream.h" 22#include <utils/String8.h> 23#include <utils/Vector.h> 24#include <utils/KeyedVector.h> 25 26#include <ft2build.h> 27#include FT_FREETYPE_H 28 29// --------------------------------------------------------------------------- 30namespace android { 31 32namespace renderscript { 33 34class FontState; 35 36class Font : public ObjectBase 37{ 38public: 39 ~Font(); 40 41 // Pointer to the utf data, length of data, where to start, number of glyphs ot read 42 // (each glyph may be longer than a char because we are dealing with utf data) 43 // Last two variables are the initial pen position 44 void renderUTF(const char *text, uint32_t len, uint32_t start, int numGlyphs, int x, int y); 45 46 // Currently files do not get serialized, 47 // but we need to inherit from ObjectBase for ref tracking 48 virtual void serialize(OStream *stream) const { 49 } 50 virtual RsA3DClassID getClassId() const { 51 return RS_A3D_CLASS_ID_UNKNOWN; 52 } 53 54 static Font * create(Context *rsc, const char *name, uint32_t fontSize, uint32_t dpi); 55 56protected: 57 58 friend class FontState; 59 60 void invalidateTextureCache(); 61 struct CachedGlyphInfo 62 { 63 // Has the cache been invalidated? 64 bool mIsValid; 65 // Location of the cached glyph in the bitmap 66 // in case we need to resize the texture 67 uint32_t mBitmapMinX; 68 uint32_t mBitmapMinY; 69 uint32_t mBitmapWidth; 70 uint32_t mBitmapHeight; 71 // Also cache texture coords for the quad 72 float mBitmapMinU; 73 float mBitmapMinV; 74 float mBitmapMaxU; 75 float mBitmapMaxV; 76 // Minimize how much we call freetype 77 FT_UInt mGlyphIndex; 78 FT_Vector mAdvance; 79 // Values below contain a glyph's origin in the bitmap 80 FT_Int mBitmapLeft; 81 FT_Int mBitmapTop; 82 }; 83 84 String8 mFontName; 85 uint32_t mFontSize; 86 uint32_t mDpi; 87 88 Font(Context *rsc); 89 bool init(const char *name, uint32_t fontSize, uint32_t dpi); 90 91 FT_Face mFace; 92 bool mInitialized; 93 bool mHasKerning; 94 95 DefaultKeyedVector<uint32_t, CachedGlyphInfo* > mCachedGlyphs; 96 97 CachedGlyphInfo *cacheGlyph(uint32_t glyph); 98 void updateGlyphCache(CachedGlyphInfo *glyph); 99 void drawCachedGlyph(CachedGlyphInfo *glyph, int x, int y); 100}; 101 102class FontState 103{ 104public: 105 FontState(); 106 ~FontState(); 107 108 void init(Context *rsc); 109 void deinit(Context *rsc); 110 111 ObjectBaseRef<Font> mDefault; 112 ObjectBaseRef<Font> mLast; 113 114 void renderText(const char *text, uint32_t len, uint32_t startIndex, int numGlyphs, int x, int y); 115 void renderText(const char *text, int x, int y); 116 void renderText(Allocation *alloc, int x, int y); 117 void renderText(Allocation *alloc, uint32_t start, int len, int x, int y); 118 119 void setFontColor(float r, float g, float b, float a); 120 void getFontColor(float *r, float *g, float *b, float *a) const; 121 122protected: 123 124 friend class Font; 125 126 struct CacheTextureLine 127 { 128 uint32_t mMaxHeight; 129 uint32_t mMaxWidth; 130 uint32_t mCurrentRow; 131 uint32_t mCurrentCol; 132 133 CacheTextureLine(uint32_t maxHeight, uint32_t maxWidth, uint32_t currentRow, uint32_t currentCol) : 134 mMaxHeight(maxHeight), mMaxWidth(maxWidth), mCurrentRow(currentRow), mCurrentCol(currentCol) { 135 } 136 137 bool fitBitmap(FT_Bitmap *bitmap, uint32_t *retOriginX, uint32_t *retOriginY) { 138 if((uint32_t)bitmap->rows > mMaxHeight) { 139 return false; 140 } 141 142 if(mCurrentCol + (uint32_t)bitmap->width < mMaxWidth) { 143 *retOriginX = mCurrentCol; 144 *retOriginY = mCurrentRow; 145 mCurrentCol += bitmap->width; 146 return true; 147 } 148 149 return false; 150 } 151 }; 152 153 Vector<CacheTextureLine*> mCacheLines; 154 155 Context *mRSC; 156 157 float mFontColor[4]; 158 bool mFontColorDirty; 159 160 // Free type library, we only need one copy 161 FT_Library mLibrary; 162 FT_Library getLib(); 163 Vector<Font*> mActiveFonts; 164 165 // Render state for the font 166 ObjectBaseRef<ProgramFragment> mFontShaderF; 167 ObjectBaseRef<Sampler> mFontSampler; 168 ObjectBaseRef<ProgramStore> mFontProgramStore; 169 void initRenderState(); 170 171 // Texture to cache glyph bitmaps 172 ObjectBaseRef<Allocation> mTextTexture; 173 void initTextTexture(); 174 175 bool cacheBitmap(FT_Bitmap *bitmap, uint32_t *retOriginX, uint32_t *retOriginY); 176 const Type* getCacheTextureType() { 177 return mTextTexture->getType(); 178 } 179 180 void flushAllAndInvalidate(); 181 182 // Pointer to vertex data to speed up frame to frame work 183 float *mTextMeshPtr; 184 uint32_t mCurrentQuadIndex; 185 uint32_t mMaxNumberOfQuads; 186 187 void initVertexArrayBuffers(); 188 ObjectBaseRef<Allocation> mIndexBuffer; 189 ObjectBaseRef<Allocation> mVertexArray; 190 191 192 bool mInitialized; 193 194 void checkInit(); 195 196 void issueDrawCommand(); 197 198 void appendMeshQuad(float x1, float y1, float z1, 199 float u1, float v1, 200 float x2, float y2, float z2, 201 float u2, float v2, 202 float x3, float y3, float z3, 203 float u3, float v3, 204 float x4, float y4, float z4, 205 float u4, float v4); 206 207}; 208 209 210} 211} 212 213#endif 214