rsFont.h revision a74a8f635ce4fae0a9d4b9c79e9fa412787bf6a2
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 26struct FT_LibraryRec_; 27struct FT_FaceRec_; 28struct FT_Bitmap_; 29 30// --------------------------------------------------------------------------- 31namespace android { 32 33namespace renderscript { 34 35// Gamma (>= 1.0, <= 10.0) 36#define PROPERTY_TEXT_GAMMA "ro.text_gamma" 37#define PROPERTY_TEXT_BLACK_GAMMA_THRESHOLD "ro.text_gamma.black_threshold" 38#define PROPERTY_TEXT_WHITE_GAMMA_THRESHOLD "ro.text_gamma.white_threshold" 39 40#define DEFAULT_TEXT_GAMMA 1.4f 41#define DEFAULT_TEXT_BLACK_GAMMA_THRESHOLD 64 42#define DEFAULT_TEXT_WHITE_GAMMA_THRESHOLD 192 43 44class FontState; 45 46class Font : public ObjectBase { 47public: 48 enum RenderMode { 49 FRAMEBUFFER, 50 BITMAP, 51 MEASURE, 52 }; 53 54 struct Rect { 55 int32_t left; 56 int32_t top; 57 int32_t right; 58 int32_t bottom; 59 void set(int32_t l, int32_t r, int32_t t, int32_t b) { 60 left = l; 61 right = r; 62 top = t; 63 bottom = b; 64 } 65 }; 66 67 ~Font(); 68 69 // Currently files do not get serialized, 70 // but we need to inherit from ObjectBase for ref tracking 71 virtual void serialize(OStream *stream) const { 72 } 73 virtual RsA3DClassID getClassId() const { 74 return RS_A3D_CLASS_ID_UNKNOWN; 75 } 76 77 static Font * create(Context *rsc, const char *name, float fontSize, uint32_t dpi, 78 const void *data = NULL, uint32_t dataLen = 0); 79 80protected: 81 82 friend class FontState; 83 84 // Pointer to the utf data, length of data, where to start, number of glyphs ot read 85 // (each glyph may be longer than a char because we are dealing with utf data) 86 // Last two variables are the initial pen position 87 void renderUTF(const char *text, uint32_t len, int32_t x, int32_t y, 88 uint32_t start, int32_t numGlyphs, 89 RenderMode mode = FRAMEBUFFER, Rect *bounds = NULL, 90 uint8_t *bitmap = NULL, uint32_t bitmapW = 0, uint32_t bitmapH = 0); 91 92 void invalidateTextureCache(); 93 struct CachedGlyphInfo 94 { 95 // Has the cache been invalidated? 96 bool mIsValid; 97 // Location of the cached glyph in the bitmap 98 // in case we need to resize the texture 99 uint32_t mBitmapMinX; 100 uint32_t mBitmapMinY; 101 uint32_t mBitmapWidth; 102 uint32_t mBitmapHeight; 103 // Also cache texture coords for the quad 104 float mBitmapMinU; 105 float mBitmapMinV; 106 float mBitmapMaxU; 107 float mBitmapMaxV; 108 // Minimize how much we call freetype 109 int32_t mGlyphIndex; 110 int32_t mAdvanceX; 111 int32_t mAdvanceY; 112 // Values below contain a glyph's origin in the bitmap 113 int32_t mBitmapLeft; 114 int32_t mBitmapTop; 115 }; 116 117 String8 mFontName; 118 float mFontSize; 119 uint32_t mDpi; 120 121 Font(Context *rsc); 122 bool init(const char *name, float fontSize, uint32_t dpi, const void *data = NULL, uint32_t dataLen = 0); 123 124 virtual void preDestroy() const; 125 FT_FaceRec_ *mFace; 126 bool mInitialized; 127 bool mHasKerning; 128 129 DefaultKeyedVector<uint32_t, CachedGlyphInfo* > mCachedGlyphs; 130 CachedGlyphInfo* getCachedUTFChar(int32_t utfChar); 131 132 CachedGlyphInfo *cacheGlyph(uint32_t glyph); 133 void updateGlyphCache(CachedGlyphInfo *glyph); 134 void measureCachedGlyph(CachedGlyphInfo *glyph, int32_t x, int32_t y, Rect *bounds); 135 void drawCachedGlyph(CachedGlyphInfo *glyph, int32_t x, int32_t y); 136 void drawCachedGlyph(CachedGlyphInfo *glyph, int32_t x, int32_t y, 137 uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH); 138}; 139 140class FontState { 141public: 142 FontState(); 143 ~FontState(); 144 145 void init(Context *rsc); 146 void deinit(Context *rsc); 147 148 ObjectBaseRef<Font> mDefault; 149 150 void renderText(const char *text, uint32_t len, int32_t x, int32_t y, 151 uint32_t startIndex = 0, int numGlyphs = -1, 152 Font::RenderMode mode = Font::FRAMEBUFFER, 153 Font::Rect *bounds = NULL, 154 uint8_t *bitmap = NULL, uint32_t bitmapW = 0, uint32_t bitmapH = 0); 155 156 void measureText(const char *text, uint32_t len, Font::Rect *bounds); 157 158 void setFontColor(float r, float g, float b, float a); 159 void getFontColor(float *r, float *g, float *b, float *a) const; 160 161protected: 162 163 float mSurfaceWidth; 164 float mSurfaceHeight; 165 166 friend class Font; 167 168 struct CacheTextureLine { 169 uint32_t mMaxHeight; 170 uint32_t mMaxWidth; 171 uint32_t mCurrentRow; 172 uint32_t mCurrentCol; 173 bool mDirty; 174 175 CacheTextureLine(uint32_t maxHeight, uint32_t maxWidth, uint32_t currentRow, uint32_t currentCol) 176 : mMaxHeight(maxHeight), mMaxWidth(maxWidth), mCurrentRow(currentRow), 177 mCurrentCol(currentCol), mDirty(false) { 178 } 179 180 bool fitBitmap(FT_Bitmap_ *bitmap, uint32_t *retOriginX, uint32_t *retOriginY); 181 }; 182 183 Vector<CacheTextureLine*> mCacheLines; 184 uint32_t getRemainingCacheCapacity(); 185 186 void precacheLatin(Font *font); 187 String8 mLatinPrecache; 188 189 Context *mRSC; 190 191 struct { 192 float mFontColor[4]; 193 float mGamma; 194 } mConstants; 195 bool mConstantsDirty; 196 197 float mBlackGamma; 198 float mWhiteGamma; 199 200 float mBlackThreshold; 201 float mWhiteThreshold; 202 203 // Free type library, we only need one copy 204#ifndef ANDROID_RS_SERIALIZE 205 FT_LibraryRec_ *mLibrary; 206 FT_LibraryRec_ *getLib(); 207#endif //ANDROID_RS_SERIALIZE 208 Vector<Font*> mActiveFonts; 209 210 // Render state for the font 211 ObjectBaseRef<Allocation> mFontShaderFConstant; 212 ObjectBaseRef<ProgramFragment> mFontShaderF; 213 ObjectBaseRef<Sampler> mFontSampler; 214 ObjectBaseRef<ProgramStore> mFontProgramStore; 215 void initRenderState(); 216 217 // Texture to cache glyph bitmaps 218 ObjectBaseRef<Allocation> mTextTexture; 219 void initTextTexture(); 220 const uint8_t* getTextTextureData() const { 221 return (uint8_t*)mTextTexture->getPtr(); 222 } 223 224#ifndef ANDROID_RS_SERIALIZE 225 bool cacheBitmap(FT_Bitmap_ *bitmap, uint32_t *retOriginX, uint32_t *retOriginY); 226#endif //ANDROID_RS_SERIALIZE 227 const Type* getCacheTextureType() { 228 return mTextTexture->getType(); 229 } 230 231 void flushAllAndInvalidate(); 232 233 // Pointer to vertex data to speed up frame to frame work 234 float *mTextMeshPtr; 235 uint32_t mCurrentQuadIndex; 236 uint32_t mMaxNumberOfQuads; 237 238 void initVertexArrayBuffers(); 239 ObjectBaseRef<Mesh> mMesh; 240 241 bool mInitialized; 242 243 void checkInit(); 244 245 void issueDrawCommand(); 246 247 void appendMeshQuad(float x1, float y1, float z1, 248 float u1, float v1, 249 float x2, float y2, float z2, 250 float u2, float v2, 251 float x3, float y3, float z3, 252 float u3, float v3, 253 float x4, float y4, float z4, 254 float u4, float v4); 255}; 256 257} 258} 259 260#endif 261