diff options
Diffstat (limited to 'libs/rs/rsFont.h')
| -rw-r--r-- | libs/rs/rsFont.h | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/libs/rs/rsFont.h b/libs/rs/rsFont.h new file mode 100644 index 0000000..e1a957a --- /dev/null +++ b/libs/rs/rsFont.h @@ -0,0 +1,207 @@ +/* + * Copyright (C) 2009 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#ifndef ANDROID_RS_FONT_H +#define ANDROID_RS_FONT_H + +#include "RenderScript.h" +#include "rsStream.h" +#include <utils/String8.h> +#include <utils/Vector.h> +#include <utils/KeyedVector.h> + +#include <ft2build.h> +#include FT_FREETYPE_H + +// --------------------------------------------------------------------------- +namespace android { + +namespace renderscript { + +class FontState; + +class Font : public ObjectBase +{ +public: + ~Font(); + + // Pointer to the utf data, length of data, where to start, number of glyphs ot read + // (each glyph may be longer than a char because we are dealing with utf data) + // Last two variables are the initial pen position + void renderUTF(const char *text, uint32_t len, uint32_t start, int numGlyphs, int x, int y); + + // Currently files do not get serialized, + // but we need to inherit from ObjectBase for ref tracking + virtual void serialize(OStream *stream) const { + } + virtual RsA3DClassID getClassId() const { + return RS_A3D_CLASS_ID_UNKNOWN; + } + + static Font * create(Context *rsc, const char *name, uint32_t fontSize, uint32_t dpi); + +protected: + + friend class FontState; + + void invalidateTextureCache(); + struct CachedGlyphInfo + { + // Has the cache been invalidated? + bool mIsValid; + // Location of the cached glyph in the bitmap + // in case we need to resize the texture + uint32_t mBitmapMinX; + uint32_t mBitmapMinY; + uint32_t mBitmapWidth; + uint32_t mBitmapHeight; + // Also cache texture coords for the quad + float mBitmapMinU; + float mBitmapMinV; + float mBitmapMaxU; + float mBitmapMaxV; + // Minimize how much we call freetype + FT_UInt mGlyphIndex; + FT_Vector mAdvance; + // Values below contain a glyph's origin in the bitmap + FT_Int mBitmapLeft; + FT_Int mBitmapTop; + }; + + String8 mFontName; + uint32_t mFontSize; + uint32_t mDpi; + + Font(Context *rsc); + bool init(const char *name, uint32_t fontSize, uint32_t dpi); + + FT_Face mFace; + bool mInitialized; + bool mHasKerning; + + DefaultKeyedVector<uint32_t, CachedGlyphInfo* > mCachedGlyphs; + + CachedGlyphInfo *cacheGlyph(uint32_t glyph); + void updateGlyphCache(CachedGlyphInfo *glyph); + void drawCachedGlyph(CachedGlyphInfo *glyph, int x, int y); +}; + +class FontState +{ +public: + FontState(); + ~FontState(); + + void init(Context *rsc); + void deinit(Context *rsc); + + ObjectBaseRef<Font> mDefault; + ObjectBaseRef<Font> mLast; + + void renderText(const char *text, uint32_t len, uint32_t startIndex, int numGlyphs, int x, int y); + void renderText(const char *text, int x, int y); + void renderText(Allocation *alloc, int x, int y); + void renderText(Allocation *alloc, uint32_t start, int len, int x, int y); + +protected: + + friend class Font; + + struct CacheTextureLine + { + uint32_t mMaxHeight; + uint32_t mMaxWidth; + uint32_t mCurrentRow; + uint32_t mCurrentCol; + + CacheTextureLine(uint32_t maxHeight, uint32_t maxWidth, uint32_t currentRow, uint32_t currentCol) : + mMaxHeight(maxHeight), mMaxWidth(maxWidth), mCurrentRow(currentRow), mCurrentCol(currentCol) { + } + + bool fitBitmap(FT_Bitmap *bitmap, uint32_t *retOriginX, uint32_t *retOriginY) { + if((uint32_t)bitmap->rows > mMaxHeight) { + return false; + } + + if(mCurrentCol + (uint32_t)bitmap->width < mMaxWidth) { + *retOriginX = mCurrentCol; + *retOriginY = mCurrentRow; + mCurrentCol += bitmap->width; + return true; + } + + return false; + } + }; + + Vector<CacheTextureLine*> mCacheLines; + + Context *mRSC; + + // Free type library, we only need one copy + FT_Library mLibrary; + FT_Library getLib(); + Vector<Font*> mActiveFonts; + + // Render state for the font + ObjectBaseRef<ProgramFragment> mFontShaderF; + ObjectBaseRef<Sampler> mFontSampler; + ObjectBaseRef<ProgramStore> mFontProgramStore; + void initRenderState(); + + // Texture to cache glyph bitmaps + ObjectBaseRef<Allocation> mTextTexture; + void initTextTexture(); + + bool cacheBitmap(FT_Bitmap *bitmap, uint32_t *retOriginX, uint32_t *retOriginY); + const Type* getCacheTextureType() { + return mTextTexture->getType(); + } + + void flushAllAndInvalidate(); + + // Pointer to vertex data to speed up frame to frame work + float *mTextMeshPtr; + uint32_t mCurrentQuadIndex; + uint32_t mMaxNumberOfQuads; + + void initVertexArrayBuffers(); + ObjectBaseRef<Allocation> mIndexBuffer; + ObjectBaseRef<Allocation> mVertexArray; + + + bool mInitialized; + + void checkInit(); + + void issueDrawCommand(); + + void appendMeshQuad(float x1, float y1, float z1, + float u1, float v1, + float x2, float y2, float z2, + float u2, float v2, + float x3, float y3, float z3, + float u3, float v3, + float x4, float y4, float z4, + float u4, float v4); + +}; + + +} +} + +#endif |