Updating parts of font cache as needed instead of the entire map. (9b9902dd) · Commits · e / os / android_frameworks_base

libs/hwui/FontRenderer.cpp

+41 −10

Original line number	Diff line number	Diff line
		@@ -199,11 +199,12 @@ FontRenderer::FontRenderer() {
		mInitialized = false;
		mMaxNumberOfQuads = 1024;
		mCurrentQuadIndex = 0;
		mTextureId = 0;

		mIndexBufferID = 0;

		mCacheWidth = DEFAULT_TEXT_CACHE_WIDTH;
		mCacheHeight = DEFAULT_TEXT_CACHE_WIDTH;
		mCacheHeight = DEFAULT_TEXT_CACHE_HEIGHT;

		char property[PROPERTY_VALUE_MAX];
		if (property_get(PROPERTY_TEXT_CACHE_WIDTH, property, NULL) > 0) {
		@@ -227,7 +228,12 @@ FontRenderer::~FontRenderer() {
		}
		mCacheLines.clear();

		delete mTextMeshPtr;

		delete mTextTexture;
		if(mTextureId) {
		glDeleteTextures(1, &mTextureId);
		}

		Vector<Font*> fontsToDereference = mActiveFonts;
		for (uint32_t i = 0; i < fontsToDereference.size(); i++) {
		@@ -318,6 +324,9 @@ void FontRenderer::initTextTexture() {
		glGenTextures(1, &mTextureId);
		glBindTexture(GL_TEXTURE_2D, mTextureId);
		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
		// Initialize texture dimentions
		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, mCacheWidth, mCacheHeight, 0,
		GL_ALPHA, GL_UNSIGNED_BYTE, 0);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
		@@ -370,9 +379,8 @@ void FontRenderer::initVertexArrayBuffers() {
		uint32_t coordSize = 3;
		uint32_t uvSize = 2;
		uint32_t vertsPerQuad = 4;
		uint32_t vertexBufferSizeBytes = mMaxNumberOfQuads * vertsPerQuad * coordSize *
		uvSize * sizeof(float);
		mTextMeshPtr = (float*) malloc(vertexBufferSizeBytes);
		uint32_t vertexBufferSize = mMaxNumberOfQuads * vertsPerQuad * coordSize * uvSize;
		mTextMeshPtr = new float[vertexBufferSize];
		}

		// We don't want to allocate anything unless we actually draw text
		@@ -387,14 +395,37 @@ void FontRenderer::checkInit() {
		mInitialized = true;
		}

		void FontRenderer::issueDrawCommand() {
		if (mUploadTexture) {
		void FontRenderer::checkTextureUpdate() {
		if (!mUploadTexture) {
		return;
		}

		glBindTexture(GL_TEXTURE_2D, mTextureId);
		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, mCacheWidth, mCacheHeight, 0, GL_ALPHA,
		GL_UNSIGNED_BYTE, mTextTexture);

		// Iterate over all the cache lines and see which ones need to be updated
		for (uint32_t i = 0; i < mCacheLines.size(); i++) {
		CacheTextureLine* cl = mCacheLines[i];
		if(cl->mDirty) {
		uint32_t xOffset = 0;
		uint32_t yOffset = cl->mCurrentRow;
		uint32_t width = mCacheWidth;
		uint32_t height = cl->mMaxHeight;
		void* textureData = mTextTexture + yOffset*width;

		glTexSubImage2D(GL_TEXTURE_2D, 0, xOffset, yOffset, width, height,
		GL_ALPHA, GL_UNSIGNED_BYTE, textureData);

		cl->mDirty = false;
		}
		}

		mUploadTexture = false;
		}

		void FontRenderer::issueDrawCommand() {

		checkTextureUpdate();

		float* vtx = mTextMeshPtr;
		float* tex = vtx + 3;

libs/hwui/FontRenderer.h

+5 −1

Original line number	Diff line number	Diff line
		@@ -116,13 +116,15 @@ protected:
		uint16_t mMaxWidth;
		uint32_t mCurrentRow;
		uint32_t mCurrentCol;
		bool mDirty;

		CacheTextureLine(uint16_t maxWidth, uint16_t maxHeight, uint32_t currentRow,
		uint32_t currentCol):
		mMaxHeight(maxHeight),
		mMaxWidth(maxWidth),
		mCurrentRow(currentRow),
		mCurrentCol(currentCol) {
		mCurrentCol(currentCol),
		mDirty(false) {
		}

		bool fitBitmap(const SkGlyph& glyph, uint32_t retOriginX, uint32_t retOriginY) {
		@@ -134,6 +136,7 @@ protected:
		*retOriginX = mCurrentCol;
		*retOriginY = mCurrentRow;
		mCurrentCol += glyph.fWidth;
		mDirty = true;
		return true;
		}

		@@ -173,6 +176,7 @@ protected:
		// Texture to cache glyph bitmaps
		unsigned char* mTextTexture;
		GLuint mTextureId;
		void checkTextureUpdate();
		bool mUploadTexture;

		// Pointer to vertex data to speed up frame to frame work