Reduce number of glDraw calls when drawing text
This change moves the mesh buffer from FontRenderer to CacheTexture
to help reduce the number of texture binds and glDraw calls when
drawing text that spans across multiple textures.
Change-Id: I7de574d88313ca3672879ca878c253ff5f131fc1
diff --git a/libs/hwui/font/CacheTexture.cpp b/libs/hwui/font/CacheTexture.cpp
index 24b0523..1096642 100644
--- a/libs/hwui/font/CacheTexture.cpp
+++ b/libs/hwui/font/CacheTexture.cpp
@@ -106,6 +106,84 @@
// CacheTexture
///////////////////////////////////////////////////////////////////////////////
+CacheTexture::CacheTexture(uint16_t width, uint16_t height, uint32_t maxQuadCount) :
+ mTexture(NULL), mTextureId(0), mWidth(width), mHeight(height),
+ mLinearFiltering(false), mDirty(false), mNumGlyphs(0),
+ mMesh(NULL), mCurrentQuad(0), mMaxQuadCount(maxQuadCount) {
+ mCacheBlocks = new CacheBlock(TEXTURE_BORDER_SIZE, TEXTURE_BORDER_SIZE,
+ mWidth - TEXTURE_BORDER_SIZE, mHeight - TEXTURE_BORDER_SIZE, true);
+}
+
+CacheTexture::~CacheTexture() {
+ releaseMesh();
+ releaseTexture();
+ reset();
+}
+
+void CacheTexture::reset() {
+ // Delete existing cache blocks
+ while (mCacheBlocks != NULL) {
+ CacheBlock* tmpBlock = mCacheBlocks;
+ mCacheBlocks = mCacheBlocks->mNext;
+ delete tmpBlock;
+ }
+ mNumGlyphs = 0;
+ mCurrentQuad = 0;
+}
+
+void CacheTexture::init() {
+ // reset, then create a new remainder space to start again
+ reset();
+ mCacheBlocks = new CacheBlock(TEXTURE_BORDER_SIZE, TEXTURE_BORDER_SIZE,
+ mWidth - TEXTURE_BORDER_SIZE, mHeight - TEXTURE_BORDER_SIZE, true);
+}
+
+void CacheTexture::releaseMesh() {
+ delete[] mMesh;
+}
+
+void CacheTexture::releaseTexture() {
+ if (mTexture) {
+ delete[] mTexture;
+ mTexture = NULL;
+ }
+ if (mTextureId) {
+ glDeleteTextures(1, &mTextureId);
+ mTextureId = 0;
+ }
+ mDirty = false;
+ mCurrentQuad = 0;
+}
+
+void CacheTexture::allocateMesh() {
+ if (!mMesh) {
+ mMesh = new TextureVertex[mMaxQuadCount * 4];
+ }
+}
+
+void CacheTexture::allocateTexture() {
+ if (!mTexture) {
+ mTexture = new uint8_t[mWidth * mHeight];
+ }
+
+ if (!mTextureId) {
+ glGenTextures(1, &mTextureId);
+
+ glBindTexture(GL_TEXTURE_2D, mTextureId);
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ // Initialize texture dimensions
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, mWidth, mHeight, 0,
+ GL_ALPHA, GL_UNSIGNED_BYTE, 0);
+
+ const GLenum filtering = getLinearFiltering() ? GL_LINEAR : GL_NEAREST;
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filtering);
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+ }
+}
+
bool CacheTexture::fitBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY) {
if (glyph.fHeight + TEXTURE_BORDER_SIZE * 2 > mHeight) {
return false;