Enable large font rendering with GPU acceleration (44984ea0) · Commits · e / os / android_frameworks_base

libs/hwui/FontRenderer.cpp

+34 −5

Original line number	Diff line number	Diff line
		@@ -35,6 +35,9 @@ namespace uirenderer {
		#define DEFAULT_TEXT_CACHE_WIDTH 1024
		#define DEFAULT_TEXT_CACHE_HEIGHT 256

		#define MAX_TEXT_CACHE_WIDTH 2048
		#define MAX_TEXT_CACHE_HEIGHT 2048

		///////////////////////////////////////////////////////////////////////////////
		// Font
		///////////////////////////////////////////////////////////////////////////////
		@@ -385,11 +388,19 @@ void FontRenderer::flushAllAndInvalidate() {

		bool FontRenderer::cacheBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint32_t* retOriginY) {
		// If the glyph is too tall, don't cache it
		if (glyph.fHeight > mCacheLines[mCacheLines.size() - 1]->mMaxHeight) {
		if (mCacheHeight < MAX_TEXT_CACHE_HEIGHT) {
		// Default cache not large enough for large glyphs - resize cache to
		// max size and try again
		flushAllAndInvalidate();
		initTextTexture(true);
		}
		if (glyph.fHeight > mCacheLines[mCacheLines.size() - 1]->mMaxHeight) {
		LOGE("Font size to large to fit in cache. width, height = %i, %i",
		(int) glyph.fWidth, (int) glyph.fHeight);
		return false;
		}
		}

		// Now copy the bitmap into the cache texture
		uint32_t startX = 0;
		@@ -446,16 +457,25 @@ bool FontRenderer::cacheBitmap(const SkGlyph& glyph, uint32_t* retOriginX, uint3
		return true;
		}

		void FontRenderer::initTextTexture() {
		void FontRenderer::initTextTexture(bool largeFonts) {
		mCacheLines.clear();
		if (largeFonts) {
		mCacheWidth = MAX_TEXT_CACHE_WIDTH;
		mCacheHeight = MAX_TEXT_CACHE_HEIGHT;
		}

		mTextTexture = new uint8_t[mCacheWidth * mCacheHeight];
		memset(mTextTexture, 0, mCacheWidth * mCacheHeight * sizeof(uint8_t));

		mUploadTexture = false;

		if (mTextureId != 0) {
		glDeleteTextures(1, &mTextureId);
		}
		glGenTextures(1, &mTextureId);
		glBindTexture(GL_TEXTURE_2D, mTextureId);
		glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
		// Initialize texture dimentions
		// Initialize texture dimensions
		glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, mCacheWidth, mCacheHeight, 0,
		GL_ALPHA, GL_UNSIGNED_BYTE, 0);

		@@ -480,6 +500,15 @@ void FontRenderer::initTextTexture() {
		nextLine += mCacheLines.top()->mMaxHeight;
		mCacheLines.push(new CacheTextureLine(mCacheWidth, 42, nextLine, 0));
		nextLine += mCacheLines.top()->mMaxHeight;
		if (largeFonts) {
		int nextSize = 76;
		// Make several new lines with increasing font sizes
		while (nextSize < (int)(mCacheHeight - nextLine - (2 * nextSize))) {
		mCacheLines.push(new CacheTextureLine(mCacheWidth, nextSize, nextLine, 0));
		nextLine += mCacheLines.top()->mMaxHeight;
		nextSize += 50;
		}
		}
		mCacheLines.push(new CacheTextureLine(mCacheWidth, mCacheHeight - nextLine, nextLine, 0));
		}

libs/hwui/FontRenderer.h

+1 −1

Original line number	Diff line number	Diff line
		@@ -229,7 +229,7 @@ protected:
		}
		};

		void initTextTexture();
		void initTextTexture(bool largeFonts = false);
		bool cacheBitmap(const SkGlyph& glyph, uint32_t retOriginX, uint32_t retOriginY);

		void flushAllAndInvalidate();

tests/HwAccelerationTest/src/com/android/test/hwui/TextActivity.java

+12 −3

Original line number	Diff line number	Diff line
		@@ -38,6 +38,7 @@ public class TextActivity extends Activity {
		private final Paint mStrikePaint;
		private final Paint mScaledPaint;
		private final Paint mSkewPaint;
		private final Paint mHugePaint;

		CustomTextView(Context c) {
		super(c);
		@@ -64,6 +65,11 @@ public class TextActivity extends Activity {
		mSkewPaint.setAntiAlias(true);
		mSkewPaint.setTextSize(16.0f);
		mSkewPaint.setShadowLayer(3.0f, 3.0f, 3.0f, 0xff000000);

		mHugePaint = new Paint();
		mHugePaint.setAntiAlias(true);
		mHugePaint.setColor(0xff000000);
		mHugePaint.setTextSize(300f);
		}

		@Override
		@@ -99,6 +105,8 @@ public class TextActivity extends Activity {
		mLargePaint.setColor(0xff000000);
		mLargePaint.clearShadowLayer();

		canvas.drawText("Hello!", 500, 600, mHugePaint);

		canvas.drawText("Hello OpenGL renderer!", 500, 40, mStrikePaint);
		mStrikePaint.setStrikeThruText(true);
		canvas.drawText("Hello OpenGL renderer!", 500, 70, mStrikePaint);
		@@ -125,6 +133,7 @@ public class TextActivity extends Activity {
		canvas.clipRect(150.0f, 220.0f, 450.0f, 320.0f);
		canvas.drawText("Hello OpenGL renderer!", 100, 300, mLargePaint);
		canvas.restore();

		}
		}
		}