Added drop shadow renderer to the font class. (f18136cb) · Commits · e / os / android_frameworks_base

libs/hwui/FontRenderer.cpp

+91 −18

Original line number	Diff line number	Diff line
		@@ -62,6 +62,27 @@ void Font::invalidateTextureCache() {
		}
		}

		void Font::measureCachedGlyph(CachedGlyphInfo glyph, int x, int y, Rect bounds) {
		int nPenX = x + glyph->mBitmapLeft;
		int nPenY = y + glyph->mBitmapTop;

		int width = (int) glyph->mBitmapWidth;
		int height = (int) glyph->mBitmapHeight;

		if(bounds->bottom > nPenY) {
		bounds->bottom = nPenY;
		}
		if(bounds->left > nPenX) {
		bounds->left = nPenX;
		}
		if(bounds->right < nPenX + width) {
		bounds->right = nPenX + width;
		}
		if(bounds->top < nPenY + height) {
		bounds->top = nPenY + height;
		}
		}

		void Font::drawCachedGlyph(CachedGlyphInfo* glyph, int x, int y) {
		int nPenX = x + glyph->mBitmapLeft;
		int nPenY = y + glyph->mBitmapTop + glyph->mBitmapHeight;
		@@ -88,22 +109,17 @@ void Font::drawCachedGlyph(CachedGlyphInfo *glyph, int x, int y,
		uint32_t endX = glyph->mStartX + glyph->mBitmapWidth;
		uint32_t endY = glyph->mStartY + glyph->mBitmapHeight;

		if(nPenX < 0 \|\| nPenY < 0) {
		LOGE("Cannot render into a bitmap, some of the glyph is below zero");
		return;
		}

		if(nPenX + glyph->mBitmapWidth >= bitmapW \|\| nPenY + glyph->mBitmapHeight >= bitmapH) {
		LOGE("Cannot render into a bitmap, dimentions too small");
		return;
		}

		uint32_t cacheWidth = mState->getCacheWidth();
		const uint8_t* cacheBuffer = mState->getTextTextureData();

		uint32_t cacheX = 0, bX = 0, cacheY = 0, bY = 0;
		uint32_t cacheX = 0, cacheY = 0;
		int32_t bX = 0, bY = 0;
		for (cacheX = glyph->mStartX, bX = nPenX; cacheX < endX; cacheX++, bX++) {
		for (cacheY = glyph->mStartY, bY = nPenY; cacheY < endY; cacheY++, bY++) {
		if(bX < 0 \|\| bY < 0 \|\| bX >= (int32_t)bitmapW \|\| bY >= (int32_t)bitmapH) {
		LOGE("Skipping invalid index");
		continue;
		}
		uint8_t tempCol = cacheBuffer[cacheY * cacheWidth + cacheX];
		bitmap[bY * bitmapW + bX] = tempCol;
		}
		@@ -127,7 +143,33 @@ Font::CachedGlyphInfo* Font::getCachedUTFChar(SkPaint* paint, int32_t utfChar) {
		}

		void Font::renderUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
		int numGlyphs, int x, int y, uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH) {
		int numGlyphs, int x, int y,
		uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH) {
		if(bitmap != NULL && bitmapW > 0 && bitmapH > 0) {
		renderUTF(paint, text, start, len, numGlyphs, x, y, BITMAP,
		bitmap, bitmapW, bitmapH, NULL);
		}
		else {
		renderUTF(paint, text, start, len, numGlyphs, x, y, FRAMEBUFFER,
		NULL, 0, 0, NULL);
		}

		}

		void Font::measureUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
		int numGlyphs, Rect *bounds) {
		if(bounds == NULL) {
		LOGE("No return rectangle provided to measure text");
		return;
		}
		bounds->set(1e6, -1e6, -1e6, 1e6);
		renderUTF(paint, text, start, len, numGlyphs, 0, 0, MEASURE, NULL, 0, 0, bounds);
		}

		void Font::renderUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
		int numGlyphs, int x, int y, RenderMode mode,
		uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH,
		Rect *bounds) {
		if (numGlyphs == 0 \|\| text == NULL \|\| len == 0) {
		return;
		}
		@@ -152,11 +194,16 @@ void Font::renderUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t

		// If it's still not valid, we couldn't cache it, so we shouldn't draw garbage
		if (cachedGlyph->mIsValid) {
		if(bitmap != NULL) {
		drawCachedGlyph(cachedGlyph, penX, penY, bitmap, bitmapW, bitmapH);
		}
		else {
		switch(mode) {
		case FRAMEBUFFER:
		drawCachedGlyph(cachedGlyph, penX, penY);
		break;
		case BITMAP:
		drawCachedGlyph(cachedGlyph, penX, penY, bitmap, bitmapW, bitmapH);
		break;
		case MEASURE:
		measureCachedGlyph(cachedGlyph, penX, penY, bounds);
		break;
		}
		}

		@@ -569,6 +616,32 @@ void FontRenderer::setFont(SkPaint* paint, uint32_t fontId, float fontSize) {
		precacheLatin(paint);
		}
		}
		FontRenderer::DropShadow FontRenderer::renderDropShadow(SkPaint* paint, const char *text,
		uint32_t startIndex, uint32_t len, int numGlyphs, uint32_t radius) {

		Rect bounds;
		mCurrentFont->measureUTF(paint, text, startIndex, len, numGlyphs, &bounds);
		uint32_t paddedWidth = (uint32_t)(bounds.right - bounds.left) + 2*radius;
		uint32_t paddedHeight = (uint32_t)(bounds.top - bounds.bottom) + 2*radius;
		uint8_t* dataBuffer = new uint8_t[paddedWidth * paddedHeight];
		for(uint32_t i = 0; i < paddedWidth * paddedHeight; i ++) {
		dataBuffer[i] = 0;
		}
		int penX = radius - bounds.left;
		int penY = radius - bounds.bottom;

		mCurrentFont->renderUTF(paint, text, startIndex, len, numGlyphs, penX, penY,
		dataBuffer, paddedWidth, paddedHeight);
		blurImage(dataBuffer, paddedWidth, paddedHeight, radius);

		DropShadow image;
		image.width = paddedWidth;
		image.height = paddedHeight;
		image.image = dataBuffer;
		image.penX = penX;
		image.penY = penY;
		return image;
		}

		void FontRenderer::renderText(SkPaint* paint, const Rect* clip, const char *text,
		uint32_t startIndex, uint32_t len, int numGlyphs, int x, int y) {
		@@ -598,11 +671,11 @@ void FontRenderer::computeGaussianWeights(float* weights, int32_t radius) {
		// and sigma varies with radius.
		// Based on some experimental radius values and sigma's
		// we approximately fit sigma = f(radius) as
		// sigma = radius * 0.4 + 0.6
		// sigma = radius * 0.3 + 0.6
		// The larger the radius gets, the more our gaussian blur
		// will resemble a box blur since with large sigma
		// the gaussian curve begins to lose its shape
		float sigma = 0.4f * (float)radius + 0.6f;
		float sigma = 0.3f * (float)radius + 0.6f;

		// Now compute the coefficints
		// We will store some redundant values to save some math during

libs/hwui/FontRenderer.h

+29 −0

Original line number	Diff line number	Diff line
		@@ -45,6 +45,7 @@ public:

		/**
		* Renders the specified string of text.
		* If bitmap is specified, it will be used as the render target
		*/
		void renderUTF(SkPaint* paint, const char *text, uint32_t start, uint32_t len,
		int numGlyphs, int x, int y,
		@@ -57,6 +58,20 @@ public:
		protected:
		friend class FontRenderer;

		enum RenderMode {
		FRAMEBUFFER,
		BITMAP,
		MEASURE,
		};

		void renderUTF(SkPaint* paint, const char *text, uint32_t start, uint32_t len,
		int numGlyphs, int x, int y, RenderMode mode,
		uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH,
		Rect *bounds);

		void measureUTF(SkPaint* paint, const char* text, uint32_t start, uint32_t len,
		int numGlyphs, Rect *bounds);

		struct CachedGlyphInfo {
		// Has the cache been invalidated?
		bool mIsValid;
		@@ -89,6 +104,7 @@ protected:

		CachedGlyphInfo* cacheGlyph(SkPaint* paint, int32_t glyph);
		void updateGlyphCache(SkPaint* paint, const SkGlyph& skiaGlyph, CachedGlyphInfo *glyph);
		void measureCachedGlyph(CachedGlyphInfo glyph, int x, int y, Rect bounds);
		void drawCachedGlyph(CachedGlyphInfo *glyph, int x, int y);
		void drawCachedGlyph(CachedGlyphInfo *glyph, int x, int y,
		uint8_t *bitmap, uint32_t bitmapW, uint32_t bitmapH);
		@@ -112,6 +128,19 @@ public:
		void renderText(SkPaint* paint, const Rect* clip, const char *text, uint32_t startIndex,
		uint32_t len, int numGlyphs, int x, int y);

		struct DropShadow {
		uint32_t width;
		uint32_t height;
		uint8_t* image;
		int32_t penX;
		int32_t penY;
		};

		// After renderDropShadow returns, the called owns the memory in DropShadow.image
		// and is responsible for releasing it when it's done with it
		DropShadow renderDropShadow(SkPaint* paint, const char *text, uint32_t startIndex,
		uint32_t len, int numGlyphs, uint32_t radius);

		GLuint getTexture() {
		checkInit();
		return mTextureId;