| /* |
| * Copyright (C) 2010 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. |
| */ |
| |
| #define LOG_TAG "OpenGLRenderer" |
| |
| #include <SkUtils.h> |
| |
| #include <cutils/properties.h> |
| |
| #include <utils/Log.h> |
| |
| #include "Caches.h" |
| #include "Debug.h" |
| #include "FontRenderer.h" |
| #include "Rect.h" |
| |
| namespace android { |
| namespace uirenderer { |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // FontRenderer |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| static bool sLogFontRendererCreate = true; |
| |
| FontRenderer::FontRenderer() { |
| if (sLogFontRendererCreate) { |
| INIT_LOGD("Creating FontRenderer"); |
| } |
| |
| mGammaTable = NULL; |
| mInitialized = false; |
| mMaxNumberOfQuads = 1024; |
| mCurrentQuadIndex = 0; |
| |
| mTextMesh = NULL; |
| mCurrentCacheTexture = NULL; |
| mLastCacheTexture = NULL; |
| |
| mLinearFiltering = false; |
| |
| mIndexBufferID = 0; |
| |
| mSmallCacheWidth = DEFAULT_TEXT_SMALL_CACHE_WIDTH; |
| mSmallCacheHeight = DEFAULT_TEXT_SMALL_CACHE_HEIGHT; |
| mLargeCacheWidth = DEFAULT_TEXT_LARGE_CACHE_WIDTH; |
| mLargeCacheHeight = DEFAULT_TEXT_LARGE_CACHE_HEIGHT; |
| |
| char property[PROPERTY_VALUE_MAX]; |
| if (property_get(PROPERTY_TEXT_SMALL_CACHE_WIDTH, property, NULL) > 0) { |
| mSmallCacheWidth = atoi(property); |
| } |
| |
| if (property_get(PROPERTY_TEXT_SMALL_CACHE_HEIGHT, property, NULL) > 0) { |
| mSmallCacheHeight = atoi(property); |
| } |
| |
| if (property_get(PROPERTY_TEXT_LARGE_CACHE_WIDTH, property, NULL) > 0) { |
| mLargeCacheWidth = atoi(property); |
| } |
| |
| if (property_get(PROPERTY_TEXT_LARGE_CACHE_HEIGHT, property, NULL) > 0) { |
| mLargeCacheHeight = atoi(property); |
| } |
| |
| uint32_t maxTextureSize = (uint32_t) Caches::getInstance().maxTextureSize; |
| mSmallCacheWidth = mSmallCacheWidth > maxTextureSize ? maxTextureSize : mSmallCacheWidth; |
| mSmallCacheHeight = mSmallCacheHeight > maxTextureSize ? maxTextureSize : mSmallCacheHeight; |
| mLargeCacheWidth = mLargeCacheWidth > maxTextureSize ? maxTextureSize : mLargeCacheWidth; |
| mLargeCacheHeight = mLargeCacheHeight > maxTextureSize ? maxTextureSize : mLargeCacheHeight; |
| |
| if (sLogFontRendererCreate) { |
| INIT_LOGD(" Text cache sizes, in pixels: %i x %i, %i x %i, %i x %i, %i x %i", |
| mSmallCacheWidth, mSmallCacheHeight, |
| mLargeCacheWidth, mLargeCacheHeight >> 1, |
| mLargeCacheWidth, mLargeCacheHeight >> 1, |
| mLargeCacheWidth, mLargeCacheHeight); |
| } |
| |
| sLogFontRendererCreate = false; |
| } |
| |
| FontRenderer::~FontRenderer() { |
| for (uint32_t i = 0; i < mCacheTextures.size(); i++) { |
| delete mCacheTextures[i]; |
| } |
| mCacheTextures.clear(); |
| |
| if (mInitialized) { |
| // Unbinding the buffer shouldn't be necessary but it crashes with some drivers |
| Caches::getInstance().unbindIndicesBuffer(); |
| glDeleteBuffers(1, &mIndexBufferID); |
| |
| delete[] mTextMesh; |
| } |
| |
| Vector<Font*> fontsToDereference = mActiveFonts; |
| for (uint32_t i = 0; i < fontsToDereference.size(); i++) { |
| delete fontsToDereference[i]; |
| } |
| } |
| |
| void FontRenderer::flushAllAndInvalidate() { |
| if (mCurrentQuadIndex != 0) { |
| issueDrawCommand(); |
| mCurrentQuadIndex = 0; |
| } |
| |
| for (uint32_t i = 0; i < mActiveFonts.size(); i++) { |
| mActiveFonts[i]->invalidateTextureCache(); |
| } |
| |
| for (uint32_t i = 0; i < mCacheTextures.size(); i++) { |
| mCacheTextures[i]->init(); |
| } |
| |
| #if DEBUG_FONT_RENDERER |
| uint16_t totalGlyphs = 0; |
| for (uint32_t i = 0; i < mCacheTextures.size(); i++) { |
| totalGlyphs += mCacheTextures[i]->getGlyphCount(); |
| // Erase caches, just as a debugging facility |
| if (mCacheTextures[i]->getTexture()) { |
| memset(mCacheTextures[i]->getTexture(), 0, |
| mCacheTextures[i]->getWidth() * mCacheTextures[i]->getHeight()); |
| } |
| } |
| ALOGD("Flushing caches: glyphs cached = %d", totalGlyphs); |
| #endif |
| } |
| |
| void FontRenderer::flushLargeCaches() { |
| // Start from 1; don't deallocate smallest/default texture |
| for (uint32_t i = 1; i < mCacheTextures.size(); i++) { |
| CacheTexture* cacheTexture = mCacheTextures[i]; |
| if (cacheTexture->getTexture()) { |
| cacheTexture->init(); |
| for (uint32_t j = 0; j < mActiveFonts.size(); j++) { |
| mActiveFonts[j]->invalidateTextureCache(cacheTexture); |
| } |
| cacheTexture->releaseTexture(); |
| } |
| } |
| } |
| |
| CacheTexture* FontRenderer::cacheBitmapInTexture(const SkGlyph& glyph, |
| uint32_t* startX, uint32_t* startY) { |
| for (uint32_t i = 0; i < mCacheTextures.size(); i++) { |
| if (mCacheTextures[i]->fitBitmap(glyph, startX, startY)) { |
| return mCacheTextures[i]; |
| } |
| } |
| // Could not fit glyph into current cache textures |
| return NULL; |
| } |
| |
| void FontRenderer::cacheBitmap(const SkGlyph& glyph, CachedGlyphInfo* cachedGlyph, |
| uint32_t* retOriginX, uint32_t* retOriginY, bool precaching) { |
| checkInit(); |
| cachedGlyph->mIsValid = false; |
| // If the glyph is too tall, don't cache it |
| if (glyph.fHeight + TEXTURE_BORDER_SIZE * 2 > |
| mCacheTextures[mCacheTextures.size() - 1]->getHeight()) { |
| ALOGE("Font size too large to fit in cache. width, height = %i, %i", |
| (int) glyph.fWidth, (int) glyph.fHeight); |
| return; |
| } |
| |
| // Now copy the bitmap into the cache texture |
| uint32_t startX = 0; |
| uint32_t startY = 0; |
| |
| CacheTexture* cacheTexture = cacheBitmapInTexture(glyph, &startX, &startY); |
| |
| if (!cacheTexture) { |
| if (!precaching) { |
| // If the new glyph didn't fit and we are not just trying to precache it, |
| // clear out the cache and try again |
| flushAllAndInvalidate(); |
| cacheTexture = cacheBitmapInTexture(glyph, &startX, &startY); |
| } |
| |
| if (!cacheTexture) { |
| // either the glyph didn't fit or we're precaching and will cache it when we draw |
| return; |
| } |
| } |
| |
| cachedGlyph->mCacheTexture = cacheTexture; |
| |
| *retOriginX = startX; |
| *retOriginY = startY; |
| |
| uint32_t endX = startX + glyph.fWidth; |
| uint32_t endY = startY + glyph.fHeight; |
| |
| uint32_t cacheWidth = cacheTexture->getWidth(); |
| |
| if (!cacheTexture->getTexture()) { |
| Caches::getInstance().activeTexture(0); |
| // Large-glyph texture memory is allocated only as needed |
| cacheTexture->allocateTexture(); |
| } |
| |
| uint8_t* cacheBuffer = cacheTexture->getTexture(); |
| uint8_t* bitmapBuffer = (uint8_t*) glyph.fImage; |
| unsigned int stride = glyph.rowBytes(); |
| |
| uint32_t cacheX = 0, bX = 0, cacheY = 0, bY = 0; |
| |
| for (cacheX = startX - TEXTURE_BORDER_SIZE; cacheX < endX + TEXTURE_BORDER_SIZE; cacheX++) { |
| cacheBuffer[(startY - TEXTURE_BORDER_SIZE) * cacheWidth + cacheX] = 0; |
| cacheBuffer[(endY + TEXTURE_BORDER_SIZE - 1) * cacheWidth + cacheX] = 0; |
| } |
| |
| for (cacheY = startY - TEXTURE_BORDER_SIZE + 1; |
| cacheY < endY + TEXTURE_BORDER_SIZE - 1; cacheY++) { |
| cacheBuffer[cacheY * cacheWidth + startX - TEXTURE_BORDER_SIZE] = 0; |
| cacheBuffer[cacheY * cacheWidth + endX + TEXTURE_BORDER_SIZE - 1] = 0; |
| } |
| |
| if (mGammaTable) { |
| for (cacheX = startX, bX = 0; cacheX < endX; cacheX++, bX++) { |
| for (cacheY = startY, bY = 0; cacheY < endY; cacheY++, bY++) { |
| uint8_t tempCol = bitmapBuffer[bY * stride + bX]; |
| cacheBuffer[cacheY * cacheWidth + cacheX] = mGammaTable[tempCol]; |
| } |
| } |
| } else { |
| for (cacheX = startX, bX = 0; cacheX < endX; cacheX++, bX++) { |
| for (cacheY = startY, bY = 0; cacheY < endY; cacheY++, bY++) { |
| uint8_t tempCol = bitmapBuffer[bY * stride + bX]; |
| cacheBuffer[cacheY * cacheWidth + cacheX] = tempCol; |
| } |
| } |
| } |
| |
| cachedGlyph->mIsValid = true; |
| } |
| |
| CacheTexture* FontRenderer::createCacheTexture(int width, int height, bool allocate) { |
| CacheTexture* cacheTexture = new CacheTexture(width, height); |
| |
| if (allocate) { |
| Caches::getInstance().activeTexture(0); |
| cacheTexture->allocateTexture(); |
| } |
| |
| return cacheTexture; |
| } |
| |
| void FontRenderer::initTextTexture() { |
| for (uint32_t i = 0; i < mCacheTextures.size(); i++) { |
| delete mCacheTextures[i]; |
| } |
| mCacheTextures.clear(); |
| |
| mUploadTexture = false; |
| mCacheTextures.push(createCacheTexture(mSmallCacheWidth, mSmallCacheHeight, true)); |
| mCacheTextures.push(createCacheTexture(mLargeCacheWidth, mLargeCacheHeight >> 1, false)); |
| mCacheTextures.push(createCacheTexture(mLargeCacheWidth, mLargeCacheHeight >> 1, false)); |
| mCacheTextures.push(createCacheTexture(mLargeCacheWidth, mLargeCacheHeight, false)); |
| mCurrentCacheTexture = mCacheTextures[0]; |
| } |
| |
| // Avoid having to reallocate memory and render quad by quad |
| void FontRenderer::initVertexArrayBuffers() { |
| uint32_t numIndices = mMaxNumberOfQuads * 6; |
| uint32_t indexBufferSizeBytes = numIndices * sizeof(uint16_t); |
| uint16_t* indexBufferData = (uint16_t*) malloc(indexBufferSizeBytes); |
| |
| // Four verts, two triangles , six indices per quad |
| for (uint32_t i = 0; i < mMaxNumberOfQuads; i++) { |
| int i6 = i * 6; |
| int i4 = i * 4; |
| |
| indexBufferData[i6 + 0] = i4 + 0; |
| indexBufferData[i6 + 1] = i4 + 1; |
| indexBufferData[i6 + 2] = i4 + 2; |
| |
| indexBufferData[i6 + 3] = i4 + 0; |
| indexBufferData[i6 + 4] = i4 + 2; |
| indexBufferData[i6 + 5] = i4 + 3; |
| } |
| |
| glGenBuffers(1, &mIndexBufferID); |
| Caches::getInstance().bindIndicesBuffer(mIndexBufferID); |
| glBufferData(GL_ELEMENT_ARRAY_BUFFER, indexBufferSizeBytes, indexBufferData, GL_STATIC_DRAW); |
| |
| free(indexBufferData); |
| |
| uint32_t coordSize = 2; |
| uint32_t uvSize = 2; |
| uint32_t vertsPerQuad = 4; |
| uint32_t vertexBufferSize = mMaxNumberOfQuads * vertsPerQuad * coordSize * uvSize; |
| mTextMesh = new float[vertexBufferSize]; |
| } |
| |
| // We don't want to allocate anything unless we actually draw text |
| void FontRenderer::checkInit() { |
| if (mInitialized) { |
| return; |
| } |
| |
| initTextTexture(); |
| initVertexArrayBuffers(); |
| |
| mInitialized = true; |
| } |
| |
| void FontRenderer::checkTextureUpdate() { |
| if (!mUploadTexture && mLastCacheTexture == mCurrentCacheTexture) { |
| return; |
| } |
| |
| Caches& caches = Caches::getInstance(); |
| GLuint lastTextureId = 0; |
| // Iterate over all the cache textures and see which ones need to be updated |
| for (uint32_t i = 0; i < mCacheTextures.size(); i++) { |
| CacheTexture* cacheTexture = mCacheTextures[i]; |
| if (cacheTexture->isDirty() && cacheTexture->getTexture()) { |
| // Can't copy inner rect; glTexSubimage expects pointer to deal with entire buffer |
| // of data. So expand the dirty rect to the encompassing horizontal stripe. |
| const Rect* dirtyRect = cacheTexture->getDirtyRect(); |
| uint32_t x = 0; |
| uint32_t y = dirtyRect->top; |
| uint32_t width = cacheTexture->getWidth(); |
| uint32_t height = dirtyRect->getHeight(); |
| void* textureData = cacheTexture->getTexture() + y * width; |
| |
| if (cacheTexture->getTextureId() != lastTextureId) { |
| lastTextureId = cacheTexture->getTextureId(); |
| caches.activeTexture(0); |
| glBindTexture(GL_TEXTURE_2D, lastTextureId); |
| } |
| #if DEBUG_FONT_RENDERER |
| ALOGD("glTexSubimage for cacheTexture %d: x, y, width height = %d, %d, %d, %d", |
| i, x, y, width, height); |
| #endif |
| glTexSubImage2D(GL_TEXTURE_2D, 0, x, y, width, height, |
| GL_ALPHA, GL_UNSIGNED_BYTE, textureData); |
| cacheTexture->setDirty(false); |
| } |
| } |
| |
| caches.activeTexture(0); |
| glBindTexture(GL_TEXTURE_2D, mCurrentCacheTexture->getTextureId()); |
| |
| mCurrentCacheTexture->setLinearFiltering(mLinearFiltering, false); |
| mLastCacheTexture = mCurrentCacheTexture; |
| |
| mUploadTexture = false; |
| } |
| |
| void FontRenderer::issueDrawCommand() { |
| checkTextureUpdate(); |
| |
| Caches& caches = Caches::getInstance(); |
| caches.bindIndicesBuffer(mIndexBufferID); |
| if (!mDrawn) { |
| float* buffer = mTextMesh; |
| int offset = 2; |
| |
| bool force = caches.unbindMeshBuffer(); |
| caches.bindPositionVertexPointer(force, buffer); |
| caches.bindTexCoordsVertexPointer(force, buffer + offset); |
| } |
| |
| glDrawElements(GL_TRIANGLES, mCurrentQuadIndex * 6, GL_UNSIGNED_SHORT, NULL); |
| |
| mDrawn = true; |
| } |
| |
| void FontRenderer::appendMeshQuadNoClip(float x1, float y1, float u1, float v1, |
| float x2, float y2, float u2, float v2, float x3, float y3, float u3, float v3, |
| float x4, float y4, float u4, float v4, CacheTexture* texture) { |
| if (texture != mCurrentCacheTexture) { |
| if (mCurrentQuadIndex != 0) { |
| // First, draw everything stored already which uses the previous texture |
| issueDrawCommand(); |
| mCurrentQuadIndex = 0; |
| } |
| // Now use the new texture id |
| mCurrentCacheTexture = texture; |
| } |
| |
| const uint32_t vertsPerQuad = 4; |
| const uint32_t floatsPerVert = 4; |
| float* currentPos = mTextMesh + mCurrentQuadIndex * vertsPerQuad * floatsPerVert; |
| |
| (*currentPos++) = x1; |
| (*currentPos++) = y1; |
| (*currentPos++) = u1; |
| (*currentPos++) = v1; |
| |
| (*currentPos++) = x2; |
| (*currentPos++) = y2; |
| (*currentPos++) = u2; |
| (*currentPos++) = v2; |
| |
| (*currentPos++) = x3; |
| (*currentPos++) = y3; |
| (*currentPos++) = u3; |
| (*currentPos++) = v3; |
| |
| (*currentPos++) = x4; |
| (*currentPos++) = y4; |
| (*currentPos++) = u4; |
| (*currentPos++) = v4; |
| |
| mCurrentQuadIndex++; |
| } |
| |
| void FontRenderer::appendMeshQuad(float x1, float y1, float u1, float v1, |
| float x2, float y2, float u2, float v2, float x3, float y3, float u3, float v3, |
| float x4, float y4, float u4, float v4, CacheTexture* texture) { |
| |
| if (mClip && |
| (x1 > mClip->right || y1 < mClip->top || x2 < mClip->left || y4 > mClip->bottom)) { |
| return; |
| } |
| |
| appendMeshQuadNoClip(x1, y1, u1, v1, x2, y2, u2, v2, x3, y3, u3, v3, x4, y4, u4, v4, texture); |
| |
| if (mBounds) { |
| mBounds->left = fmin(mBounds->left, x1); |
| mBounds->top = fmin(mBounds->top, y3); |
| mBounds->right = fmax(mBounds->right, x3); |
| mBounds->bottom = fmax(mBounds->bottom, y1); |
| } |
| |
| if (mCurrentQuadIndex == mMaxNumberOfQuads) { |
| issueDrawCommand(); |
| mCurrentQuadIndex = 0; |
| } |
| } |
| |
| void FontRenderer::appendRotatedMeshQuad(float x1, float y1, float u1, float v1, |
| float x2, float y2, float u2, float v2, float x3, float y3, float u3, float v3, |
| float x4, float y4, float u4, float v4, CacheTexture* texture) { |
| |
| appendMeshQuadNoClip(x1, y1, u1, v1, x2, y2, u2, v2, x3, y3, u3, v3, x4, y4, u4, v4, texture); |
| |
| if (mBounds) { |
| mBounds->left = fmin(mBounds->left, fmin(x1, fmin(x2, fmin(x3, x4)))); |
| mBounds->top = fmin(mBounds->top, fmin(y1, fmin(y2, fmin(y3, y4)))); |
| mBounds->right = fmax(mBounds->right, fmax(x1, fmax(x2, fmax(x3, x4)))); |
| mBounds->bottom = fmax(mBounds->bottom, fmax(y1, fmax(y2, fmax(y3, y4)))); |
| } |
| |
| if (mCurrentQuadIndex == mMaxNumberOfQuads) { |
| issueDrawCommand(); |
| mCurrentQuadIndex = 0; |
| } |
| } |
| |
| void FontRenderer::setFont(SkPaint* paint, uint32_t fontId, float fontSize) { |
| int flags = 0; |
| if (paint->isFakeBoldText()) { |
| flags |= Font::kFakeBold; |
| } |
| |
| const float skewX = paint->getTextSkewX(); |
| uint32_t italicStyle = *(uint32_t*) &skewX; |
| const float scaleXFloat = paint->getTextScaleX(); |
| uint32_t scaleX = *(uint32_t*) &scaleXFloat; |
| SkPaint::Style style = paint->getStyle(); |
| const float strokeWidthFloat = paint->getStrokeWidth(); |
| uint32_t strokeWidth = *(uint32_t*) &strokeWidthFloat; |
| mCurrentFont = Font::create(this, fontId, fontSize, flags, italicStyle, |
| scaleX, style, strokeWidth); |
| |
| } |
| |
| FontRenderer::DropShadow FontRenderer::renderDropShadow(SkPaint* paint, const char *text, |
| uint32_t startIndex, uint32_t len, int numGlyphs, uint32_t radius, const float* positions) { |
| checkInit(); |
| |
| if (!mCurrentFont) { |
| DropShadow image; |
| image.width = 0; |
| image.height = 0; |
| image.image = NULL; |
| image.penX = 0; |
| image.penY = 0; |
| return image; |
| } |
| |
| mDrawn = false; |
| mClip = NULL; |
| mBounds = NULL; |
| |
| Rect bounds; |
| mCurrentFont->measure(paint, text, startIndex, len, numGlyphs, &bounds, positions); |
| |
| 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->render(paint, text, startIndex, len, numGlyphs, penX, penY, |
| Font::BITMAP, dataBuffer, paddedWidth, paddedHeight, NULL, positions); |
| 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::initRender(const Rect* clip, Rect* bounds) { |
| checkInit(); |
| |
| mDrawn = false; |
| mBounds = bounds; |
| mClip = clip; |
| } |
| |
| void FontRenderer::finishRender() { |
| mBounds = NULL; |
| mClip = NULL; |
| |
| if (mCurrentQuadIndex != 0) { |
| issueDrawCommand(); |
| mCurrentQuadIndex = 0; |
| } |
| } |
| |
| void FontRenderer::precache(SkPaint* paint, const char* text, int numGlyphs) { |
| int flags = 0; |
| if (paint->isFakeBoldText()) { |
| flags |= Font::kFakeBold; |
| } |
| const float skewX = paint->getTextSkewX(); |
| uint32_t italicStyle = *(uint32_t*) &skewX; |
| const float scaleXFloat = paint->getTextScaleX(); |
| uint32_t scaleX = *(uint32_t*) &scaleXFloat; |
| SkPaint::Style style = paint->getStyle(); |
| const float strokeWidthFloat = paint->getStrokeWidth(); |
| uint32_t strokeWidth = *(uint32_t*) &strokeWidthFloat; |
| float fontSize = paint->getTextSize(); |
| Font* font = Font::create(this, SkTypeface::UniqueID(paint->getTypeface()), |
| fontSize, flags, italicStyle, scaleX, style, strokeWidth); |
| |
| font->precache(paint, text, numGlyphs); |
| } |
| |
| bool FontRenderer::renderText(SkPaint* paint, const Rect* clip, const char *text, |
| uint32_t startIndex, uint32_t len, int numGlyphs, int x, int y, Rect* bounds) { |
| if (!mCurrentFont) { |
| ALOGE("No font set"); |
| return false; |
| } |
| |
| initRender(clip, bounds); |
| mCurrentFont->render(paint, text, startIndex, len, numGlyphs, x, y); |
| finishRender(); |
| |
| return mDrawn; |
| } |
| |
| bool FontRenderer::renderPosText(SkPaint* paint, const Rect* clip, const char *text, |
| uint32_t startIndex, uint32_t len, int numGlyphs, int x, int y, |
| const float* positions, Rect* bounds) { |
| if (!mCurrentFont) { |
| ALOGE("No font set"); |
| return false; |
| } |
| |
| initRender(clip, bounds); |
| mCurrentFont->render(paint, text, startIndex, len, numGlyphs, x, y, positions); |
| finishRender(); |
| |
| return mDrawn; |
| } |
| |
| bool FontRenderer::renderTextOnPath(SkPaint* paint, const Rect* clip, const char *text, |
| uint32_t startIndex, uint32_t len, int numGlyphs, SkPath* path, |
| float hOffset, float vOffset, Rect* bounds) { |
| if (!mCurrentFont) { |
| ALOGE("No font set"); |
| return false; |
| } |
| |
| initRender(clip, bounds); |
| mCurrentFont->render(paint, text, startIndex, len, numGlyphs, path, hOffset, vOffset); |
| finishRender(); |
| |
| return mDrawn; |
| } |
| |
| void FontRenderer::removeFont(const Font* font) { |
| for (uint32_t ct = 0; ct < mActiveFonts.size(); ct++) { |
| if (mActiveFonts[ct] == font) { |
| mActiveFonts.removeAt(ct); |
| break; |
| } |
| } |
| |
| if (mCurrentFont == font) { |
| mCurrentFont = NULL; |
| } |
| } |
| |
| void FontRenderer::computeGaussianWeights(float* weights, int32_t radius) { |
| // Compute gaussian weights for the blur |
| // e is the euler's number |
| float e = 2.718281828459045f; |
| float pi = 3.1415926535897932f; |
| // g(x) = ( 1 / sqrt( 2 * pi ) * sigma) * e ^ ( -x^2 / 2 * sigma^2 ) |
| // x is of the form [-radius .. 0 .. radius] |
| // and sigma varies with radius. |
| // Based on some experimental radius values and sigma's |
| // we approximately fit sigma = f(radius) as |
| // sigma = radius * 0.3 + 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 = 0.3f * (float) radius + 0.6f; |
| |
| // Now compute the coefficints |
| // We will store some redundant values to save some math during |
| // the blur calculations |
| // precompute some values |
| float coeff1 = 1.0f / (sqrt( 2.0f * pi ) * sigma); |
| float coeff2 = - 1.0f / (2.0f * sigma * sigma); |
| |
| float normalizeFactor = 0.0f; |
| for (int32_t r = -radius; r <= radius; r ++) { |
| float floatR = (float) r; |
| weights[r + radius] = coeff1 * pow(e, floatR * floatR * coeff2); |
| normalizeFactor += weights[r + radius]; |
| } |
| |
| //Now we need to normalize the weights because all our coefficients need to add up to one |
| normalizeFactor = 1.0f / normalizeFactor; |
| for (int32_t r = -radius; r <= radius; r ++) { |
| weights[r + radius] *= normalizeFactor; |
| } |
| } |
| |
| void FontRenderer::horizontalBlur(float* weights, int32_t radius, |
| const uint8_t* source, uint8_t* dest, int32_t width, int32_t height) { |
| float blurredPixel = 0.0f; |
| float currentPixel = 0.0f; |
| |
| for (int32_t y = 0; y < height; y ++) { |
| |
| const uint8_t* input = source + y * width; |
| uint8_t* output = dest + y * width; |
| |
| for (int32_t x = 0; x < width; x ++) { |
| blurredPixel = 0.0f; |
| const float* gPtr = weights; |
| // Optimization for non-border pixels |
| if (x > radius && x < (width - radius)) { |
| const uint8_t *i = input + (x - radius); |
| for (int r = -radius; r <= radius; r ++) { |
| currentPixel = (float) (*i); |
| blurredPixel += currentPixel * gPtr[0]; |
| gPtr++; |
| i++; |
| } |
| } else { |
| for (int32_t r = -radius; r <= radius; r ++) { |
| // Stepping left and right away from the pixel |
| int validW = x + r; |
| if (validW < 0) { |
| validW = 0; |
| } |
| if (validW > width - 1) { |
| validW = width - 1; |
| } |
| |
| currentPixel = (float) input[validW]; |
| blurredPixel += currentPixel * gPtr[0]; |
| gPtr++; |
| } |
| } |
| *output = (uint8_t)blurredPixel; |
| output ++; |
| } |
| } |
| } |
| |
| void FontRenderer::verticalBlur(float* weights, int32_t radius, |
| const uint8_t* source, uint8_t* dest, int32_t width, int32_t height) { |
| float blurredPixel = 0.0f; |
| float currentPixel = 0.0f; |
| |
| for (int32_t y = 0; y < height; y ++) { |
| uint8_t* output = dest + y * width; |
| |
| for (int32_t x = 0; x < width; x ++) { |
| blurredPixel = 0.0f; |
| const float* gPtr = weights; |
| const uint8_t* input = source + x; |
| // Optimization for non-border pixels |
| if (y > radius && y < (height - radius)) { |
| const uint8_t *i = input + ((y - radius) * width); |
| for (int32_t r = -radius; r <= radius; r ++) { |
| currentPixel = (float)(*i); |
| blurredPixel += currentPixel * gPtr[0]; |
| gPtr++; |
| i += width; |
| } |
| } else { |
| for (int32_t r = -radius; r <= radius; r ++) { |
| int validH = y + r; |
| // Clamp to zero and width |
| if (validH < 0) { |
| validH = 0; |
| } |
| if (validH > height - 1) { |
| validH = height - 1; |
| } |
| |
| const uint8_t *i = input + validH * width; |
| currentPixel = (float) (*i); |
| blurredPixel += currentPixel * gPtr[0]; |
| gPtr++; |
| } |
| } |
| *output = (uint8_t) blurredPixel; |
| output++; |
| } |
| } |
| } |
| |
| |
| void FontRenderer::blurImage(uint8_t *image, int32_t width, int32_t height, int32_t radius) { |
| float *gaussian = new float[2 * radius + 1]; |
| computeGaussianWeights(gaussian, radius); |
| |
| uint8_t* scratch = new uint8_t[width * height]; |
| |
| horizontalBlur(gaussian, radius, image, scratch, width, height); |
| verticalBlur(gaussian, radius, scratch, image, width, height); |
| |
| delete[] gaussian; |
| delete[] scratch; |
| } |
| |
| }; // namespace uirenderer |
| }; // namespace android |
