1 /* 2 * Copyright 2012 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "picture_utils.h" 9 #include "CopyTilesRenderer.h" 10 #include "SkCanvas.h" 11 #include "SkDevice.h" 12 #include "SkImageEncoder.h" 13 #include "SkPicture.h" 14 #include "SkPixelRef.h" 15 #include "SkRect.h" 16 #include "SkString.h" 17 18 namespace sk_tools { 19 CopyTilesRenderer::CopyTilesRenderer(int x, int y) 20 : fXTilesPerLargeTile(x) 21 , fYTilesPerLargeTile(y) { 22 } 23 void CopyTilesRenderer::init(SkPicture* pict) { 24 SkASSERT(pict != NULL); 25 // Only work with absolute widths (as opposed to percentages). 26 SkASSERT(this->getTileWidth() != 0 && this->getTileHeight() != 0); 27 fPicture = pict; 28 fPicture->ref(); 29 this->buildBBoxHierarchy(); 30 // In order to avoid allocating a large canvas (particularly important for GPU), create one 31 // canvas that is a multiple of the tile size, and draw portions of the picture. 32 fLargeTileWidth = fXTilesPerLargeTile * this->getTileWidth(); 33 fLargeTileHeight = fYTilesPerLargeTile * this->getTileHeight(); 34 fCanvas.reset(this->INHERITED::setupCanvas(fLargeTileWidth, fLargeTileHeight)); 35 } 36 37 bool CopyTilesRenderer::render(const SkString* path, SkBitmap** out) { 38 int i = 0; 39 bool success = true; 40 SkBitmap dst; 41 for (int x = 0; x < this->getViewWidth(); x += fLargeTileWidth) { 42 for (int y = 0; y < this->getViewHeight(); y += fLargeTileHeight) { 43 SkAutoCanvasRestore autoRestore(fCanvas, true); 44 // Translate so that we draw the correct portion of the picture. 45 // Perform a postTranslate so that the scaleFactor does not interfere with the 46 // positioning. 47 SkMatrix mat(fCanvas->getTotalMatrix()); 48 mat.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y)); 49 fCanvas->setMatrix(mat); 50 // Draw the picture 51 fCanvas->drawPicture(*fPicture); 52 // Now extract the picture into tiles 53 const SkBitmap& baseBitmap = fCanvas->getDevice()->accessBitmap(false); 54 SkIRect subset; 55 for (int tileY = 0; tileY < fLargeTileHeight; tileY += this->getTileHeight()) { 56 for (int tileX = 0; tileX < fLargeTileWidth; tileX += this->getTileWidth()) { 57 subset.set(tileX, tileY, tileX + this->getTileWidth(), 58 tileY + this->getTileHeight()); 59 SkDEBUGCODE(bool extracted =) 60 baseBitmap.extractSubset(&dst, subset); 61 SkASSERT(extracted); 62 if (path != NULL) { 63 // Similar to writeAppendNumber in PictureRenderer.cpp, but just encodes 64 // a bitmap directly. 65 SkString pathWithNumber(*path); 66 pathWithNumber.appendf("%i.png", i++); 67 SkBitmap copy; 68 #if SK_SUPPORT_GPU 69 if (isUsingGpuDevice()) { 70 dst.pixelRef()->readPixels(©, &subset); 71 } else { 72 #endif 73 dst.copyTo(©, dst.config()); 74 #if SK_SUPPORT_GPU 75 } 76 #endif 77 success &= SkImageEncoder::EncodeFile(pathWithNumber.c_str(), copy, 78 SkImageEncoder::kPNG_Type, 100); 79 } 80 } 81 } 82 } 83 } 84 return success; 85 } 86 87 SkString CopyTilesRenderer::getConfigNameInternal() { 88 return SkString("copy_tiles"); 89 } 90 } 91
