зеркало из https://github.com/mozilla/moz-skia.git
91 строка
3.8 KiB
C++
91 строка
3.8 KiB
C++
/*
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* Copyright 2012 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "picture_utils.h"
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#include "CopyTilesRenderer.h"
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#include "SkCanvas.h"
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#include "SkDevice.h"
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#include "SkImageEncoder.h"
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#include "SkPicture.h"
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#include "SkPixelRef.h"
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#include "SkRect.h"
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#include "SkString.h"
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namespace sk_tools {
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CopyTilesRenderer::CopyTilesRenderer(int x, int y)
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: fXTilesPerLargeTile(x)
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, fYTilesPerLargeTile(y) {
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}
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void CopyTilesRenderer::init(SkPicture* pict) {
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SkASSERT(pict != NULL);
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// Only work with absolute widths (as opposed to percentages).
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SkASSERT(this->getTileWidth() != 0 && this->getTileHeight() != 0);
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fPicture = pict;
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fPicture->ref();
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this->buildBBoxHierarchy();
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// In order to avoid allocating a large canvas (particularly important for GPU), create one
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// canvas that is a multiple of the tile size, and draw portions of the picture.
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fLargeTileWidth = fXTilesPerLargeTile * this->getTileWidth();
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fLargeTileHeight = fYTilesPerLargeTile * this->getTileHeight();
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fCanvas.reset(this->INHERITED::setupCanvas(fLargeTileWidth, fLargeTileHeight));
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}
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bool CopyTilesRenderer::render(const SkString* path, SkBitmap** out) {
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int i = 0;
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bool success = true;
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SkBitmap dst;
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for (int x = 0; x < this->getViewWidth(); x += fLargeTileWidth) {
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for (int y = 0; y < this->getViewHeight(); y += fLargeTileHeight) {
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SkAutoCanvasRestore autoRestore(fCanvas, true);
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// Translate so that we draw the correct portion of the picture.
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// Perform a postTranslate so that the scaleFactor does not interfere with the
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// positioning.
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SkMatrix mat(fCanvas->getTotalMatrix());
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mat.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
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fCanvas->setMatrix(mat);
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// Draw the picture
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fCanvas->drawPicture(*fPicture);
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// Now extract the picture into tiles
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const SkBitmap& baseBitmap = fCanvas->getDevice()->accessBitmap(false);
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SkIRect subset;
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for (int tileY = 0; tileY < fLargeTileHeight; tileY += this->getTileHeight()) {
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for (int tileX = 0; tileX < fLargeTileWidth; tileX += this->getTileWidth()) {
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subset.set(tileX, tileY, tileX + this->getTileWidth(),
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tileY + this->getTileHeight());
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SkDEBUGCODE(bool extracted =)
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baseBitmap.extractSubset(&dst, subset);
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SkASSERT(extracted);
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if (path != NULL) {
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// Similar to writeAppendNumber in PictureRenderer.cpp, but just encodes
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// a bitmap directly.
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SkString pathWithNumber(*path);
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pathWithNumber.appendf("%i.png", i++);
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SkBitmap copy;
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#if SK_SUPPORT_GPU
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if (isUsingGpuDevice()) {
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dst.pixelRef()->readPixels(©, &subset);
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} else {
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#endif
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dst.copyTo(©, dst.config());
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#if SK_SUPPORT_GPU
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}
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#endif
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success &= SkImageEncoder::EncodeFile(pathWithNumber.c_str(), copy,
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SkImageEncoder::kPNG_Type, 100);
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}
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}
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}
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}
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}
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return success;
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}
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SkString CopyTilesRenderer::getConfigNameInternal() {
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return SkString("copy_tiles");
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}
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}
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