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