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skia2/dm/DMSrcSink.cpp
msarett e6dd004c1b Fill incomplete images in SkCodec parent class 
Rather than implementing some sort of "fill" in every
SkCodec subclass for incomplete images, let's make the
parent class handle this situation.

This includes an API change to SkCodec.h

SkCodec::getScanlines() now returns the number of lines it
read successfully, rather than an SkCodec::Result enum.
getScanlines() most often fails on an incomplete input, in
which case it is useful to know how many lines were
successfully decoded - this provides more information than
kIncomplete vs kSuccess.  We do lose information when the
API is used improperly, as we are no longer able to return
kInvalidParameter or kScanlineNotStarted.

Known Issues:
Does not work for incomplete fFrameIsSubset gifs.
Does not work for incomplete icos.

BUG=skia:

Review URL: https://codereview.chromium.org/1332053002
2015-10-09 11:07:34 -07:00

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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "DMSrcSink.h"
#include "SamplePipeControllers.h"
#include "SkCodec.h"
#include "SkCodecTools.h"
#include "SkCommonFlags.h"
#include "SkData.h"
#include "SkDocument.h"
#include "SkError.h"
#include "SkFunction.h"
#include "SkImageGenerator.h"
#include "SkMultiPictureDraw.h"
#include "SkNullCanvas.h"
#include "SkOSFile.h"
#include "SkPictureData.h"
#include "SkPictureRecorder.h"
#include "SkRandom.h"
#include "SkRecordDraw.h"
#include "SkRecorder.h"
#include "SkSVGCanvas.h"
#include "SkScaledCodec.h"
#include "SkStream.h"
#include "SkTLogic.h"
#include "SkXMLWriter.h"
#include "SkScaledCodec.h"
#include "SkSwizzler.h"
DEFINE_bool(multiPage, false, "For document-type backends, render the source"
" into multiple pages");
static bool lazy_decode_bitmap(const void* src, size_t size, SkBitmap* dst) {
SkAutoTUnref<SkData> encoded(SkData::NewWithCopy(src, size));
return encoded && SkDEPRECATED_InstallDiscardablePixelRef(encoded, dst);
}
namespace DM {
GMSrc::GMSrc(skiagm::GMRegistry::Factory factory) : fFactory(factory) {}
Error GMSrc::draw(SkCanvas* canvas) const {
SkAutoTDelete<skiagm::GM> gm(fFactory(nullptr));
canvas->concat(gm->getInitialTransform());
gm->draw(canvas);
return "";
}
SkISize GMSrc::size() const {
SkAutoTDelete<skiagm::GM> gm(fFactory(nullptr));
return gm->getISize();
}
Name GMSrc::name() const {
SkAutoTDelete<skiagm::GM> gm(fFactory(nullptr));
return gm->getName();
}
void GMSrc::modifyGrContextOptions(GrContextOptions* options) const {
SkAutoTDelete<skiagm::GM> gm(fFactory(nullptr));
gm->modifyGrContextOptions(options);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
BRDSrc::BRDSrc(Path path, SkBitmapRegionDecoderInterface::Strategy strategy, Mode mode,
CodecSrc::DstColorType dstColorType, uint32_t sampleSize)
: fPath(path)
, fStrategy(strategy)
, fMode(mode)
, fDstColorType(dstColorType)
, fSampleSize(sampleSize)
{}
bool BRDSrc::veto(SinkFlags flags) const {
// No need to test to non-raster or indirect backends.
return flags.type != SinkFlags::kRaster
|| flags.approach != SinkFlags::kDirect;
}
static SkBitmapRegionDecoderInterface* create_brd(Path path,
SkBitmapRegionDecoderInterface::Strategy strategy) {
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(path.c_str()));
if (!encoded) {
return NULL;
}
return SkBitmapRegionDecoderInterface::CreateBitmapRegionDecoder(new SkMemoryStream(encoded),
strategy);
}
Error BRDSrc::draw(SkCanvas* canvas) const {
SkColorType colorType = canvas->imageInfo().colorType();
if (kRGB_565_SkColorType == colorType &&
CodecSrc::kGetFromCanvas_DstColorType != fDstColorType) {
return Error::Nonfatal("Testing non-565 to 565 is uninteresting.");
}
switch (fDstColorType) {
case CodecSrc::kGetFromCanvas_DstColorType:
break;
case CodecSrc::kIndex8_Always_DstColorType:
colorType = kIndex_8_SkColorType;
break;
case CodecSrc::kGrayscale_Always_DstColorType:
colorType = kGray_8_SkColorType;
break;
}
SkAutoTDelete<SkBitmapRegionDecoderInterface> brd(create_brd(fPath, fStrategy));
if (nullptr == brd.get()) {
return Error::Nonfatal(SkStringPrintf("Could not create brd for %s.", fPath.c_str()));
}
const uint32_t width = brd->width();
const uint32_t height = brd->height();
// Visually inspecting very small output images is not necessary.
if ((width / fSampleSize <= 10 || height / fSampleSize <= 10) && 1 != fSampleSize) {
return Error::Nonfatal("Scaling very small images is uninteresting.");
}
switch (fMode) {
case kFullImage_Mode: {
SkAutoTDelete<SkBitmap> bitmap(brd->decodeRegion(0, 0, width, height, fSampleSize,
colorType));
if (nullptr == bitmap.get() || colorType != bitmap->colorType()) {
return Error::Nonfatal("Cannot convert to color type.\n");
}
canvas->drawBitmap(*bitmap, 0, 0);
return "";
}
case kDivisor_Mode: {
const uint32_t divisor = 2;
if (width < divisor || height < divisor) {
return Error::Nonfatal("Divisor is larger than image dimension.\n");
}
// Use a border to test subsets that extend outside the image.
// We will not allow the border to be larger than the image dimensions. Allowing
// these large borders causes off by one errors that indicate a problem with the
// test suite, not a problem with the implementation.
const uint32_t maxBorder = SkTMin(width, height) / (fSampleSize * divisor);
const uint32_t scaledBorder = SkTMin(5u, maxBorder);
const uint32_t unscaledBorder = scaledBorder * fSampleSize;
// We may need to clear the canvas to avoid uninitialized memory.
// Assume we are scaling a 780x780 image with sampleSize = 8.
// The output image should be 97x97.
// Each subset will be 390x390.
// Each scaled subset be 48x48.
// Four scaled subsets will only fill a 96x96 image.
// The bottom row and last column will not be touched.
// This is an unfortunate result of our rounding rules when scaling.
// Maybe we need to consider testing scaled subsets without trying to
// combine them to match the full scaled image? Or maybe this is the
// best we can do?
canvas->clear(0);
for (uint32_t x = 0; x < divisor; x++) {
for (uint32_t y = 0; y < divisor; y++) {
// Calculate the subset dimensions
uint32_t subsetWidth = width / divisor;
uint32_t subsetHeight = height / divisor;
const int left = x * subsetWidth;
const int top = y * subsetHeight;
// Increase the size of the last subset in each row or column, when the
// divisor does not divide evenly into the image dimensions
subsetWidth += (x + 1 == divisor) ? (width % divisor) : 0;
subsetHeight += (y + 1 == divisor) ? (height % divisor) : 0;
// Increase the size of the subset in order to have a border on each side
const int decodeLeft = left - unscaledBorder;
const int decodeTop = top - unscaledBorder;
const uint32_t decodeWidth = subsetWidth + unscaledBorder * 2;
const uint32_t decodeHeight = subsetHeight + unscaledBorder * 2;
SkAutoTDelete<SkBitmap> bitmap(brd->decodeRegion(decodeLeft,
decodeTop, decodeWidth, decodeHeight, fSampleSize, colorType));
if (nullptr == bitmap.get() || colorType != bitmap->colorType()) {
return Error::Nonfatal("Cannot convert to color type.\n");
}
canvas->drawBitmapRect(*bitmap,
SkRect::MakeXYWH((SkScalar) scaledBorder, (SkScalar) scaledBorder,
(SkScalar) (subsetWidth / fSampleSize),
(SkScalar) (subsetHeight / fSampleSize)),
SkRect::MakeXYWH((SkScalar) (left / fSampleSize),
(SkScalar) (top / fSampleSize),
(SkScalar) (subsetWidth / fSampleSize),
(SkScalar) (subsetHeight / fSampleSize)),
nullptr);
}
}
return "";
}
default:
SkASSERT(false);
return "Error: Should not be reached.\n";
}
}
SkISize BRDSrc::size() const {
SkAutoTDelete<SkBitmapRegionDecoderInterface> brd(create_brd(fPath, fStrategy));
if (brd) {
return SkISize::Make(SkTMax(1, brd->width() / (int) fSampleSize),
SkTMax(1, brd->height() / (int) fSampleSize));
}
return SkISize::Make(0, 0);
}
static SkString get_scaled_name(const Path& path, float scale) {
return SkStringPrintf("%s_%.3f", SkOSPath::Basename(path.c_str()).c_str(), scale);
}
Name BRDSrc::name() const {
// We will replicate the names used by CodecSrc so that images can
// be compared in Gold.
if (1 == fSampleSize) {
return SkOSPath::Basename(fPath.c_str());
}
return get_scaled_name(fPath, get_scale_from_sample_size(fSampleSize));
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
CodecSrc::CodecSrc(Path path, Mode mode, DstColorType dstColorType, float scale)
: fPath(path)
, fMode(mode)
, fDstColorType(dstColorType)
, fScale(scale)
{}
bool CodecSrc::veto(SinkFlags flags) const {
// No need to test decoding to non-raster or indirect backend.
// TODO: Once we implement GPU paths (e.g. JPEG YUV), we should use a deferred decode to
// let the GPU handle it.
return flags.type != SinkFlags::kRaster
|| flags.approach != SinkFlags::kDirect;
}
Error CodecSrc::draw(SkCanvas* canvas) const {
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
if (!encoded) {
return SkStringPrintf("Couldn't read %s.", fPath.c_str());
}
SkAutoTDelete<SkCodec> codec(NULL);
if (kScaledCodec_Mode == fMode) {
codec.reset(SkScaledCodec::NewFromData(encoded));
// TODO (msarett): This should fall through to a fatal error once we support scaled
// codecs for all image types.
if (nullptr == codec.get()) {
return Error::Nonfatal(SkStringPrintf("Couldn't create scaled codec for %s.",
fPath.c_str()));
}
} else {
codec.reset(SkCodec::NewFromData(encoded));
}
if (nullptr == codec.get()) {
return SkStringPrintf("Couldn't create codec for %s.", fPath.c_str());
}
// Choose the color type to decode to
SkImageInfo decodeInfo = codec->getInfo();
SkColorType canvasColorType = canvas->imageInfo().colorType();
switch (fDstColorType) {
case kIndex8_Always_DstColorType:
decodeInfo = codec->getInfo().makeColorType(kIndex_8_SkColorType);
if (kRGB_565_SkColorType == canvasColorType) {
return Error::Nonfatal("Testing non-565 to 565 is uninteresting.");
}
break;
case kGrayscale_Always_DstColorType:
decodeInfo = codec->getInfo().makeColorType(kGray_8_SkColorType);
if (kRGB_565_SkColorType == canvasColorType) {
return Error::Nonfatal("Testing non-565 to 565 is uninteresting.");
}
break;
default:
decodeInfo = decodeInfo.makeColorType(canvasColorType);
break;
}
// Try to scale the image if it is desired
SkISize size = codec->getScaledDimensions(fScale);
if (size == decodeInfo.dimensions() && 1.0f != fScale) {
return Error::Nonfatal("Test without scaling is uninteresting.");
}
// Visually inspecting very small output images is not necessary. We will
// cover these cases in unit testing.
if ((size.width() <= 10 || size.height() <= 10) && 1.0f != fScale) {
return Error::Nonfatal("Scaling very small images is uninteresting.");
}
decodeInfo = decodeInfo.makeWH(size.width(), size.height());
// Construct a color table for the decode if necessary
SkAutoTUnref<SkColorTable> colorTable(nullptr);
SkPMColor* colorPtr = nullptr;
int* colorCountPtr = nullptr;
int maxColors = 256;
if (kIndex_8_SkColorType == decodeInfo.colorType()) {
SkPMColor colors[256];
colorTable.reset(new SkColorTable(colors, maxColors));
colorPtr = const_cast<SkPMColor*>(colorTable->readColors());
colorCountPtr = &maxColors;
}
// FIXME: Currently we cannot draw unpremultiplied sources.
if (decodeInfo.alphaType() == kUnpremul_SkAlphaType) {
decodeInfo = decodeInfo.makeAlphaType(kPremul_SkAlphaType);
}
SkBitmap bitmap;
if (!bitmap.tryAllocPixels(decodeInfo, nullptr, colorTable.get())) {
return SkStringPrintf("Image(%s) is too large (%d x %d)\n", fPath.c_str(),
decodeInfo.width(), decodeInfo.height());
}
switch (fMode) {
case kScaledCodec_Mode:
case kCodec_Mode: {
switch (codec->getPixels(decodeInfo, bitmap.getPixels(), bitmap.rowBytes(), nullptr,
colorPtr, colorCountPtr)) {
case SkCodec::kSuccess:
// We consider incomplete to be valid, since we should still decode what is
// available.
case SkCodec::kIncompleteInput:
break;
case SkCodec::kInvalidConversion:
return Error::Nonfatal("Incompatible colortype conversion");
default:
// Everything else is considered a failure.
return SkStringPrintf("Couldn't getPixels %s.", fPath.c_str());
}
canvas->drawBitmap(bitmap, 0, 0);
break;
}
case kScanline_Mode: {
if (SkCodec::kSuccess != codec->startScanlineDecode(decodeInfo, NULL, colorPtr,
colorCountPtr)) {
return Error::Nonfatal("Could not start scanline decoder");
}
void* dst = bitmap.getAddr(0, 0);
size_t rowBytes = bitmap.rowBytes();
uint32_t height = decodeInfo.height();
switch (codec->getScanlineOrder()) {
case SkCodec::kTopDown_SkScanlineOrder:
case SkCodec::kBottomUp_SkScanlineOrder:
case SkCodec::kNone_SkScanlineOrder:
// We do not need to check the return value. On an incomplete
// image, memory will be filled with a default value.
codec->getScanlines(dst, height, rowBytes);
break;
case SkCodec::kOutOfOrder_SkScanlineOrder: {
for (int y = 0; y < decodeInfo.height(); y++) {
int dstY = codec->outputScanline(y);
void* dstPtr = bitmap.getAddr(0, dstY);
// We complete the loop, even if this call begins to fail
// due to an incomplete image. This ensures any uninitialized
// memory will be filled with the proper value.
codec->getScanlines(dstPtr, 1, bitmap.rowBytes());
}
break;
}
}
canvas->drawBitmap(bitmap, 0, 0);
break;
}
case kScanline_Subset_Mode: {
//this mode decodes the image in divisor*divisor subsets, using a scanline decoder
const int divisor = 2;
const int w = decodeInfo.width();
const int h = decodeInfo.height();
if (divisor > w || divisor > h) {
return Error::Nonfatal(SkStringPrintf("Cannot decode subset: divisor %d is too big"
"for %s with dimensions (%d x %d)", divisor, fPath.c_str(), w, h));
}
const int subsetWidth = w/divisor;
const int subsetHeight = h/divisor;
// One of our subsets will be larger to contain any pixels that do not divide evenly.
const int extraX = w % divisor;
const int extraY = h % divisor;
/*
* if w or h are not evenly divided by divisor need to adjust width and height of end
* subsets to cover entire image.
* Add extraX and extraY to largestSubsetBm's width and height to adjust width
* and height of end subsets.
* subsetBm is extracted from largestSubsetBm.
* subsetBm's size is determined based on the current subset and may be larger for end
* subsets.
*/
SkImageInfo largestSubsetDecodeInfo =
decodeInfo.makeWH(subsetWidth + extraX, subsetHeight + extraY);
SkBitmap largestSubsetBm;
if (!largestSubsetBm.tryAllocPixels(largestSubsetDecodeInfo, nullptr,
colorTable.get())) {
return SkStringPrintf("Image(%s) is too large (%d x %d)\n", fPath.c_str(),
largestSubsetDecodeInfo.width(), largestSubsetDecodeInfo.height());
}
const size_t rowBytes = decodeInfo.minRowBytes();
char* buffer = new char[largestSubsetDecodeInfo.height() * rowBytes];
SkAutoTDeleteArray<char> lineDeleter(buffer);
for (int col = 0; col < divisor; col++) {
//currentSubsetWidth may be larger than subsetWidth for rightmost subsets
const int currentSubsetWidth = (col + 1 == divisor) ?
subsetWidth + extraX : subsetWidth;
const int x = col * subsetWidth;
for (int row = 0; row < divisor; row++) {
//currentSubsetHeight may be larger than subsetHeight for bottom subsets
const int currentSubsetHeight = (row + 1 == divisor) ?
subsetHeight + extraY : subsetHeight;
const int y = row * subsetHeight;
//create scanline decoder for each subset
if (SkCodec::kSuccess != codec->startScanlineDecode(decodeInfo, NULL, colorPtr,
colorCountPtr)
// TODO (msarett): Support this mode for all scanline orderings.
|| SkCodec::kTopDown_SkScanlineOrder != codec->getScanlineOrder()) {
if (x == 0 && y == 0) {
//first try, image may not be compatible
return Error::Nonfatal("Could not start top-down scanline decoder");
} else {
return "Error scanline decoder is nullptr";
}
}
// Skip to the first line of subset. We ignore the result value here.
// If the skip value fails, this will indicate an incomplete image.
// This means that the call to getScanlines() will also fail, but it
// will fill the buffer with a default value, so we can still draw the
// image.
codec->skipScanlines(y);
//create and set size of subsetBm
SkBitmap subsetBm;
SkIRect bounds = SkIRect::MakeWH(currentSubsetWidth, currentSubsetHeight);
SkAssertResult(largestSubsetBm.extractSubset(&subsetBm, bounds));
SkAutoLockPixels autlockSubsetBm(subsetBm, true);
codec->getScanlines(buffer, currentSubsetHeight, rowBytes);
const size_t bpp = decodeInfo.bytesPerPixel();
char* bufferRow = buffer;
for (int subsetY = 0; subsetY < currentSubsetHeight; ++subsetY) {
memcpy(subsetBm.getAddr(0, subsetY), bufferRow + x*bpp,
currentSubsetWidth*bpp);
bufferRow += rowBytes;
}
subsetBm.notifyPixelsChanged();
canvas->drawBitmap(subsetBm, SkIntToScalar(x), SkIntToScalar(y));
}
}
break;
}
case kStripe_Mode: {
const int height = decodeInfo.height();
// This value is chosen arbitrarily. We exercise more cases by choosing a value that
// does not align with image blocks.
const int stripeHeight = 37;
const int numStripes = (height + stripeHeight - 1) / stripeHeight;
// Decode odd stripes
if (SkCodec::kSuccess != codec->startScanlineDecode(decodeInfo, NULL, colorPtr,
colorCountPtr)
|| SkCodec::kTopDown_SkScanlineOrder != codec->getScanlineOrder()) {
// This mode was designed to test the new skip scanlines API in libjpeg-turbo.
// Jpegs have kTopDown_SkScanlineOrder, and at this time, it is not interesting
// to run this test for image types that do not have this scanline ordering.
return Error::Nonfatal("Could not start top-down scanline decoder");
}
for (int i = 0; i < numStripes; i += 2) {
// Skip a stripe
const int linesToSkip = SkTMin(stripeHeight, height - i * stripeHeight);
codec->skipScanlines(linesToSkip);
// Read a stripe
const int startY = (i + 1) * stripeHeight;
const int linesToRead = SkTMin(stripeHeight, height - startY);
if (linesToRead > 0) {
codec->getScanlines(bitmap.getAddr(0, startY), linesToRead, bitmap.rowBytes());
}
}
// Decode even stripes
const SkCodec::Result startResult = codec->startScanlineDecode(decodeInfo, nullptr,
colorPtr, colorCountPtr);
if (SkCodec::kSuccess != startResult) {
return "Failed to restart scanline decoder with same parameters.";
}
for (int i = 0; i < numStripes; i += 2) {
// Read a stripe
const int startY = i * stripeHeight;
const int linesToRead = SkTMin(stripeHeight, height - startY);
codec->getScanlines(bitmap.getAddr(0, startY), linesToRead, bitmap.rowBytes());
// Skip a stripe
const int linesToSkip = SkTMin(stripeHeight, height - (i + 1) * stripeHeight);
if (linesToSkip > 0) {
codec->skipScanlines(linesToSkip);
}
}
canvas->drawBitmap(bitmap, 0, 0);
break;
}
case kSubset_Mode: {
// Arbitrarily choose a divisor.
int divisor = 2;
// Total width/height of the image.
const int W = codec->getInfo().width();
const int H = codec->getInfo().height();
if (divisor > W || divisor > H) {
return Error::Nonfatal(SkStringPrintf("Cannot codec subset: divisor %d is too big "
"for %s with dimensions (%d x %d)", divisor,
fPath.c_str(), W, H));
}
// subset dimensions
// SkWebpCodec, the only one that supports subsets, requires even top/left boundaries.
const int w = SkAlign2(W / divisor);
const int h = SkAlign2(H / divisor);
SkIRect subset;
SkCodec::Options opts;
opts.fSubset = &subset;
SkBitmap subsetBm;
// We will reuse pixel memory from bitmap.
void* pixels = bitmap.getPixels();
// Keep track of left and top (for drawing subsetBm into canvas). We could use
// fScale * x and fScale * y, but we want integers such that the next subset will start
// where the last one ended. So we'll add decodeInfo.width() and height().
int left = 0;
for (int x = 0; x < W; x += w) {
int top = 0;
for (int y = 0; y < H; y+= h) {
// Do not make the subset go off the edge of the image.
const int preScaleW = SkTMin(w, W - x);
const int preScaleH = SkTMin(h, H - y);
subset.setXYWH(x, y, preScaleW, preScaleH);
// And scale
// FIXME: Should we have a version of getScaledDimensions that takes a subset
// into account?
decodeInfo = decodeInfo.makeWH(
SkTMax(1, SkScalarRoundToInt(preScaleW * fScale)),
SkTMax(1, SkScalarRoundToInt(preScaleH * fScale)));
size_t rowBytes = decodeInfo.minRowBytes();
if (!subsetBm.installPixels(decodeInfo, pixels, rowBytes, colorTable.get(),
nullptr, nullptr)) {
return SkStringPrintf("could not install pixels for %s.", fPath.c_str());
}
const SkCodec::Result result = codec->getPixels(decodeInfo, pixels, rowBytes,
&opts, colorPtr, colorCountPtr);
switch (result) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
case SkCodec::kInvalidConversion:
if (0 == (x|y)) {
// First subset is okay to return unimplemented.
return Error::Nonfatal("Incompatible colortype conversion");
}
// If the first subset succeeded, a later one should not fail.
// fall through to failure
case SkCodec::kUnimplemented:
if (0 == (x|y)) {
// First subset is okay to return unimplemented.
return Error::Nonfatal("subset codec not supported");
}
// If the first subset succeeded, why would a later one fail?
// fall through to failure
default:
return SkStringPrintf("subset codec failed to decode (%d, %d, %d, %d) "
"from %s with dimensions (%d x %d)\t error %d",
x, y, decodeInfo.width(), decodeInfo.height(),
fPath.c_str(), W, H, result);
}
canvas->drawBitmap(subsetBm, SkIntToScalar(left), SkIntToScalar(top));
// translate by the scaled height.
top += decodeInfo.height();
}
// translate by the scaled width.
left += decodeInfo.width();
}
return "";
}
}
return "";
}
SkISize CodecSrc::size() const {
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
SkAutoTDelete<SkCodec> codec(nullptr);
if (kScaledCodec_Mode == fMode) {
codec.reset(SkScaledCodec::NewFromData(encoded));
} else {
codec.reset(SkCodec::NewFromData(encoded));
}
if (nullptr == codec) {
return SkISize::Make(0, 0);
}
return codec->getScaledDimensions(fScale);
}
Name CodecSrc::name() const {
if (1.0f == fScale) {
return SkOSPath::Basename(fPath.c_str());
}
return get_scaled_name(fPath, fScale);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
ImageSrc::ImageSrc(Path path, int divisor) : fPath(path), fDivisor(divisor) {}
bool ImageSrc::veto(SinkFlags flags) const {
// No need to test decoding to non-raster or indirect backend.
// TODO: Instead, use lazy decoding to allow the GPU to handle cases like YUV.
return flags.type != SinkFlags::kRaster
|| flags.approach != SinkFlags::kDirect;
}
Error ImageSrc::draw(SkCanvas* canvas) const {
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
if (!encoded) {
return SkStringPrintf("Couldn't read %s.", fPath.c_str());
}
const SkColorType dstColorType = canvas->imageInfo().colorType();
if (fDivisor == 0) {
// Decode the full image.
SkBitmap bitmap;
if (!SkImageDecoder::DecodeMemory(encoded->data(), encoded->size(), &bitmap,
dstColorType, SkImageDecoder::kDecodePixels_Mode)) {
return SkStringPrintf("Couldn't decode %s.", fPath.c_str());
}
if (kRGB_565_SkColorType == dstColorType && !bitmap.isOpaque()) {
// Do not draw a bitmap with alpha to a destination without alpha.
return Error::Nonfatal("Uninteresting to decode image with alpha into 565.");
}
encoded.reset((SkData*)nullptr); // Might as well drop this when we're done with it.
canvas->drawBitmap(bitmap, 0,0);
return "";
}
// Decode subsets. This is a little involved.
SkAutoTDelete<SkMemoryStream> stream(new SkMemoryStream(encoded));
SkAutoTDelete<SkImageDecoder> decoder(SkImageDecoder::Factory(stream.get()));
if (!decoder) {
return SkStringPrintf("Can't find a good decoder for %s.", fPath.c_str());
}
stream->rewind();
int w,h;
if (!decoder->buildTileIndex(stream.detach(), &w, &h)) {
return Error::Nonfatal("Subset decoding not supported.");
}
// Divide the image into subsets that cover the entire image.
if (fDivisor > w || fDivisor > h) {
return Error::Nonfatal(SkStringPrintf("Cannot decode subset: divisor %d is too big"
"for %s with dimensions (%d x %d)", fDivisor, fPath.c_str(), w, h));
}
const int subsetWidth = w / fDivisor,
subsetHeight = h / fDivisor;
for (int y = 0; y < h; y += subsetHeight) {
for (int x = 0; x < w; x += subsetWidth) {
SkBitmap subset;
SkIRect rect = SkIRect::MakeXYWH(x, y, subsetWidth, subsetHeight);
if (!decoder->decodeSubset(&subset, rect, dstColorType)) {
return SkStringPrintf("Could not decode subset (%d, %d, %d, %d).",
x, y, x+subsetWidth, y+subsetHeight);
}
if (kRGB_565_SkColorType == dstColorType && !subset.isOpaque()) {
// Do not draw a bitmap with alpha to a destination without alpha.
// This is not an error, but there is nothing interesting to show.
// This should only happen on the first iteration through the loop.
SkASSERT(0 == x && 0 == y);
return Error::Nonfatal("Uninteresting to decode image with alpha into 565.");
}
canvas->drawBitmap(subset, SkIntToScalar(x), SkIntToScalar(y));
}
}
return "";
}
SkISize ImageSrc::size() const {
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
SkBitmap bitmap;
if (!encoded || !SkImageDecoder::DecodeMemory(encoded->data(),
encoded->size(),
&bitmap,
kUnknown_SkColorType,
SkImageDecoder::kDecodeBounds_Mode)) {
return SkISize::Make(0,0);
}
return bitmap.dimensions();
}
Name ImageSrc::name() const {
return SkOSPath::Basename(fPath.c_str());
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
static const SkRect kSKPViewport = {0,0, 1000,1000};
SKPSrc::SKPSrc(Path path) : fPath(path) {}
Error SKPSrc::draw(SkCanvas* canvas) const {
SkAutoTDelete<SkStream> stream(SkStream::NewFromFile(fPath.c_str()));
if (!stream) {
return SkStringPrintf("Couldn't read %s.", fPath.c_str());
}
SkAutoTUnref<SkPicture> pic(SkPicture::CreateFromStream(stream, &lazy_decode_bitmap));
if (!pic) {
return SkStringPrintf("Couldn't decode %s as a picture.", fPath.c_str());
}
stream.reset((SkStream*)nullptr); // Might as well drop this when we're done with it.
canvas->clipRect(kSKPViewport);
canvas->drawPicture(pic);
return "";
}
SkISize SKPSrc::size() const {
SkAutoTDelete<SkStream> stream(SkStream::NewFromFile(fPath.c_str()));
if (!stream) {
return SkISize::Make(0,0);
}
SkPictInfo info;
if (!SkPicture::InternalOnly_StreamIsSKP(stream, &info)) {
return SkISize::Make(0,0);
}
SkRect viewport = kSKPViewport;
if (!viewport.intersect(info.fCullRect)) {
return SkISize::Make(0,0);
}
return viewport.roundOut().size();
}
Name SKPSrc::name() const { return SkOSPath::Basename(fPath.c_str()); }
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
Error NullSink::draw(const Src& src, SkBitmap*, SkWStream*, SkString*) const {
SkAutoTDelete<SkCanvas> canvas(SkCreateNullCanvas());
return src.draw(canvas);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
DEFINE_bool(gpuStats, false, "Append GPU stats to the log for each GPU task?");
GPUSink::GPUSink(GrContextFactory::GLContextType ct,
GrGLStandard api,
int samples,
bool diText,
bool threaded)
: fContextType(ct)
, fGpuAPI(api)
, fSampleCount(samples)
, fUseDIText(diText)
, fThreaded(threaded) {}
int GPUSink::enclave() const {
return fThreaded ? kAnyThread_Enclave : kGPU_Enclave;
}
void PreAbandonGpuContextErrorHandler(SkError, void*) {}
Error GPUSink::draw(const Src& src, SkBitmap* dst, SkWStream*, SkString* log) const {
GrContextOptions options;
src.modifyGrContextOptions(&options);
GrContextFactory factory(options);
const SkISize size = src.size();
const SkImageInfo info =
SkImageInfo::Make(size.width(), size.height(), kN32_SkColorType, kPremul_SkAlphaType);
SkAutoTUnref<SkSurface> surface(
NewGpuSurface(&factory, fContextType, fGpuAPI, info, fSampleCount, fUseDIText));
if (!surface) {
return "Could not create a surface.";
}
if (FLAGS_preAbandonGpuContext) {
SkSetErrorCallback(&PreAbandonGpuContextErrorHandler, nullptr);
factory.abandonContexts();
}
SkCanvas* canvas = surface->getCanvas();
Error err = src.draw(canvas);
if (!err.isEmpty()) {
return err;
}
canvas->flush();
if (FLAGS_gpuStats) {
canvas->getGrContext()->dumpCacheStats(log);
canvas->getGrContext()->dumpGpuStats(log);
}
dst->allocPixels(info);
canvas->readPixels(dst, 0, 0);
if (FLAGS_abandonGpuContext) {
factory.abandonContexts();
}
return "";
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
static Error draw_skdocument(const Src& src, SkDocument* doc, SkWStream* dst) {
// Print the given DM:Src to a document, breaking on 8.5x11 pages.
SkASSERT(doc);
int width = src.size().width(),
height = src.size().height();
if (FLAGS_multiPage) {
const int kLetterWidth = 612, // 8.5 * 72
kLetterHeight = 792; // 11 * 72
const SkRect letter = SkRect::MakeWH(SkIntToScalar(kLetterWidth),
SkIntToScalar(kLetterHeight));
int xPages = ((width - 1) / kLetterWidth) + 1;
int yPages = ((height - 1) / kLetterHeight) + 1;
for (int y = 0; y < yPages; ++y) {
for (int x = 0; x < xPages; ++x) {
int w = SkTMin(kLetterWidth, width - (x * kLetterWidth));
int h = SkTMin(kLetterHeight, height - (y * kLetterHeight));
SkCanvas* canvas =
doc->beginPage(SkIntToScalar(w), SkIntToScalar(h));
if (!canvas) {
return "SkDocument::beginPage(w,h) returned nullptr";
}
canvas->clipRect(letter);
canvas->translate(-letter.width() * x, -letter.height() * y);
Error err = src.draw(canvas);
if (!err.isEmpty()) {
return err;
}
doc->endPage();
}
}
} else {
SkCanvas* canvas =
doc->beginPage(SkIntToScalar(width), SkIntToScalar(height));
if (!canvas) {
return "SkDocument::beginPage(w,h) returned nullptr";
}
Error err = src.draw(canvas);
if (!err.isEmpty()) {
return err;
}
doc->endPage();
}
if (!doc->close()) {
return "SkDocument::close() returned false";
}
dst->flush();
return "";
}
PDFSink::PDFSink(const char* rasterizer) : fRasterizer(rasterizer) {}
Error PDFSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
SkAutoTUnref<SkDocument> doc(SkDocument::CreatePDF(dst));
if (!doc) {
return "SkDocument::CreatePDF() returned nullptr";
}
SkTArray<SkDocument::Attribute> info;
info.emplace_back(SkString("Title"), src.name());
info.emplace_back(SkString("Subject"),
SkString("rendering correctness test"));
info.emplace_back(SkString("Creator"), SkString("Skia/DM"));
info.emplace_back(SkString("Keywords"),
SkStringPrintf("Rasterizer:%s;", fRasterizer));
doc->setMetadata(info, nullptr, nullptr);
return draw_skdocument(src, doc.get(), dst);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
XPSSink::XPSSink() {}
Error XPSSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
SkAutoTUnref<SkDocument> doc(SkDocument::CreateXPS(dst));
if (!doc) {
return "SkDocument::CreateXPS() returned nullptr";
}
return draw_skdocument(src, doc.get(), dst);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
SKPSink::SKPSink() {}
Error SKPSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
SkSize size;
size = src.size();
SkPictureRecorder recorder;
Error err = src.draw(recorder.beginRecording(size.width(), size.height()));
if (!err.isEmpty()) {
return err;
}
SkAutoTUnref<SkPicture> pic(recorder.endRecording());
pic->serialize(dst);
return "";
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
SVGSink::SVGSink() {}
Error SVGSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
SkAutoTDelete<SkXMLWriter> xmlWriter(new SkXMLStreamWriter(dst));
SkAutoTUnref<SkCanvas> canvas(SkSVGCanvas::Create(
SkRect::MakeWH(SkIntToScalar(src.size().width()), SkIntToScalar(src.size().height())),
xmlWriter));
return src.draw(canvas);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
RasterSink::RasterSink(SkColorType colorType) : fColorType(colorType) {}
Error RasterSink::draw(const Src& src, SkBitmap* dst, SkWStream*, SkString*) const {
const SkISize size = src.size();
// If there's an appropriate alpha type for this color type, use it, otherwise use premul.
SkAlphaType alphaType = kPremul_SkAlphaType;
(void)SkColorTypeValidateAlphaType(fColorType, alphaType, &alphaType);
dst->allocPixels(SkImageInfo::Make(size.width(), size.height(), fColorType, alphaType));
dst->eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(*dst);
return src.draw(&canvas);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
// Handy for front-patching a Src. Do whatever up-front work you need, then call draw_to_canvas(),
// passing the Sink draw() arguments, a size, and a function draws into an SkCanvas.
// Several examples below.
static Error draw_to_canvas(Sink* sink, SkBitmap* bitmap, SkWStream* stream, SkString* log,
SkISize size, SkFunction<Error(SkCanvas*)> draw) {
class ProxySrc : public Src {
public:
ProxySrc(SkISize size, SkFunction<Error(SkCanvas*)> draw) : fSize(size), fDraw(draw) {}
Error draw(SkCanvas* canvas) const override { return fDraw(canvas); }
Name name() const override { sk_throw(); return ""; } // Won't be called.
SkISize size() const override { return fSize; }
private:
SkISize fSize;
SkFunction<Error(SkCanvas*)> fDraw;
};
return sink->draw(ProxySrc(size, draw), bitmap, stream, log);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
static SkISize auto_compute_translate(SkMatrix* matrix, int srcW, int srcH) {
SkRect bounds = SkRect::MakeIWH(srcW, srcH);
matrix->mapRect(&bounds);
matrix->postTranslate(-bounds.x(), -bounds.y());
return SkISize::Make(SkScalarRoundToInt(bounds.width()), SkScalarRoundToInt(bounds.height()));
}
ViaMatrix::ViaMatrix(SkMatrix matrix, Sink* sink) : Via(sink), fMatrix(matrix) {}
Error ViaMatrix::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
SkMatrix matrix = fMatrix;
SkISize size = auto_compute_translate(&matrix, src.size().width(), src.size().height());
return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
canvas->concat(matrix);
return src.draw(canvas);
});
}
// Undoes any flip or 90 degree rotate without changing the scale of the bitmap.
// This should be pixel-preserving.
ViaUpright::ViaUpright(SkMatrix matrix, Sink* sink) : Via(sink), fMatrix(matrix) {}
Error ViaUpright::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
Error err = fSink->draw(src, bitmap, stream, log);
if (!err.isEmpty()) {
return err;
}
SkMatrix inverse;
if (!fMatrix.rectStaysRect() || !fMatrix.invert(&inverse)) {
return "Cannot upright --matrix.";
}
SkMatrix upright = SkMatrix::I();
upright.setScaleX(SkScalarSignAsScalar(inverse.getScaleX()));
upright.setScaleY(SkScalarSignAsScalar(inverse.getScaleY()));
upright.setSkewX(SkScalarSignAsScalar(inverse.getSkewX()));
upright.setSkewY(SkScalarSignAsScalar(inverse.getSkewY()));
SkBitmap uprighted;
SkISize size = auto_compute_translate(&upright, bitmap->width(), bitmap->height());
uprighted.allocPixels(bitmap->info().makeWH(size.width(), size.height()));
SkCanvas canvas(uprighted);
canvas.concat(upright);
SkPaint paint;
paint.setXfermodeMode(SkXfermode::kSrc_Mode);
canvas.drawBitmap(*bitmap, 0, 0, &paint);
*bitmap = uprighted;
bitmap->lockPixels();
return "";
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
Error ViaPipe::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
auto size = src.size();
return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
PipeController controller(canvas, &SkImageDecoder::DecodeMemory);
SkGPipeWriter pipe;
const uint32_t kFlags = 0;
return src.draw(pipe.startRecording(&controller, kFlags, size.width(), size.height()));
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
Error ViaSerialization::draw(
const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
// Record our Src into a picture.
auto size = src.size();
SkPictureRecorder recorder;
Error err = src.draw(recorder.beginRecording(SkIntToScalar(size.width()),
SkIntToScalar(size.height())));
if (!err.isEmpty()) {
return err;
}
SkAutoTUnref<SkPicture> pic(recorder.endRecording());
// Serialize it and then deserialize it.
SkDynamicMemoryWStream wStream;
pic->serialize(&wStream);
SkAutoTDelete<SkStream> rStream(wStream.detachAsStream());
SkAutoTUnref<SkPicture> deserialized(SkPicture::CreateFromStream(rStream, &lazy_decode_bitmap));
return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) {
canvas->drawPicture(deserialized);
return "";
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
ViaTiles::ViaTiles(int w, int h, SkBBHFactory* factory, Sink* sink)
: Via(sink)
, fW(w)
, fH(h)
, fFactory(factory) {}
Error ViaTiles::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
auto size = src.size();
SkPictureRecorder recorder;
Error err = src.draw(recorder.beginRecording(SkIntToScalar(size.width()),
SkIntToScalar(size.height()),
fFactory.get()));
if (!err.isEmpty()) {
return err;
}
SkAutoTUnref<SkPicture> pic(recorder.endRecordingAsPicture());
return draw_to_canvas(fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) {
const int xTiles = (size.width() + fW - 1) / fW,
yTiles = (size.height() + fH - 1) / fH;
SkMultiPictureDraw mpd(xTiles*yTiles);
SkTDArray<SkSurface*> surfaces;
surfaces.setReserve(xTiles*yTiles);
SkImageInfo info = canvas->imageInfo().makeWH(fW, fH);
for (int j = 0; j < yTiles; j++) {
for (int i = 0; i < xTiles; i++) {
// This lets our ultimate Sink determine the best kind of surface.
// E.g., if it's a GpuSink, the surfaces and images are textures.
SkSurface* s = canvas->newSurface(info);
if (!s) {
s = SkSurface::NewRaster(info); // Some canvases can't create surfaces.
}
surfaces.push(s);
SkCanvas* c = s->getCanvas();
c->translate(SkIntToScalar(-i * fW),
SkIntToScalar(-j * fH)); // Line up the canvas with this tile.
mpd.add(c, pic);
}
}
mpd.draw();
for (int j = 0; j < yTiles; j++) {
for (int i = 0; i < xTiles; i++) {
SkAutoTUnref<SkImage> image(surfaces[i+xTiles*j]->newImageSnapshot());
canvas->drawImage(image, SkIntToScalar(i*fW), SkIntToScalar(j*fH));
}
}
surfaces.unrefAll();
return "";
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
// Draw the Src into two pictures, then draw the second picture into the wrapped Sink.
// This tests that any shortcuts we may take while recording that second picture are legal.
Error ViaSecondPicture::draw(
const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
auto size = src.size();
return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
SkPictureRecorder recorder;
SkAutoTUnref<SkPicture> pic;
for (int i = 0; i < 2; i++) {
Error err = src.draw(recorder.beginRecording(SkIntToScalar(size.width()),
SkIntToScalar(size.height())));
if (!err.isEmpty()) {
return err;
}
pic.reset(recorder.endRecordingAsPicture());
}
canvas->drawPicture(pic);
return "";
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
// Draw the Src twice. This can help exercise caching.
Error ViaTwice::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
return draw_to_canvas(fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) -> Error {
for (int i = 0; i < 2; i++) {
SkAutoCanvasRestore acr(canvas, true/*save now*/);
canvas->clear(SK_ColorTRANSPARENT);
Error err = src.draw(canvas);
if (err.isEmpty()) {
return err;
}
}
return "";
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
// This is like SkRecords::Draw, in that it plays back SkRecords ops into a Canvas.
// Unlike SkRecords::Draw, it builds a single-op sub-picture out of each Draw-type op.
// This is an only-slightly-exaggerated simluation of Blink's Slimming Paint pictures.
struct DrawsAsSingletonPictures {
SkCanvas* fCanvas;
const SkDrawableList& fDrawables;
template <typename T>
void draw(const T& op, SkCanvas* canvas) {
// We must pass SkMatrix::I() as our initial matrix.
// By default SkRecords::Draw() uses the canvas' matrix as its initial matrix,
// which would have the funky effect of applying transforms over and over.
SkRecords::Draw d(canvas, nullptr, fDrawables.begin(), fDrawables.count(), &SkMatrix::I());
d(op);
}
// Draws get their own picture.
template <typename T>
SK_WHEN(T::kTags & SkRecords::kDraw_Tag, void) operator()(const T& op) {
SkPictureRecorder rec;
this->draw(op, rec.beginRecording(SkRect::MakeLargest()));
SkAutoTUnref<SkPicture> pic(rec.endRecordingAsPicture());
fCanvas->drawPicture(pic);
}
// We'll just issue non-draws directly.
template <typename T>
skstd::enable_if_t<!(T::kTags & SkRecords::kDraw_Tag), void> operator()(const T& op) {
this->draw(op, fCanvas);
}
};
// Record Src into a picture, then record it into a macro picture with a sub-picture for each draw.
// Then play back that macro picture into our wrapped sink.
Error ViaSingletonPictures::draw(
const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
auto size = src.size();
return draw_to_canvas(fSink, bitmap, stream, log, size, [&](SkCanvas* canvas) -> Error {
// Use low-level (Skia-private) recording APIs so we can read the SkRecord.
SkRecord skr;
SkRecorder recorder(&skr, size.width(), size.height());
Error err = src.draw(&recorder);
if (!err.isEmpty()) {
return err;
}
// Record our macro-picture, with each draw op as its own sub-picture.
SkPictureRecorder macroRec;
SkCanvas* macroCanvas = macroRec.beginRecording(SkIntToScalar(size.width()),
SkIntToScalar(size.height()));
SkAutoTDelete<SkDrawableList> drawables(recorder.detachDrawableList());
const SkDrawableList empty;
DrawsAsSingletonPictures drawsAsSingletonPictures = {
macroCanvas,
drawables ? *drawables : empty,
};
for (int i = 0; i < skr.count(); i++) {
skr.visit<void>(i, drawsAsSingletonPictures);
}
SkAutoTUnref<SkPicture> macroPic(macroRec.endRecordingAsPicture());
canvas->drawPicture(macroPic);
return "";
});
}
} // namespace DM
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