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skia2/dm/DMSrcSink.cpp
scroggo b636b45971 Add the ability to decode a subset to SkCodec 
This allows codecs that support subsets natively (i.e. WEBP) to do so.

Add a field on SkCodec::Options representing the subset.

Add a method on SkCodec to find a valid subset which approximately
matches a desired subset.

Implement subset decodes in SkWebpCodec.

Add a test in DM for decoding subsets.
Notice that we only start on even boundaries. This is due to the
way libwebp's API works. SkWEBPImageDecoder does not take this into
account, which results in visual artifacts.

FIXME: Subsets with scaling are not pixel identical, but close. (This
may be fine, though - they are not perceptually different. We'll just
need to mark another set of images in gold as valid, once
https://skbug.com/4038 is fixed, so we can tests scaled webp without
generating new images on each run.)

Review URL: https://codereview.chromium.org/1240143002
2015-07-22 07:16:20 -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 "SkCommonFlags.h"
#include "SkData.h"
#include "SkDeferredCanvas.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 "SkScanlineDecoder.h"
#include "SkStream.h"
#include "SkXMLWriter.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 && SkInstallDiscardablePixelRef(encoded, dst);
}
namespace DM {
GMSrc::GMSrc(skiagm::GMRegistry::Factory factory) : fFactory(factory) {}
Error GMSrc::draw(SkCanvas* canvas) const {
SkAutoTDelete<skiagm::GM> gm(fFactory(NULL));
canvas->concat(gm->getInitialTransform());
gm->draw(canvas);
return "";
}
SkISize GMSrc::size() const {
SkAutoTDelete<skiagm::GM> gm(fFactory(NULL));
return gm->getISize();
}
Name GMSrc::name() const {
SkAutoTDelete<skiagm::GM> gm(fFactory(NULL));
return gm->getName();
}
void GMSrc::modifyGrContextOptions(GrContextOptions* options) const {
SkAutoTDelete<skiagm::GM> gm(fFactory(NULL));
gm->modifyGrContextOptions(options);
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
CodecSrc::CodecSrc(Path path, Mode mode, DstColorType dstColorType, float scale)
: fPath(path)
, fMode(mode)
, fDstColorType(dstColorType)
, fScale(scale)
{}
Error CodecSrc::draw(SkCanvas* canvas) const {
SkImageInfo canvasInfo;
if (NULL == canvas->peekPixels(&canvasInfo, NULL)) {
// TODO: Once we implement GPU paths (e.g. JPEG YUV), we should use a deferred decode to
// let the GPU handle it.
return Error::Nonfatal("No need to test decoding to non-raster backend.");
}
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
if (!encoded) {
return SkStringPrintf("Couldn't read %s.", fPath.c_str());
}
SkAutoTDelete<SkCodec> codec(SkCodec::NewFromData(encoded));
if (NULL == 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 = canvasInfo.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.");
}
decodeInfo = decodeInfo.makeWH(size.width(), size.height());
// Construct a color table for the decode if necessary
SkAutoTUnref<SkColorTable> colorTable(NULL);
SkPMColor* colorPtr = NULL;
int* colorCountPtr = NULL;
int maxColors = 256;
if (kIndex_8_SkColorType == decodeInfo.colorType()) {
SkPMColor colors[256];
colorTable.reset(SkNEW_ARGS(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, NULL, colorTable.get())) {
return SkStringPrintf("Image(%s) is too large (%d x %d)\n", fPath.c_str(),
decodeInfo.width(), decodeInfo.height());
}
switch (fMode) {
case kNormal_Mode: {
switch (codec->getPixels(decodeInfo, bitmap.getPixels(), bitmap.rowBytes(), NULL,
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: {
SkAutoTDelete<SkScanlineDecoder> scanlineDecoder(codec->getScanlineDecoder(
decodeInfo, NULL, colorPtr, colorCountPtr));
if (NULL == scanlineDecoder) {
return Error::Nonfatal("Cannot use scanline decoder for all images");
}
const SkCodec::Result result = scanlineDecoder->getScanlines(
bitmap.getAddr(0, 0), decodeInfo.height(), bitmap.rowBytes());
switch (result) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("%s failed with error message %d",
fPath.c_str(), (int) result);
}
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, NULL, 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 = SkNEW_ARRAY(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
SkAutoTDelete<SkScanlineDecoder> subsetScanlineDecoder(
codec->getScanlineDecoder(decodeInfo, NULL, colorPtr, colorCountPtr));
if (NULL == subsetScanlineDecoder) {
if (x == 0 && y == 0) {
//first try, image may not be compatible
return Error::Nonfatal("Cannot use scanline decoder for all images");
} else {
return "Error scanline decoder is NULL";
}
}
//skip to first line of subset
const SkCodec::Result skipResult =
subsetScanlineDecoder->skipScanlines(y);
switch (skipResult) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("%s failed after attempting to skip %d scanlines"
"with error message %d", fPath.c_str(), y, (int) skipResult);
}
//create and set size of subsetBm
SkBitmap subsetBm;
SkIRect bounds = SkIRect::MakeWH(subsetWidth, subsetHeight);
bounds.setXYWH(0, 0, currentSubsetWidth, currentSubsetHeight);
SkAssertResult(largestSubsetBm.extractSubset(&subsetBm, bounds));
SkAutoLockPixels autlockSubsetBm(subsetBm, true);
const SkCodec::Result subsetResult =
subsetScanlineDecoder->getScanlines(buffer, currentSubsetHeight, rowBytes);
switch (subsetResult) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("%s failed with error message %d",
fPath.c_str(), (int) subsetResult);
}
const size_t bpp = decodeInfo.bytesPerPixel();
/*
* we copy all the lines at once becuase when calling getScanlines for
* interlaced pngs the entire image must be read regardless of the number
* of lines requested. Reading an interlaced png in a loop, line-by-line, would
* decode the entire image height times, which is very slow
* it is aknowledged that copying each line as you read it in a loop
* may be faster for other types of images. Since this is a correctness test
* that's okay.
*/
char* bufferRow = buffer;
for (int subsetY = 0; subsetY < currentSubsetHeight; ++subsetY) {
memcpy(subsetBm.getAddr(0, subsetY), bufferRow + x*bpp,
currentSubsetWidth*bpp);
bufferRow += rowBytes;
}
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
SkAutoTDelete<SkScanlineDecoder> decoder(
codec->getScanlineDecoder(decodeInfo, NULL, colorPtr, colorCountPtr));
if (NULL == decoder) {
return Error::Nonfatal("Cannot use scanline decoder for all images");
}
for (int i = 0; i < numStripes; i += 2) {
// Skip a stripe
const int linesToSkip = SkTMin(stripeHeight, height - i * stripeHeight);
SkCodec::Result result = decoder->skipScanlines(linesToSkip);
switch (result) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("Cannot skip scanlines for %s.", fPath.c_str());
}
// Read a stripe
const int startY = (i + 1) * stripeHeight;
const int linesToRead = SkTMin(stripeHeight, height - startY);
if (linesToRead > 0) {
result = decoder->getScanlines(bitmap.getAddr(0, startY),
linesToRead, bitmap.rowBytes());
switch (result) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("Cannot get scanlines for %s.", fPath.c_str());
}
}
}
// Decode even stripes
decoder.reset(codec->getScanlineDecoder(decodeInfo, NULL, colorPtr, colorCountPtr));
if (NULL == decoder) {
return "Failed to create second scanline decoder.";
}
for (int i = 0; i < numStripes; i += 2) {
// Read a stripe
const int startY = i * stripeHeight;
const int linesToRead = SkTMin(stripeHeight, height - startY);
SkCodec::Result result = decoder->getScanlines(bitmap.getAddr(0, startY),
linesToRead, bitmap.rowBytes());
switch (result) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("Cannot get scanlines for %s.", fPath.c_str());
}
// Skip a stripe
const int linesToSkip = SkTMin(stripeHeight, height - (i + 1) * stripeHeight);
if (linesToSkip > 0) {
result = decoder->skipScanlines(linesToSkip);
switch (result) {
case SkCodec::kSuccess:
case SkCodec::kIncompleteInput:
break;
default:
return SkStringPrintf("Cannot skip scanlines for %s.", fPath.c_str());
}
}
}
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(SkScalarRoundToInt(preScaleW * fScale),
SkScalarRoundToInt(preScaleH * fScale));
size_t rowBytes = decodeInfo.minRowBytes();
if (!subsetBm.installPixels(decodeInfo, pixels, rowBytes, colorTable.get(),
NULL, NULL)) {
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(SkCodec::NewFromData(encoded));
if (NULL != codec) {
SkISize size = codec->getScaledDimensions(fScale);
return size;
} else {
return SkISize::Make(0, 0);
}
}
Name CodecSrc::name() const {
if (1.0f == fScale) {
return SkOSPath::Basename(fPath.c_str());
} else {
return SkStringPrintf("%s_%.3f", SkOSPath::Basename(fPath.c_str()).c_str(), fScale);
}
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
ImageSrc::ImageSrc(Path path, int divisor) : fPath(path), fDivisor(divisor) {}
Error ImageSrc::draw(SkCanvas* canvas) const {
SkImageInfo canvasInfo;
if (NULL == canvas->peekPixels(&canvasInfo, NULL)) {
// TODO: Instead, use lazy decoding to allow the GPU to handle cases like YUV.
return Error::Nonfatal("No need to test decoding to non-raster backend.");
}
SkAutoTUnref<SkData> encoded(SkData::NewFromFileName(fPath.c_str()));
if (!encoded) {
return SkStringPrintf("Couldn't read %s.", fPath.c_str());
}
const SkColorType dstColorType = canvasInfo.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*)NULL); // 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*)NULL); // 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 dfText,
bool threaded)
: fContextType(ct)
, fGpuAPI(api)
, fSampleCount(samples)
, fUseDFText(dfText)
, 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, fUseDFText));
if (!surface) {
return "Could not create a surface.";
}
if (FLAGS_preAbandonGpuContext) {
SkSetErrorCallback(&PreAbandonGpuContextErrorHandler, NULL);
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 NULL";
}
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 NULL";
}
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() {}
Error PDFSink::draw(const Src& src, SkBitmap*, SkWStream* dst, SkString*) const {
SkAutoTUnref<SkDocument> doc(SkDocument::CreatePDF(dst));
if (!doc) {
return "SkDocument::CreatePDF() returned NULL";
}
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 NULL";
}
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(SkNEW_ARGS(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; // We mirror SkDeferredCanvas, which doesn't use any flags.
return src.draw(pipe.startRecording(&controller, kFlags, size.width(), size.height()));
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
Error ViaDeferred::draw(const Src& src, SkBitmap* bitmap, SkWStream* stream, SkString* log) const {
// We draw via a deferred canvas into a surface that's compatible with the original canvas,
// then snap that surface as an image and draw it into the original canvas.
return draw_to_canvas(fSink, bitmap, stream, log, src.size(), [&](SkCanvas* canvas) -> Error {
SkAutoTUnref<SkSurface> surface(canvas->newSurface(canvas->imageInfo()));
if (!surface.get()) {
return "can't make surface for deferred canvas";
}
SkAutoTDelete<SkDeferredCanvas> defcan(SkDeferredCanvas::Create(surface));
Error err = src.draw(defcan);
if (!err.isEmpty()) {
return err;
}
SkAutoTUnref<SkImage> image(defcan->newImageSnapshot());
if (!image) {
return "failed to create deferred image snapshot";
}
canvas->drawImage(image, 0, 0, NULL);
return "";
});
}
/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*/
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;
SK_CREATE_MEMBER_DETECTOR(paint);
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);
}
// Most things that have paints are Draw-type ops. Create sub-pictures for each.
template <typename T>
SK_WHEN(HasMember_paint<T>, void) operator()(const T& op) {
SkPictureRecorder rec;
this->draw(op, rec.beginRecording(SkRect::MakeLargest()));
SkAutoTUnref<SkPicture> pic(rec.endRecordingAsPicture());
fCanvas->drawPicture(pic);
}
// If you don't have a paint or are a SaveLayer, you're not a Draw-type op.
// We cannot make subpictures out of these because they affect state. Draw them directly.
template <typename T>
SK_WHEN(!HasMember_paint<T>, void) operator()(const T& op) { this->draw(op, fCanvas); }
void operator()(const SkRecords::SaveLayer& 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 (unsigned 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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