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a1193e4b0e
skia2/gm/dcshader.cpp
scroggo a1193e4b0e Make SkStream *not* ref counted. 
SkStream is a stateful object, so it does not make sense for it to have
multiple owners. Make SkStream inherit directly from SkNoncopyable.

Update methods which previously called SkStream::ref() (e.g.
SkImageDecoder::buildTileIndex() and SkFrontBufferedStream::Create(),
which required the existing owners to call SkStream::unref()) to take
ownership of their SkStream parameters and delete when done (including
on failure).

Switch all SkAutoTUnref<SkStream>s to SkAutoTDelete<SkStream>s. In some
cases this means heap allocating streams that were previously stack
allocated.

Respect ownership rules of SkTypeface::CreateFromStream() and
SkImageDecoder::buildTileIndex().

Update the comments for exceptional methods which do not affect the
ownership of their SkStream parameters (e.g.
SkPicture::CreateFromStream() and SkTypeface::Deserialize()) to be
explicit about ownership.

Remove test_stream_life, which tested that buildTileIndex() behaved
correctly when SkStream was a ref counted object. The test does not
make sense now that it is not.

In SkPDFStream, remove the SkMemoryStream member. Instead of using it,
create a new SkMemoryStream to pass to fDataStream (which is now an
SkAutoTDelete).

Make other pdf rasterizers behave like SkPDFDocumentToBitmap.

SkPDFDocumentToBitmap delete the SkStream, so do the same in the
following pdf rasterizers:

SkPopplerRasterizePDF
SkNativeRasterizePDF
SkNoRasterizePDF

Requires a change to Android, which currently treats SkStreams as ref
counted objects.

Review URL: https://codereview.chromium.org/849103004
2015-01-21 12:09:53 -08:00

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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#if SK_SUPPORT_GPU
#include "GrFragmentProcessor.h"
#include "GrCoordTransform.h"
#include "gl/GrGLProcessor.h"
#include "gl/builders/GrGLProgramBuilder.h"
#include "Resources.h"
#include "SkReadBuffer.h"
#include "SkShader.h"
#include "SkStream.h"
#include "SkTypeface.h"
#include "SkWriteBuffer.h"
namespace skiagm {
///////////////////////////////////////////////////////////////////////////////
class DCShader : public SkShader {
public:
DCShader(const SkMatrix& matrix) : fDeviceMatrix(matrix) {}
SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(DCShader);
void flatten(SkWriteBuffer& buf) const SK_OVERRIDE {
buf.writeMatrix(fDeviceMatrix);
}
bool asFragmentProcessor(GrContext*, const SkPaint& paint, const SkMatrix& viewM,
const SkMatrix* localMatrix, GrColor* color,
GrFragmentProcessor** fp) const SK_OVERRIDE;
private:
const SkMatrix fDeviceMatrix;
};
SkFlattenable* DCShader::CreateProc(SkReadBuffer& buf) {
SkMatrix matrix;
buf.readMatrix(&matrix);
return SkNEW_ARGS(DCShader, (matrix));
}
class DCFP : public GrFragmentProcessor {
public:
DCFP(const SkMatrix& m) : fDeviceTransform(kDevice_GrCoordSet, m) {
this->addCoordTransform(&fDeviceTransform);
this->initClassID<DCFP>();
}
void getGLProcessorKey(const GrGLCaps& caps,
GrProcessorKeyBuilder* b) const SK_OVERRIDE {}
GrGLFragmentProcessor* createGLInstance() const SK_OVERRIDE {
class DCGLFP : public GrGLFragmentProcessor {
void emitCode(GrGLFPBuilder* builder,
const GrFragmentProcessor& fp,
const char* outputColor,
const char* inputColor,
const TransformedCoordsArray& coords,
const TextureSamplerArray& samplers) {
GrGLFPFragmentBuilder* fpb = builder->getFragmentShaderBuilder();
fpb->codeAppendf("vec2 c = %s;", fpb->ensureFSCoords2D(coords, 0).c_str());
fpb->codeAppend("vec2 r = mod(c, vec2(20.0));");
fpb->codeAppend("vec4 color = vec4(0.5*sin(c.x / 15.0) + 0.5,"
"0.5*cos((c.x + c.y) / 15.0) + 0.5,"
"(r.x + r.y) / 20.0,"
"distance(r, vec2(15.0)) / 20.0 + 0.2);");
fpb->codeAppendf("color.rgb *= color.a;"
"%s = color * %s;",
outputColor, GrGLSLExpr4(inputColor).c_str());
}
void setData(const GrGLProgramDataManager&, const GrProcessor&) SK_OVERRIDE {}
};
return SkNEW(DCGLFP);
}
const char* name() const SK_OVERRIDE { return "DCFP"; }
void onComputeInvariantOutput(GrInvariantOutput* inout) const SK_OVERRIDE {
inout->mulByUnknownFourComponents();
}
private:
bool onIsEqual(const GrFragmentProcessor&) const SK_OVERRIDE { return true; }
GrCoordTransform fDeviceTransform;
};
bool DCShader::asFragmentProcessor(GrContext*, const SkPaint& paint, const SkMatrix& viewM,
const SkMatrix* localMatrix, GrColor* color,
GrFragmentProcessor** fp) const {
*fp = SkNEW_ARGS(DCFP, (fDeviceMatrix));
*color = GrColorPackA4(paint.getAlpha());
return true;
}
class DCShaderGM : public GM {
public:
DCShaderGM() {
this->setBGColor(0xFFAABBCC);
}
~DCShaderGM() SK_OVERRIDE {
for (int i = 0; i < fPrims.count(); ++i) {
SkDELETE(fPrims[i]);
}
}
protected:
uint32_t onGetFlags() const SK_OVERRIDE {
return kGPUOnly_Flag;
}
SkString onShortName() SK_OVERRIDE {
return SkString("dcshader");
}
SkISize onISize() SK_OVERRIDE { return SkISize::Make(1000, 900); }
void onOnceBeforeDraw() SK_OVERRIDE {
struct Rect : public Prim {
SkRect draw(SkCanvas* canvas, const SkPaint& paint) SK_OVERRIDE {
SkRect rect = SkRect::MakeXYWH(0, 0, 50, 50);
canvas->drawRect(rect, paint);
return rect;
}
};
struct Circle : public Prim {
SkRect draw(SkCanvas* canvas, const SkPaint& paint) SK_OVERRIDE {
static const SkScalar radius = 25;
canvas->drawCircle(radius, radius, radius, paint);
return SkRect::MakeXYWH(0, 0, 2 * radius, 2 * radius);
}
};
struct RRect : public Prim {
SkRect draw(SkCanvas* canvas, const SkPaint& paint) SK_OVERRIDE {
SkRRect rrect;
rrect.setRectXY(SkRect::MakeXYWH(0, 0, 50, 50), 10, 10);
canvas->drawRRect(rrect, paint);
return rrect.getBounds();
}
};
struct DRRect : public Prim {
SkRect draw(SkCanvas* canvas, const SkPaint& paint) SK_OVERRIDE {
SkRRect outerRRect;
outerRRect.setRectXY(SkRect::MakeXYWH(0, 0, 50, 50), 5, 5);
SkRRect innerRRect;
innerRRect.setRectXY(SkRect::MakeXYWH(5, 8, 35, 30), 8, 3);
canvas->drawDRRect(outerRRect, innerRRect, paint);
return outerRRect.getBounds();
}
};
struct Path : public Prim {
SkRect draw(SkCanvas* canvas, const SkPaint& paint) SK_OVERRIDE {
SkPath path;
path.addCircle(15, 15, 10);
path.addOval(SkRect::MakeXYWH(2, 2, 22, 37));
path.setFillType(SkPath::kEvenOdd_FillType);
canvas->drawPath(path, paint);
return path.getBounds();
}
};
struct Points : public Prim {
Points(SkCanvas::PointMode mode) : fMode(mode) {}
SkRect draw(SkCanvas* canvas, const SkPaint& paint) SK_OVERRIDE {
SkRandom random;
SkPoint points[500];
SkRect bounds = SkRect::MakeWH(50, 50);
int count = SkToInt(SK_ARRAY_COUNT(points));
if (SkCanvas::kPoints_PointMode != fMode) {
count = SkTMin(count, 10);
}
for (int p = 0; p < count; ++p) {
points[p].fX = random.nextUScalar1() * bounds.width();
points[p].fY = random.nextUScalar1() * bounds.width();
}
canvas->drawPoints(fMode, count, points, paint);
return bounds;
}
SkCanvas::PointMode fMode;
};
struct Text : public Prim {
SkRect draw(SkCanvas* canvas, const SkPaint& origPaint) SK_OVERRIDE {
SkPaint paint = origPaint;
paint.setTextSize(30.f);
this->setFont(&paint);
const char* text = this->text();
static const SkVector offset = SkVector::Make(10, 10);
canvas->drawText(text, strlen(text), offset.fX, offset.fY, paint);
SkRect bounds;
paint.measureText(text, strlen(text), &bounds);
bounds.offset(offset);
return bounds;
}
virtual void setFont(SkPaint* paint) {
sk_tool_utils::set_portable_typeface(paint);
}
virtual const char* text() const { return "Hello, Skia!"; }
};
struct BmpText : public Text {
void setFont(SkPaint* paint) SK_OVERRIDE {
if (!fTypeface) {
SkString filename = GetResourcePath("/Funkster.ttf");
SkAutoTDelete<SkFILEStream> stream(new SkFILEStream(filename.c_str()));
if (!stream->isValid()) {
SkDebugf("Could not find Funkster.ttf, please set --resourcePath "
"correctly.\n");
return;
}
fTypeface.reset(SkTypeface::CreateFromStream(stream.detach()));
}
paint->setTypeface(fTypeface);
}
const char* text() const SK_OVERRIDE { return "Hi, Skia!"; }
SkAutoTUnref<SkTypeface> fTypeface;
};
fPrims.push_back(SkNEW(Rect));
fPrims.push_back(SkNEW(Circle));
fPrims.push_back(SkNEW(RRect));
fPrims.push_back(SkNEW(DRRect));
fPrims.push_back(SkNEW(Path));
fPrims.push_back(SkNEW(Points(SkCanvas::kPoints_PointMode)));
fPrims.push_back(SkNEW(Points(SkCanvas::kLines_PointMode)));
fPrims.push_back(SkNEW(Points(SkCanvas::kPolygon_PointMode)));
fPrims.push_back(SkNEW(Text));
fPrims.push_back(SkNEW(BmpText));
}
void onDraw(SkCanvas* canvas) SK_OVERRIDE {
SkPaint paint;
SkTArray<SkMatrix> devMats;
devMats.push_back().reset();
devMats.push_back().setRotate(45, 500, 500);
devMats.push_back().setRotate(-30, 200, 200);
devMats.back().setPerspX(-SK_Scalar1 / 2000);
devMats.back().setPerspY(SK_Scalar1 / 1000);
SkTArray<SkMatrix> viewMats;
viewMats.push_back().setScale(0.75f, 0.75f);
viewMats.push_back().setRotate(45, 50, 50);
viewMats.back().postScale(0.5f, 1.1f);
canvas->translate(10, 20);
canvas->save();
SkScalar tx = 0, maxTy = 0;
static const SkScalar kW = 900;
for (int aa = 0; aa < 2; ++aa) {
for (int i = 0; i < fPrims.count(); ++i) {
for (int j = 0; j < devMats.count(); ++j) {
for (int k = 0; k < viewMats.count(); ++k) {
paint.setShader(SkNEW_ARGS(DCShader, (devMats[j])))->unref();
paint.setAntiAlias(SkToBool(aa));
canvas->save();
canvas->concat(viewMats[k]);
SkRect bounds = fPrims[i]->draw(canvas, paint);
canvas->restore();
viewMats[k].mapRect(&bounds);
// add margins
bounds.fRight += 20;
bounds.fBottom += 20;
canvas->translate(bounds.fRight, 0);
tx += bounds.fRight;
maxTy = SkTMax(bounds.fBottom, maxTy);
if (tx > kW) {
tx = 0;
canvas->restore();
canvas->translate(0, maxTy);
canvas->save();
maxTy = 0;
}
}
}
}
}
canvas->restore();
}
private:
struct Prim {
virtual ~Prim() {}
virtual SkRect draw(SkCanvas*, const SkPaint&) = 0;
};
SkTArray<Prim*> fPrims;
typedef GM INHERITED;
};
DEF_GM( return SkNEW(DCShaderGM); )
}
#endif
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