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SkPictureImageGenerator

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R=reed@google.com

Review URL: https://codereview.chromium.org/1240093004
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fmalita 2015-08-04 13:53:14 -07:00 committed by Commit bot
parent 8caa5af92c
commit 1dedc3d2c0
4 changed files with 278 additions and 0 deletions
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186
gm/pictureimagegenerator.cpp Normal file
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@ -0,0 +1,186 @@
/*
* 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 "gm.h"
#include "SkBitmap.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkImageGenerator.h"
#include "SkPaint.h"
#include "SkPathOps.h"
#include "SkPicture.h"
#include "SkPictureRecorder.h"
static void draw_vector_logo(SkCanvas* canvas, const SkRect& viewBox) {
static const char kSkiaStr[] = "SKIA";
static const SkScalar kGradientPad = .1f;
static const SkScalar kVerticalSpacing = 0.25f;
static const SkScalar kAccentScale = 1.20f;
SkPaint paint;
paint.setAntiAlias(true);
paint.setSubpixelText(true);
paint.setFakeBoldText(true);
sk_tool_utils::set_portable_typeface(&paint);
SkPath path;
SkRect iBox, skiBox, skiaBox;
paint.getTextPath("SKI", 3, 0, 0, &path);
TightBounds(path, &skiBox);
paint.getTextPath("I", 1, 0, 0, &path);
TightBounds(path, &iBox);
iBox.offsetTo(skiBox.fRight - iBox.width(), iBox.fTop);
const size_t textLen = strlen(kSkiaStr);
paint.getTextPath(kSkiaStr, textLen, 0, 0, &path);
TightBounds(path, &skiaBox);
skiaBox.outset(0, 2 * iBox.width() * (kVerticalSpacing + 1));
const SkScalar accentSize = iBox.width() * kAccentScale;
const SkScalar underlineY = iBox.bottom() +
(kVerticalSpacing + SkScalarSqrt(3) / 2) * accentSize;
SkMatrix m;
m.setRectToRect(skiaBox, viewBox, SkMatrix::kFill_ScaleToFit);
SkAutoCanvasRestore acr(canvas, true);
canvas->concat(m);
canvas->drawCircle(iBox.centerX(),
iBox.y() - (0.5f + kVerticalSpacing) * accentSize,
accentSize / 2,
paint);
path.reset();
path.moveTo(iBox.centerX() - accentSize / 2, iBox.bottom() + kVerticalSpacing * accentSize);
path.rLineTo(accentSize, 0);
path.lineTo(iBox.centerX(), underlineY);
canvas->drawPath(path, paint);
SkRect underlineRect = SkRect::MakeLTRB(iBox.centerX() - iBox.width() * accentSize * 3,
underlineY,
iBox.centerX(),
underlineY + accentSize / 10);
const SkPoint pts1[] = { SkPoint::Make(underlineRect.x(), 0),
SkPoint::Make(iBox.centerX(), 0) };
const SkScalar pos1[] = { 0, 0.75f };
const SkColor colors1[] = { SK_ColorTRANSPARENT, SK_ColorBLACK };
SkASSERT(SK_ARRAY_COUNT(pos1) == SK_ARRAY_COUNT(colors1));
SkAutoTUnref<SkShader> gradient1(SkGradientShader::CreateLinear(pts1, colors1, pos1,
SK_ARRAY_COUNT(pos1),
SkShader::kClamp_TileMode));
paint.setShader(gradient1.get());
canvas->drawRect(underlineRect, paint);
const SkPoint pts2[] = { SkPoint::Make(iBox.x() - iBox.width() * kGradientPad, 0),
SkPoint::Make(iBox.right() + iBox.width() * kGradientPad, 0) };
const SkScalar pos2[] = { 0, .01f, 1.0f/3, 1.0f/3, 2.0f/3, 2.0f/3, .99f, 1 };
const SkColor colors2[] = {
SK_ColorBLACK,
0xffca5139,
0xffca5139,
0xff8dbd53,
0xff8dbd53,
0xff5460a5,
0xff5460a5,
SK_ColorBLACK
};
SkASSERT(SK_ARRAY_COUNT(pos2) == SK_ARRAY_COUNT(colors2));
SkAutoTUnref<SkShader> gradient2(SkGradientShader::CreateLinear(pts2, colors2, pos2,
SK_ARRAY_COUNT(pos2),
SkShader::kClamp_TileMode));
paint.setShader(gradient2.get());
canvas->drawText(kSkiaStr, textLen, 0, 0, paint);
}
// This GM exercises SkPictureImageGenerator features
// (in particular its matrix vs. bounds semantics).
class PictureGeneratorGM : public skiagm::GM {
protected:
SkString onShortName() override {
return SkString("pictureimagegenerator");
}
SkISize onISize() override {
return SkISize::Make(1160, 860);
}
void onOnceBeforeDraw() override {
const SkRect rect = SkRect::MakeWH(kPictureWidth, kPictureHeight);
SkPictureRecorder recorder;
SkCanvas* canvas = recorder.beginRecording(rect);
draw_vector_logo(canvas, rect);
fPicture.reset(recorder.endRecording());
}
void onDraw(SkCanvas* canvas) override {
const struct {
SkISize size;
SkScalar scaleX, scaleY;
SkScalar opacity;
} configs[] = {
{ SkISize::Make(200, 100), 1, 1, 1 },
{ SkISize::Make(200, 200), 1, 1, 1 },
{ SkISize::Make(200, 200), 1, 2, 1 },
{ SkISize::Make(400, 200), 2, 2, 1 },
{ SkISize::Make(200, 100), 1, 1, 0.9f },
{ SkISize::Make(200, 200), 1, 1, 0.75f },
{ SkISize::Make(200, 200), 1, 2, 0.5f },
{ SkISize::Make(400, 200), 2, 2, 0.25f },
{ SkISize::Make(200, 200), 0.5f, 1, 1 },
{ SkISize::Make(200, 200), 1, 0.5f, 1 },
{ SkISize::Make(200, 200), 0.5f, 0.5f, 1 },
{ SkISize::Make(200, 200), 2, 2, 1 },
{ SkISize::Make(200, 100), -1, 1, 1 },
{ SkISize::Make(200, 100), 1, -1, 1 },
{ SkISize::Make(200, 100), -1, -1, 1 },
{ SkISize::Make(200, 100), -1, -1, 0.5f },
};
const unsigned kDrawsPerRow = 4;
const SkScalar kDrawSize = 250;
for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) {
SkPaint p;
p.setAlpha(SkScalarRoundToInt(255 * configs[i].opacity));
SkMatrix m = SkMatrix::MakeScale(configs[i].scaleX, configs[i].scaleY);
if (configs[i].scaleX < 0) {
m.postTranslate(SkIntToScalar(configs[i].size.width()), 0);
}
if (configs[i].scaleY < 0) {
m.postTranslate(0, SkIntToScalar(configs[i].size.height()));
}
SkAutoTDelete<SkImageGenerator> gen(
SkImageGenerator::NewFromPicture(configs[i].size, fPicture.get(), &m,
p.getAlpha() != 255 ? &p : nullptr));
SkBitmap bm;
SkAssertResult(SkInstallDiscardablePixelRef(gen.detach(), &bm));
const SkScalar x = kDrawSize * (i % kDrawsPerRow);
const SkScalar y = kDrawSize * (i / kDrawsPerRow);
p.setColor(0xfff0f0f0);
p.setAlpha(255);
canvas->drawRect(SkRect::MakeXYWH(x, y,
SkIntToScalar(bm.width()),
SkIntToScalar(bm.height())), p);
canvas->drawBitmap(bm, x, y);
}
}
private:
SkAutoTUnref<SkPicture> fPicture;
const SkScalar kPictureWidth = 200;
const SkScalar kPictureHeight = 100;
typedef skiagm::GM INHERITED;
};
DEF_GM( return SkNEW(PictureGeneratorGM); )

1
gyp/core.gypi
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@ -150,6 +150,7 @@
'<(skia_src_path)/core/SkPictureData.h', '<(skia_src_path)/core/SkPictureData.h',
'<(skia_src_path)/core/SkPictureFlat.cpp', '<(skia_src_path)/core/SkPictureFlat.cpp',
'<(skia_src_path)/core/SkPictureFlat.h', '<(skia_src_path)/core/SkPictureFlat.h',
'<(skia_src_path)/core/SkPictureImageGenerator.cpp',
'<(skia_src_path)/core/SkPicturePlayback.cpp', '<(skia_src_path)/core/SkPicturePlayback.cpp',
'<(skia_src_path)/core/SkPicturePlayback.h', '<(skia_src_path)/core/SkPicturePlayback.h',
'<(skia_src_path)/core/SkPictureRecord.cpp', '<(skia_src_path)/core/SkPictureRecord.cpp',

11
include/core/SkImageGenerator.h
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@ -14,6 +14,9 @@
class SkBitmap; class SkBitmap;
class SkData; class SkData;
class SkImageGenerator; class SkImageGenerator;
class SkMatrix;
class SkPaint;
class SkPicture;
/** /**
* Takes ownership of SkImageGenerator. If this method fails for * Takes ownership of SkImageGenerator. If this method fails for
@ -126,6 +129,14 @@ public:
*/ */
static SkImageGenerator* NewFromEncoded(SkData*); static SkImageGenerator* NewFromEncoded(SkData*);
/** Return a new image generator backed by the specified picture. If the size is empty or
* the picture is NULL, this returns NULL.
* The optional matrix and paint arguments are passed to drawPicture() at rasterization
* time.
*/
static SkImageGenerator* NewFromPicture(const SkISize&, const SkPicture*, const SkMatrix*,
const SkPaint*);
protected: protected:
SkImageGenerator(const SkImageInfo& info) : fInfo(info) {} SkImageGenerator(const SkImageInfo& info) : fInfo(info) {}

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src/core/SkPictureImageGenerator.cpp Normal file
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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 "SkImageGenerator.h"
#include "SkCanvas.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPicture.h"
class SkPictureImageGenerator : SkImageGenerator {
public:
static SkImageGenerator* Create(const SkISize&, const SkPicture*, const SkMatrix*,
const SkPaint*);
protected:
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes, SkPMColor ctable[],
int* ctableCount) override;
private:
SkPictureImageGenerator(const SkISize&, const SkPicture*, const SkMatrix*, const SkPaint*);
SkAutoTUnref<const SkPicture> fPicture;
SkMatrix fMatrix;
SkTLazy<SkPaint> fPaint;
typedef SkImageGenerator INHERITED;
};
SkImageGenerator* SkPictureImageGenerator::Create(const SkISize& size, const SkPicture* picture,
const SkMatrix* matrix, const SkPaint* paint) {
if (!picture || size.isEmpty()) {
return nullptr;
}
return SkNEW_ARGS(SkPictureImageGenerator, (size, picture, matrix, paint));
}
SkPictureImageGenerator::SkPictureImageGenerator(const SkISize& size, const SkPicture* picture,
const SkMatrix* matrix, const SkPaint* paint)
: INHERITED(SkImageInfo::MakeN32Premul(size))
, fPicture(SkRef(picture)) {
if (matrix) {
fMatrix = *matrix;
} else {
fMatrix.reset();
}
if (paint) {
fPaint.set(*paint);
}
}
bool SkPictureImageGenerator::onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor ctable[], int* ctableCount) {
if (info != getInfo() || ctable || ctableCount) {
return false;
}
SkBitmap bitmap;
if (!bitmap.installPixels(info, pixels, rowBytes)) {
return false;
}
bitmap.eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(bitmap, SkSurfaceProps(0, kUnknown_SkPixelGeometry));
canvas.drawPicture(fPicture, &fMatrix, fPaint.getMaybeNull());
return true;
}
SkImageGenerator* SkImageGenerator::NewFromPicture(const SkISize& size, const SkPicture* picture,
const SkMatrix* matrix, const SkPaint* paint) {
return SkPictureImageGenerator::Create(size, picture, matrix, paint);
}