skia2/gm/image_pict.cpp

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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 "gm.h"
#include "SkCanvas.h"
#include "SkImage.h"
#include "SkImageGenerator.h"
#include "SkImage_Base.h"
#include "SkMakeUnique.h"
#include "SkPictureRecorder.h"
#include "SkSurface.h"
#include "GrContext.h"
#include "GrContextPriv.h"
#include "GrSurfaceContext.h"
#include "GrTextureProxy.h"
#include "../src/image/SkImage_Gpu.h"
static void draw_something(SkCanvas* canvas, const SkRect& bounds) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(SK_ColorRED);
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(10);
canvas->drawRect(bounds, paint);
paint.setStyle(SkPaint::kFill_Style);
paint.setColor(SK_ColorBLUE);
canvas->drawOval(bounds, paint);
}
/*
* Exercise drawing pictures inside an image, showing that the image version is pixelated
* (correctly) when it is inside an image.
*/
class ImagePictGM : public skiagm::GM {
sk_sp<SkPicture> fPicture;
sk_sp<SkImage> fImage0;
sk_sp<SkImage> fImage1;
public:
ImagePictGM() {}
protected:
SkString onShortName() override {
return SkString("image-picture");
}
SkISize onISize() override {
return SkISize::Make(850, 450);
}
void onOnceBeforeDraw() override {
const SkRect bounds = SkRect::MakeXYWH(100, 100, 100, 100);
SkPictureRecorder recorder;
draw_something(recorder.beginRecording(bounds), bounds);
fPicture = recorder.finishRecordingAsPicture();
// extract enough just for the oval.
const SkISize size = SkISize::Make(100, 100);
auto srgbColorSpace = SkColorSpace::MakeSRGB();
SkMatrix matrix;
matrix.setTranslate(-100, -100);
fImage0 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr,
SkImage::BitDepth::kU8, srgbColorSpace);
matrix.postTranslate(-50, -50);
matrix.postRotate(45);
matrix.postTranslate(50, 50);
fImage1 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr,
SkImage::BitDepth::kU8, srgbColorSpace);
}
void drawSet(SkCanvas* canvas) const {
SkMatrix matrix = SkMatrix::MakeTrans(-100, -100);
canvas->drawPicture(fPicture, &matrix, nullptr);
canvas->drawImage(fImage0.get(), 150, 0);
canvas->drawImage(fImage1.get(), 300, 0);
}
void onDraw(SkCanvas* canvas) override {
canvas->translate(20, 20);
this->drawSet(canvas);
canvas->save();
canvas->translate(0, 130);
canvas->scale(0.25f, 0.25f);
this->drawSet(canvas);
canvas->restore();
canvas->save();
canvas->translate(0, 200);
canvas->scale(2, 2);
this->drawSet(canvas);
canvas->restore();
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM( return new ImagePictGM; )
///////////////////////////////////////////////////////////////////////////////////////////////////
static std::unique_ptr<SkImageGenerator> make_pic_generator(GrContext*, sk_sp<SkPicture> pic) {
SkMatrix matrix;
matrix.setTranslate(-100, -100);
return SkImageGenerator::MakeFromPicture({ 100, 100 }, std::move(pic), &matrix, nullptr,
SkImage::BitDepth::kU8,
SkColorSpace::MakeSRGB());
}
class RasterGenerator : public SkImageGenerator {
public:
RasterGenerator(const SkBitmap& bm) : SkImageGenerator(bm.info()), fBM(bm)
{}
protected:
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
const Options&) override {
SkASSERT(fBM.width() == info.width());
SkASSERT(fBM.height() == info.height());
return fBM.readPixels(info, pixels, rowBytes, 0, 0);
}
private:
SkBitmap fBM;
};
static std::unique_ptr<SkImageGenerator> make_ras_generator(GrContext*, sk_sp<SkPicture> pic) {
SkBitmap bm;
bm.allocN32Pixels(100, 100);
SkCanvas canvas(bm);
canvas.clear(0);
canvas.translate(-100, -100);
canvas.drawPicture(pic);
return skstd::make_unique<RasterGenerator>(bm);
}
class EmptyGenerator : public SkImageGenerator {
public:
EmptyGenerator(const SkImageInfo& info) : SkImageGenerator(info) {}
};
class TextureGenerator : public SkImageGenerator {
public:
TextureGenerator(GrContext* ctx, const SkImageInfo& info, sk_sp<SkPicture> pic)
: SkImageGenerator(info)
, fCtx(SkRef(ctx)) {
sk_sp<SkSurface> surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kYes, info, 0,
kTopLeft_GrSurfaceOrigin, nullptr));
if (surface) {
surface->getCanvas()->clear(0);
surface->getCanvas()->translate(-100, -100);
surface->getCanvas()->drawPicture(pic);
sk_sp<SkImage> image(surface->makeImageSnapshot());
fProxy = as_IB(image)->asTextureProxyRef();
}
}
protected:
sk_sp<GrTextureProxy> onGenerateTexture(GrContext* ctx, const SkImageInfo& info,
const SkIPoint& origin,
bool willBeMipped) override {
SkASSERT(ctx);
SkASSERT(ctx == fCtx.get());
if (!fProxy) {
return nullptr;
}
if (origin.fX == 0 && origin.fY == 0 &&
info.width() == fProxy->width() && info.height() == fProxy->height()) {
return fProxy;
}
// need to copy the subset into a new texture
GrSurfaceDesc desc;
desc.fWidth = info.width();
desc.fHeight = info.height();
desc.fConfig = fProxy->config();
GrMipMapped mipMapped = willBeMipped ? GrMipMapped::kYes : GrMipMapped::kNo;
sk_sp<GrSurfaceContext> dstContext(fCtx->contextPriv().makeDeferredSurfaceContext(
desc, fProxy->origin(), mipMapped, SkBackingFit::kExact, SkBudgeted::kYes));
if (!dstContext) {
return nullptr;
}
if (!dstContext->copy(
fProxy.get(),
SkIRect::MakeXYWH(origin.x(), origin.y(), info.width(), info.height()),
SkIPoint::Make(0, 0))) {
return nullptr;
}
return dstContext->asTextureProxyRef();
}
private:
sk_sp<GrContext> fCtx;
sk_sp<GrTextureProxy> fProxy;
};
static std::unique_ptr<SkImageGenerator> make_tex_generator(GrContext* ctx, sk_sp<SkPicture> pic) {
const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
if (!ctx) {
return skstd::make_unique<EmptyGenerator>(info);
}
return skstd::make_unique<TextureGenerator>(ctx, info, pic);
}
class ImageCacheratorGM : public skiagm::GM {
SkString fName;
std::unique_ptr<SkImageGenerator> (*fFactory)(GrContext*, sk_sp<SkPicture>);
sk_sp<SkPicture> fPicture;
sk_sp<SkImage> fImage;
sk_sp<SkImage> fImageSubset;
public:
ImageCacheratorGM(const char suffix[],
std::unique_ptr<SkImageGenerator> (*factory)(GrContext*, sk_sp<SkPicture>))
: fFactory(factory)
{
fName.printf("image-cacherator-from-%s", suffix);
}
protected:
SkString onShortName() override {
return fName;
}
SkISize onISize() override {
return SkISize::Make(960, 450);
}
void onOnceBeforeDraw() override {
const SkRect bounds = SkRect::MakeXYWH(100, 100, 100, 100);
SkPictureRecorder recorder;
draw_something(recorder.beginRecording(bounds), bounds);
fPicture = recorder.finishRecordingAsPicture();
}
void makeCaches(GrContext* ctx) {
auto gen = fFactory(ctx, fPicture);
fImage = SkImage::MakeFromGenerator(std::move(gen));
const SkIRect subset = SkIRect::MakeLTRB(50, 50, 100, 100);
gen = fFactory(ctx, fPicture);
fImageSubset = SkImage::MakeFromGenerator(std::move(gen), &subset);
SkASSERT(fImage->dimensions() == SkISize::Make(100, 100));
SkASSERT(fImageSubset->dimensions() == SkISize::Make(50, 50));
}
static void draw_as_bitmap(SkCanvas* canvas, SkImage* image, SkScalar x, SkScalar y) {
SkBitmap bitmap;
as_IB(image)->getROPixels(&bitmap);
canvas->drawBitmap(bitmap, x, y);
}
static void draw_as_tex(SkCanvas* canvas, SkImage* image, SkScalar x, SkScalar y) {
sk_sp<GrTextureProxy> proxy(as_IB(image)->asTextureProxyRef(
canvas->getGrContext(), GrSamplerState::ClampBilerp(), nullptr));
if (!proxy) {
// show placeholder if we have no texture
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
SkRect r = SkRect::MakeXYWH(x, y, SkIntToScalar(image->width()),
SkIntToScalar(image->width()));
canvas->drawRect(r, paint);
canvas->drawLine(r.left(), r.top(), r.right(), r.bottom(), paint);
canvas->drawLine(r.left(), r.bottom(), r.right(), r.top(), paint);
return;
}
// No API to draw a GrTexture directly, so we cheat and create a private image subclass
sk_sp<SkImage> texImage(new SkImage_Gpu(
sk_ref_sp(canvas->getGrContext()), image->uniqueID(), kPremul_SkAlphaType,
std::move(proxy), image->refColorSpace(), SkBudgeted::kNo));
canvas->drawImage(texImage.get(), x, y);
}
void drawSet(SkCanvas* canvas) const {
SkMatrix matrix = SkMatrix::MakeTrans(-100, -100);
canvas->drawPicture(fPicture, &matrix, nullptr);
// Draw the tex first, so it doesn't hit a lucky cache from the raster version. This
// way we also can force the generateTexture call.
draw_as_tex(canvas, fImage.get(), 310, 0);
draw_as_tex(canvas, fImageSubset.get(), 310+101, 0);
draw_as_bitmap(canvas, fImage.get(), 150, 0);
draw_as_bitmap(canvas, fImageSubset.get(), 150+101, 0);
}
void onDraw(SkCanvas* canvas) override {
this->makeCaches(canvas->getGrContext());
canvas->translate(20, 20);
this->drawSet(canvas);
canvas->save();
canvas->translate(0, 130);
canvas->scale(0.25f, 0.25f);
this->drawSet(canvas);
canvas->restore();
canvas->save();
canvas->translate(0, 200);
canvas->scale(2, 2);
this->drawSet(canvas);
canvas->restore();
}
private:
typedef skiagm::GM INHERITED;
};
DEF_GM( return new ImageCacheratorGM("picture", make_pic_generator); )
DEF_GM( return new ImageCacheratorGM("raster", make_ras_generator); )
DEF_GM( return new ImageCacheratorGM("texture", make_tex_generator); )