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 "SkImageCacherator.h"
#include "SkPictureRecorder.h"
#include "SkSurface.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#include "GrTexture.h"
#include "../src/image/SkImage_Gpu.h"
#endif
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);
SkMatrix matrix;
matrix.setTranslate(-100, -100);
fImage0 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr);
matrix.postTranslate(-50, -50);
matrix.postRotate(45);
matrix.postTranslate(50, 50);
fImage1 = SkImage::MakeFromPicture(fPicture, size, &matrix, nullptr);
}
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 SkImageGenerator* make_pic_generator(GrContext*, SkPicture* pic) {
SkMatrix matrix;
matrix.setTranslate(-100, -100);
return SkImageGenerator::NewFromPicture(SkISize::Make(100, 100), pic, &matrix, nullptr);
}
class RasterGenerator : public SkImageGenerator {
public:
RasterGenerator(const SkBitmap& bm) : SkImageGenerator(bm.info()), fBM(bm) {
fBM.lockPixels();
}
protected:
bool onGetPixels(const SkImageInfo& info, void* pixels, size_t rowBytes,
SkPMColor* ctable, int* ctableCount) override {
SkASSERT(fBM.width() == info.width());
SkASSERT(fBM.height() == info.height());
if (info.colorType() == kIndex_8_SkColorType) {
if (SkColorTable* ct = fBM.getColorTable()) {
if (ctable) {
memcpy(ctable, ct->readColors(), ct->count() * sizeof(SkPMColor));
}
if (ctableCount) {
*ctableCount = ct->count();
}
for (int y = 0; y < info.height(); ++y) {
memcpy(pixels, fBM.getAddr8(0, y), fBM.width());
pixels = (char*)pixels + rowBytes;
}
return true;
} else {
return false;
}
} else {
return fBM.readPixels(info, pixels, rowBytes, 0, 0);
}
}
private:
SkBitmap fBM;
};
static SkImageGenerator* make_ras_generator(GrContext*, SkPicture* pic) {
SkBitmap bm;
bm.allocN32Pixels(100, 100);
SkCanvas canvas(bm);
canvas.clear(0);
canvas.translate(-100, -100);
canvas.drawPicture(pic);
return new RasterGenerator(bm);
}
// so we can create a color-table
static int find_closest(SkPMColor c, const SkPMColor table[], int count) {
const int cr = SkGetPackedR32(c);
const int cg = SkGetPackedG32(c);
const int cb = SkGetPackedB32(c);
int minDist = 999999999;
int index = 0;
for (int i = 0; i < count; ++i) {
int dr = SkAbs32((int)SkGetPackedR32(table[i]) - cr);
int dg = SkAbs32((int)SkGetPackedG32(table[i]) - cg);
int db = SkAbs32((int)SkGetPackedB32(table[i]) - cb);
int dist = dr + dg + db;
if (dist < minDist) {
minDist = dist;
index = i;
}
}
return index;
}
static SkImageGenerator* make_ctable_generator(GrContext*, SkPicture* pic) {
SkBitmap bm;
bm.allocN32Pixels(100, 100);
SkCanvas canvas(bm);
canvas.clear(0);
canvas.translate(-100, -100);
canvas.drawPicture(pic);
const SkPMColor colors[] = {
SkPreMultiplyColor(SK_ColorRED),
SkPreMultiplyColor(0),
SkPreMultiplyColor(SK_ColorBLUE),
};
const int count = SK_ARRAY_COUNT(colors);
SkImageInfo info = SkImageInfo::Make(100, 100, kIndex_8_SkColorType, kPremul_SkAlphaType);
SkBitmap bm2;
SkAutoTUnref<SkColorTable> ct(new SkColorTable(colors, count));
bm2.allocPixels(info, nullptr, ct);
for (int y = 0; y < info.height(); ++y) {
for (int x = 0; x < info.width(); ++x) {
*bm2.getAddr8(x, y) = find_closest(*bm.getAddr32(x, y), colors, count);
}
}
return new RasterGenerator(bm2);
}
class EmptyGenerator : public SkImageGenerator {
public:
EmptyGenerator(const SkImageInfo& info) : SkImageGenerator(info) {}
};
#if SK_SUPPORT_GPU
class TextureGenerator : public SkImageGenerator {
public:
TextureGenerator(GrContext* ctx, const SkImageInfo& info, SkPicture* pic)
: SkImageGenerator(info)
, fCtx(SkRef(ctx))
{
auto surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info));
surface->getCanvas()->clear(0);
surface->getCanvas()->translate(-100, -100);
surface->getCanvas()->drawPicture(pic);
sk_sp<SkImage> image(surface->makeImageSnapshot());
fTexture.reset(SkRef(as_IB(image)->peekTexture()));
}
protected:
GrTexture* onGenerateTexture(GrContext* ctx, const SkIRect* subset) override {
if (ctx) {
SkASSERT(ctx == fCtx.get());
}
if (!subset) {
return SkRef(fTexture.get());
}
// need to copy the subset into a new texture
GrSurfaceDesc desc = fTexture->desc();
desc.fWidth = subset->width();
desc.fHeight = subset->height();
GrTexture* dst = fCtx->textureProvider()->createTexture(desc, SkBudgeted::kNo);
fCtx->copySurface(dst, fTexture, *subset, SkIPoint::Make(0, 0));
return dst;
}
private:
SkAutoTUnref<GrContext> fCtx;
SkAutoTUnref<GrTexture> fTexture;
};
static SkImageGenerator* make_tex_generator(GrContext* ctx, SkPicture* pic) {
const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
if (!ctx) {
return new EmptyGenerator(info);
}
return new TextureGenerator(ctx, info, pic);
}
#endif
class ImageCacheratorGM : public skiagm::GM {
SkString fName;
SkImageGenerator* (*fFactory)(GrContext*, SkPicture*);
sk_sp<SkPicture> fPicture;
SkAutoTDelete<SkImageCacherator> fCache;
SkAutoTDelete<SkImageCacherator> fCacheSubset;
public:
ImageCacheratorGM(const char suffix[], SkImageGenerator* (*factory)(GrContext*, 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.get());
SkDEBUGCODE(const uint32_t genID = gen->uniqueID();)
fCache.reset(SkImageCacherator::NewFromGenerator(gen));
const SkIRect subset = SkIRect::MakeLTRB(50, 50, 100, 100);
gen = fFactory(ctx, fPicture.get());
SkDEBUGCODE(const uint32_t genSubsetID = gen->uniqueID();)
fCacheSubset.reset(SkImageCacherator::NewFromGenerator(gen, &subset));
// whole caches should have the same ID as the generator. Subsets should be diff
SkASSERT(fCache->uniqueID() == genID);
SkASSERT(fCacheSubset->uniqueID() != genID);
SkASSERT(fCacheSubset->uniqueID() != genSubsetID);
SkASSERT(fCache->info().dimensions() == SkISize::Make(100, 100));
SkASSERT(fCacheSubset->info().dimensions() == SkISize::Make(50, 50));
}
static void draw_as_bitmap(SkCanvas* canvas, SkImageCacherator* cache, SkScalar x, SkScalar y) {
SkBitmap bitmap;
cache->lockAsBitmap(&bitmap, nullptr);
canvas->drawBitmap(bitmap, x, y);
}
static void draw_as_tex(SkCanvas* canvas, SkImageCacherator* cache, SkScalar x, SkScalar y) {
#if SK_SUPPORT_GPU
SkAutoTUnref<GrTexture> texture(cache->lockAsTexture(canvas->getGrContext(),
GrTextureParams::ClampBilerp(),
nullptr));
if (!texture) {
// show placeholder if we have no texture
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
SkRect r = SkRect::MakeXYWH(x, y, SkIntToScalar(cache->info().width()),
SkIntToScalar(cache->info().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
SkAutoTUnref<SkImage> image(new SkImage_Gpu(cache->info().width(), cache->info().height(),
cache->uniqueID(), kPremul_SkAlphaType, texture,
SkBudgeted::kNo));
canvas->drawImage(image, x, y);
#endif
}
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, fCache, 310, 0);
draw_as_tex(canvas, fCacheSubset, 310+101, 0);
draw_as_bitmap(canvas, fCache, 150, 0);
draw_as_bitmap(canvas, fCacheSubset, 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("ctable", make_ctable_generator); )
#if SK_SUPPORT_GPU
DEF_GM( return new ImageCacheratorGM("texture", make_tex_generator); )
#endif