image.cpp File Reference

#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorPriv.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkData.h"
#include "include/core/SkFont.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPicture.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkPixmap.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSerialProcs.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/encode/SkJpegEncoder.h"
#include "include/encode/SkPngEncoder.h"
#include "include/gpu/GrDirectContext.h"
#include "include/gpu/ganesh/SkImageGanesh.h"
#include "include/gpu/ganesh/SkSurfaceGanesh.h"
#include "include/private/base/SkMalloc.h"
#include "src/core/SkAutoPixmapStorage.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkWriteBuffer.h"
#include "src/image/SkImage_Base.h"
#include "tools/GpuToolUtils.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
#include <functional>
#include <utility>

Go to the source code of this file.

Classes
class	ImageGM
class	ScalePixelsGM

Typedefs
typedef sk_sp< SkImage >(*	ImageMakerProc) (const SkImageInfo &, GrRecordingContext *, void(*) (SkCanvas *))

Functions
static void	draw_contents (SkSurface *surface, SkColor fillC)
static void	test_surface (SkCanvas *canvas, SkSurface *surf, bool usePaint)
static void	draw_pixmap (SkCanvas *canvas, const SkPixmap &pmap)
static void	show_scaled_pixels (SkCanvas *canvas, SkImage *image)
static void	draw_contents (SkCanvas *canvas)
static sk_sp< SkImage >	make_raster (const SkImageInfo &info, GrRecordingContext *, void(*draw)(SkCanvas *))
static sk_sp< SkImage >	make_picture (const SkImageInfo &info, GrRecordingContext *, void(*draw)(SkCanvas *))
static sk_sp< SkImage >	make_codec (const SkImageInfo &info, GrRecordingContext *, void(*draw)(SkCanvas *))
static sk_sp< SkImage >	make_gpu (const SkImageInfo &info, GrRecordingContext *ctx, void(*draw)(SkCanvas *))
	DEF_SIMPLE_GM_CAN_FAIL (new_texture_image, canvas, errorMsg, 280, 115)
static void	draw_pixmap (SkCanvas *canvas, const SkPixmap &pm, SkScalar x, SkScalar y)
static void	slam_ff (const SkPixmap &pm)
	DEF_SIMPLE_GM (scalepixels_unpremul, canvas, 1080, 280)
static sk_sp< SkImage >	make_lazy_image ()
static sk_sp< SkImage >	serial_deserial (SkImage *img)
	DEF_SIMPLE_GM_CAN_FAIL (image_subset, canvas, errorMsg, 440, 220)

Variables
const SkSamplingOptions	gSamplings []

Typedef Documentation

ImageMakerProc

typedef sk_sp< SkImage >(* ImageMakerProc) (const SkImageInfo &, GrRecordingContext *, void(*)(SkCanvas *))

Definition at line 284 of file image.cpp.

Function Documentation

DEF_SIMPLE_GM()

DEF_SIMPLE_GM	(	scalepixels_unpremul	,
		canvas	,
		1080	,
		280
	)

Definition at line 443 of file image.cpp.

                                                       {
    SkImageInfo info = SkImageInfo::MakeN32(16, 16, kUnpremul_SkAlphaType);
    SkAutoPixmapStorage pm;
    pm.alloc(info);
    for (int y = 0; y < 16; ++y) {
        for (int x = 0; x < 16; ++x) {
            *pm.writable_addr32(x, y) = SkPackARGB32NoCheck(0, (y << 4) | y, (x << 4) | x, 0xFF);
        }
    }
    SkAutoPixmapStorage pm2;
    pm2.alloc(SkImageInfo::MakeN32(256, 256, kUnpremul_SkAlphaType));
 
    for (auto s : gSamplings) {
        pm.scalePixels(pm2, s);
        slam_ff(pm2);
        draw_pixmap(canvas, pm2, 10, 10);
        canvas->translate(pm2.width() + 10.0f, 0);
    }
}

DEF_SIMPLE_GM_CAN_FAIL() [1/2]

DEF_SIMPLE_GM_CAN_FAIL	(	image_subset	,
		canvas	,
		errorMsg	,
		440	,
		220
	)

Definition at line 502 of file image.cpp.

                                                                 {
    auto img = make_lazy_image();
    if (!img) {
        *errorMsg = "Failed to make lazy image.";
        return skiagm::DrawResult::kFail;
    }
 
    GrDirectContext* dContext = GrAsDirectContext(canvas->recordingContext());
#if defined(SK_GRAPHITE)
    auto recorder = canvas->recorder();
#endif
 
    canvas->drawImage(img, 10, 10);
 
    sk_sp<SkImage> subset;
 
#if defined(SK_GRAPHITE)
    if (recorder) {
        subset = img->makeSubset(recorder, {100, 100, 200, 200}, {});
    } else
#endif
    {
        subset = img->makeSubset(dContext, {100, 100, 200, 200});
    }
 
    canvas->drawImage(subset, 220, 10);
    subset = serial_deserial(subset.get());
    canvas->drawImage(subset, 220+110, 10);
    return skiagm::DrawResult::kOk;
}

DEF_SIMPLE_GM_CAN_FAIL() [2/2]

DEF_SIMPLE_GM_CAN_FAIL	(	new_texture_image	,
		canvas	,
		errorMsg	,
		280	,
		115
	)

Definition at line 319 of file image.cpp.

                                                                      {
 
    GrDirectContext* dContext = GrAsDirectContext(canvas->recordingContext());
    bool isGPU = SkToBool(dContext);
 
#if defined(SK_GRAPHITE)
    skgpu::graphite::Recorder* recorder = canvas->recorder();
    isGPU = isGPU || SkToBool(recorder);
#endif
 
    if (!isGPU) {
        *errorMsg = skiagm::GM::kErrorMsg_DrawSkippedGpuOnly;
        return skiagm::DrawResult::kSkip;
    }
 
    auto render_image = [](SkCanvas* canvas) {
        canvas->clear(SK_ColorBLUE);
        SkPaint paint;
        paint.setColor(SK_ColorRED);
        canvas->drawRect(SkRect::MakeXYWH(10.f,10.f,10.f,10.f), paint);
        paint.setColor(SK_ColorGREEN);
        canvas->drawRect(SkRect::MakeXYWH(30.f,10.f,10.f,10.f), paint);
        paint.setColor(SK_ColorYELLOW);
        canvas->drawRect(SkRect::MakeXYWH(10.f,30.f,10.f,10.f), paint);
        paint.setColor(SK_ColorCYAN);
        canvas->drawRect(SkRect::MakeXYWH(30.f,30.f,10.f,10.f), paint);
    };
 
    static constexpr int kSize = 50;
    SkImageInfo ii = SkImageInfo::Make(kSize, kSize,
                                       kRGBA_8888_SkColorType, kPremul_SkAlphaType,
                                       SkColorSpace::MakeSRGB());
    SkBitmap bmp;
    bmp.allocPixels(ii);
    SkCanvas bmpCanvas(bmp);
    render_image(&bmpCanvas);
 
    std::function<sk_sp<SkImage>()> imageFactories[] = {
            // Create sw raster image.
            [&] { return bmp.asImage(); },
            // Create encoded image.
            [&] {
                SkDynamicMemoryWStream stream;
                SkASSERT_RELEASE(SkPngEncoder::Encode(&stream, bmp.pixmap(), {}));
                return SkImages::DeferredFromEncodedData(stream.detachAsData());
            },
            // Create YUV encoded image.
            [&] {
                SkDynamicMemoryWStream stream;
                SkASSERT_RELEASE(SkJpegEncoder::Encode(&stream, bmp.pixmap(), {}));
                return SkImages::DeferredFromEncodedData(stream.detachAsData());
            },
            // Create a picture image.
            [&] {
                SkPictureRecorder recorder;
                SkCanvas* canvas =
                        recorder.beginRecording(SkIntToScalar(kSize), SkIntToScalar(kSize));
                render_image(canvas);
                sk_sp<SkColorSpace> srgbColorSpace = SkColorSpace::MakeSRGB();
                return SkImages::DeferredFromPicture(recorder.finishRecordingAsPicture(),
                                                     SkISize::Make(kSize, kSize),
                                                     nullptr,
                                                     nullptr,
                                                     SkImages::BitDepth::kU8,
                                                     srgbColorSpace);
            },
            // Create a texture image
            [&]() -> sk_sp<SkImage> {
                sk_sp<SkSurface> surface;
                if (dContext) {
                    surface = SkSurfaces::RenderTarget(dContext, skgpu::Budgeted::kYes, ii);
                } else {
#if defined(SK_GRAPHITE)
                    surface = SkSurfaces::RenderTarget(recorder, ii);
#endif
                }
 
                if (!surface) {
                    return nullptr;
                }
                render_image(surface->getCanvas());
                return surface->makeImageSnapshot();
            }};
 
    constexpr SkScalar kPad = 5.f;
    canvas->translate(kPad, kPad);
    for (const auto& factory : imageFactories) {
        sk_sp<SkImage> image(factory());
        if (image) {
            for (auto mm : { false, true }) {
                sk_sp<SkImage> texImage;
                if (dContext) {
                    texImage = SkImages::TextureFromImage(dContext,
                                                          image,
                                                          mm ? skgpu::Mipmapped::kYes
                                                             : skgpu::Mipmapped::kNo);
                } else {
#if defined(SK_GRAPHITE)
                    texImage = SkImages::TextureFromImage(recorder, image, {mm});
#endif
                }
                if (texImage) {
                    canvas->drawImage(texImage, 0, mm ? kSize + kPad : 0);
                }
            }
        }
        canvas->translate(kSize + kPad, 0);
    }
 
    return skiagm::DrawResult::kOk;
}

draw_contents() [1/2]

static void draw_contents ( SkCanvas *  canvas )

static

Definition at line 233 of file image.cpp.

                                            {
    SkPaint paint;
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setStrokeWidth(20);
    canvas->drawCircle(50, 50, 35, paint);
}

draw_contents() [2/2]

static void draw_contents ( SkSurface *  surface, SkColor  fillC  )

static

Definition at line 64 of file image.cpp.

                                                             {
    SkSize size = SkSize::Make(SkIntToScalar(surface->width()),
                               SkIntToScalar(surface->height()));
    SkCanvas* canvas = surface->getCanvas();
 
    SkScalar stroke = size.fWidth / 10;
    SkScalar radius = (size.fWidth - stroke) / 2;
 
    SkPaint paint;
 
    paint.setAntiAlias(true);
    paint.setColor(fillC);
    canvas->drawCircle(size.fWidth/2, size.fHeight/2, radius, paint);
 
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setStrokeWidth(stroke);
    paint.setColor(SK_ColorBLACK);
    canvas->drawCircle(size.fWidth/2, size.fHeight/2, radius, paint);
}

draw_pixmap() [1/2]

static void draw_pixmap ( SkCanvas *  canvas, const SkPixmap &  pm, SkScalar  x, SkScalar  y  )

static

Definition at line 431 of file image.cpp.

                                                                                      {
    canvas->drawImage(SkImages::RasterFromPixmapCopy(pm), x, y);
}

draw_pixmap() [2/2]

static void draw_pixmap ( SkCanvas *  canvas, const SkPixmap &  pmap  )

static

Definition at line 200 of file image.cpp.

                                                                {
    SkBitmap bitmap;
    bitmap.installPixels(pmap);
    canvas->drawImage(bitmap.asImage(), 0, 0);
}

make_codec()

static sk_sp< SkImage > make_codec ( const SkImageInfo &  info, GrRecordingContext *  , void(*)(SkCanvas *)  draw  )

static

Definition at line 261 of file image.cpp.

                                                          {
    sk_sp<SkImage> image(make_raster(info, nullptr, draw));
    return SkImages::DeferredFromEncodedData(SkPngEncoder::Encode(nullptr, image.get(), {}));
}

make_gpu()

static sk_sp< SkImage > make_gpu ( const SkImageInfo &  info, GrRecordingContext *  ctx, void(*)(SkCanvas *)  draw  )

static

Definition at line 268 of file image.cpp.

                                                        {
    if (!ctx) {
        return nullptr;
    }
 
    auto surface(SkSurfaces::RenderTarget(ctx, skgpu::Budgeted::kNo, info));
    if (!surface) {
        return nullptr;
    }
 
    draw(surface->getCanvas());
    return surface->makeImageSnapshot();
}

make_lazy_image()

static sk_sp< SkImage > make_lazy_image ( )

static

Definition at line 465 of file image.cpp.

                                        {
    sk_sp<SkPicture> picture;
    {
        SkPictureRecorder recorder;
        SkCanvas* canvas = recorder.beginRecording(SkRect::MakeIWH(200, 200));
        canvas->drawCircle(100, 100, 100, SkPaint());
        picture = recorder.finishRecordingAsPicture();
    }
 
    return SkImages::DeferredFromPicture(std::move(picture),
                                         {200, 200},
                                         /* matrix= */ nullptr,
                                         /* paint= */ nullptr,
                                         SkImages::BitDepth::kU8,
                                         SkColorSpace::MakeSRGB());
}

make_picture()

static sk_sp< SkImage > make_picture ( const SkImageInfo &  info, GrRecordingContext *  , void(*)(SkCanvas *)  draw  )

static

Definition at line 248 of file image.cpp.

                                                            {
    SkPictureRecorder recorder;
    draw(recorder.beginRecording(SkRect::MakeIWH(info.width(), info.height())));
    return SkImages::DeferredFromPicture(recorder.finishRecordingAsPicture(),
                                         info.dimensions(),
                                         nullptr,
                                         nullptr,
                                         SkImages::BitDepth::kU8,
                                         SkColorSpace::MakeSRGB());
}

make_raster()

static sk_sp< SkImage > make_raster ( const SkImageInfo &  info, GrRecordingContext *  , void(*)(SkCanvas *)  draw  )

static

Definition at line 240 of file image.cpp.

                                                           {
    auto surface(SkSurfaces::Raster(info));
    draw(surface->getCanvas());
    return surface->makeImageSnapshot();
}

serial_deserial()

static sk_sp< SkImage > serial_deserial ( SkImage *  img )

static

Definition at line 482 of file image.cpp.

                                                    {
    if (!img) {
        return nullptr;
    }
 
    SkSerialProcs sProcs;
    sProcs.fImageProc = [](SkImage* img, void*) -> sk_sp<SkData> {
        return SkPngEncoder::Encode(as_IB(img)->directContext(), img, SkPngEncoder::Options{});
    };
    SkBinaryWriteBuffer writer(sProcs);
 
    writer.writeImage(img);
    size_t length = writer.bytesWritten();
    auto data = SkData::MakeUninitialized(length);
    writer.writeToMemory(data->writable_data());
 
    SkReadBuffer reader(data->data(), length);
    return reader.readImage();
}

show_scaled_pixels()

static void show_scaled_pixels ( SkCanvas *  canvas, SkImage *  image  )

static

Definition at line 206 of file image.cpp.

                                                                 {
    SkAutoCanvasRestore acr(canvas, true);
 
    canvas->drawImage(image, 0, 0);
    canvas->translate(110, 10);
 
    const SkImageInfo info = SkImageInfo::MakeN32Premul(40, 40);
    SkAutoPixmapStorage storage;
    storage.alloc(info);
 
    const SkImage::CachingHint chints[] = {
        SkImage::kAllow_CachingHint, SkImage::kDisallow_CachingHint,
    };
 
    for (auto ch : chints) {
        canvas->save();
        for (auto s : gSamplings) {
            if (image->scalePixels(storage, s, ch)) {
                draw_pixmap(canvas, storage);
            }
            canvas->translate(70, 0);
        }
        canvas->restore();
        canvas->translate(0, 45);
    }
}

slam_ff()

static void slam_ff ( const SkPixmap &  pm )

static

Definition at line 435 of file image.cpp.

                                        {
    for (int y = 0; y < pm.height(); ++y) {
        for (int x = 0; x < pm.width(); ++x) {
            *pm.writable_addr32(x, y) = *pm.addr32(x, y) | SkPackARGB32(0xFF, 0, 0, 0);
        }
    }
}

test_surface()

static void test_surface ( SkCanvas *  canvas, SkSurface *  surf, bool  usePaint  )

static

Definition at line 84 of file image.cpp.

                                                                           {
    draw_contents(surf, SK_ColorRED);
    sk_sp<SkImage> imgR = surf->makeImageSnapshot();
 
    if (true) {
        sk_sp<SkImage> imgR2 = surf->makeImageSnapshot();
        SkASSERT(imgR == imgR2);
    }
 
    imgR = ToolUtils::MakeTextureImage(canvas, std::move(imgR));
    draw_contents(surf, SK_ColorGREEN);
    sk_sp<SkImage> imgG = ToolUtils::MakeTextureImage(canvas, surf->makeImageSnapshot());
 
    // since we've drawn after we snapped imgR, imgG will be a different obj unless the
    // gpu context has been abandoned (in which case they will both be null)
    SkASSERT(imgR != imgG || (!imgR && !imgG));
 
    draw_contents(surf, SK_ColorBLUE);
 
    SkSamplingOptions sampling;
    SkPaint paint;
 
    canvas->drawImage(imgR, 0, 0, sampling, usePaint ? &paint : nullptr);
    canvas->drawImage(imgG, 0, 80, sampling, usePaint ? &paint : nullptr);
    surf->draw(canvas, 0, 160, SkSamplingOptions(), usePaint ? &paint : nullptr);
 
    SkRect src1, src2, src3;
    src1.setIWH(surf->width(), surf->height());
    src2.setLTRB(SkIntToScalar(-surf->width() / 2), SkIntToScalar(-surf->height() / 2),
                 SkIntToScalar(surf->width()),       SkIntToScalar(surf->height()));
    src3.setIWH(surf->width() / 2, surf->height() / 2);
 
    SkRect dst1, dst2, dst3, dst4;
    dst1.setLTRB(0, 240, 65, 305);
    dst2.setLTRB(0, 320, 65, 385);
    dst3.setLTRB(0, 400, 65, 465);
    dst4.setLTRB(0, 480, 65, 545);
 
    canvas->drawImageRect(imgR, src1, dst1, sampling, usePaint ? &paint : nullptr,
                          SkCanvas::kStrict_SrcRectConstraint);
    canvas->drawImageRect(imgG, src2, dst2, sampling, usePaint ? &paint : nullptr,
                          SkCanvas::kStrict_SrcRectConstraint);
    canvas->drawImageRect(imgR, src3, dst3, sampling, usePaint ? &paint : nullptr,
                          SkCanvas::kStrict_SrcRectConstraint);
    canvas->drawImageRect(imgG, dst4, sampling, usePaint ? &paint : nullptr);
}

Variable Documentation

gSamplings

const SkSamplingOptions gSamplings[]

Initial value:

= {
    SkSamplingOptions(SkFilterMode::kNearest),
    SkSamplingOptions(SkFilterMode::kLinear),
    SkSamplingOptions(SkFilterMode::kLinear, SkMipmapMode::kLinear),
    SkSamplingOptions(SkCubicResampler::Mitchell()),
}

Definition at line 57 of file image.cpp.