Reland of move drawSprite from canvas

gm/spritebitmap.cpp

Index: gm/spritebitmap.cpp
diff --git a/gm/spritebitmap.cpp b/gm/spritebitmap.cpp
index b199371e89a2e0d35b67446ffe303d763d4bde10..4f221d49fc71d808d0d932bb30d4973b174f4d52 100644
--- a/gm/spritebitmap.cpp
+++ b/gm/spritebitmap.cpp
@@ -22,8 +22,8 @@
     canvas.drawCircle(50, 50, 50, paint);
 }
 
-static void draw_2_bitmaps(SkCanvas* canvas, const SkBitmap& bm, bool doClip,
-                           int dx, int dy, SkImageFilter* filter = nullptr) {
+static void draw_1_bitmap(SkCanvas* canvas, const SkBitmap& bm, bool doClip,
+                         int dx, int dy, SkImageFilter* filter = nullptr) {
     SkAutoCanvasRestore acr(canvas, true);
     SkPaint paint;
 
@@ -34,15 +34,6 @@
 
     paint.setImageFilter(filter);
     clipR.inset(5, 5);
-
-    if (doClip) {
-        canvas->save();
-        canvas->clipRect(clipR);
-    }
-    canvas->drawSprite(bm, dx, dy, &paint);
-    if (doClip) {
-        canvas->restore();
-    }
 
     canvas->translate(SkIntToScalar(bm.width() + 20), 0);
 
@@ -83,13 +74,13 @@
         SkScalar sigma = 8;
         SkAutoTUnref<SkImageFilter> filter(SkBlurImageFilter::Create(sigma, sigma));
 
-        draw_2_bitmaps(canvas, bm, false, dx, dy);
+        draw_1_bitmap(canvas, bm, false, dx, dy);
         dy += bm.height() + 20;
-        draw_2_bitmaps(canvas, bm, false, dx, dy, filter);
+        draw_1_bitmap(canvas, bm, false, dx, dy, filter);
         dy += bm.height() + 20;
-        draw_2_bitmaps(canvas, bm, true, dx, dy);
+        draw_1_bitmap(canvas, bm, true, dx, dy);
         dy += bm.height() + 20;
-        draw_2_bitmaps(canvas, bm, true, dx, dy, filter);
+        draw_1_bitmap(canvas, bm, true, dx, dy, filter);
     }
 
 private:
@@ -196,22 +187,6 @@
             canvas->translate(spacer, 0);
             show_image(canvas, image2, offset2);                // not snug
 
-            // Try drawing the original w/ the filter, to see that it "draws" the same as
-            // when we have manually applied the filter (above).
-            {
-                SkPaint paint;
-                paint.setImageFilter(filter);
-
-                SkBitmap bm;
-                image0->asLegacyBitmap(&bm, SkImage::kRO_LegacyBitmapMode);
-                SkPoint loc = { 0, 0 };
-                canvas->translate(spacer, 0);
-                canvas->getTotalMatrix().mapPoints(&loc, 1);
-                canvas->drawSprite(bm, (int)loc.x(), (int)loc.y(), &paint); // like snug
-
-                canvas->translate(spacer, 0);
-                canvas->drawImage(image0, 0, 0, &paint);        // like not snug
-            }
             canvas->restore();
 
             canvas->translate(0, spacer);
@@ -222,152 +197,3 @@
     typedef GM INHERITED;
 };
 DEF_GM( return new ApplyFilterGM; )
-
-//////////////////////
-
-#include "SkDisplacementMapEffect.h"
-#include "SkMatrixConvolutionImageFilter.h"
-
-static SkPMColor max_component(SkPMColor a, SkPMColor b) {
-    int dr = SkAbs32(SkGetPackedR32(a) - SkGetPackedR32(b));
-    int dg = SkAbs32(SkGetPackedG32(a) - SkGetPackedG32(b));
-    int db = SkAbs32(SkGetPackedB32(a) - SkGetPackedB32(b));
-    int d = SkTMax(dr, SkTMax(dg, db));
-    d = 0xFF - d;
-    return SkPackARGB32(0xFF, d, d, d);
-}
-
-static SkImage* compute_diff(SkImage* a, SkImage* b) {
-    SkASSERT(a->width() == b->width() && a->height() == b->height());
-    const SkImageInfo info = SkImageInfo::MakeN32Premul(a->width(), a->height());
-    SkBitmap bma, bmb, bmdiff;
-    bma.allocPixels(info);
-    bmb.allocPixels(info);
-    bmdiff.allocPixels(info);
-
-    a->readPixels(info, bma.getPixels(), bma.rowBytes(), 0, 0);
-    b->readPixels(info, bmb.getPixels(), bmb.rowBytes(), 0, 0);
-    for (int y = 0; y < info.height(); ++y) {
-        for (int x = 0; x < info.width(); ++x) {
-            *bmdiff.getAddr32(x, y) = max_component(*bma.getAddr32(x, y), *bmb.getAddr32(x, y));
-        }
-    }
-    bmdiff.setImmutable();  // avoid the copy
-    return SkImage::NewFromBitmap(bmdiff);
-}
-
-static SkImage* make_native_red_oval(SkCanvas* rootCanvas) {
-    SkImageInfo info = SkImageInfo::MakeN32Premul(160, 90);
-    SkAutoTUnref<SkSurface> surface(rootCanvas->newSurface(info));
-    if (!surface) {
-        surface.reset(SkSurface::NewRaster(info));
-    }
-
-    SkPaint paint;
-    paint.setAntiAlias(true);
-    paint.setColor(SK_ColorRED);
-    surface->getCanvas()->drawOval(SkRect::MakeWH(160, 90), paint);
-    return surface->newImageSnapshot();
-}
-
-
-static SkSurface* make_surface(SkCanvas* factory, const SkImageInfo& info) {
-    SkSurface* surface = factory->newSurface(info);
-    if (!surface) {
-        surface = SkSurface::NewRaster(info);
-    }
-    return surface;
-}
-
-template <typename DrawProc> SkImage* snapshot(SkCanvas* canvas, const SkImageInfo& info,
-                                               DrawProc p) {
-    SkAutoTUnref<SkSurface> surface(make_surface(canvas, info));
-    p(surface->getCanvas());
-    return surface->newImageSnapshot();
-}
-
-/**
- *  Try drawing an image+imagefilter in two different ways
- *  1. as drawSprite
- *  2. as drawImage + clipped to image bounds
- *  The two should draw the same. To try to visualize this, we draw a 4th column of the difference
- *  between the two versions. If it is all black (where there is alpha), they drew the same!
- */
-class DrawWithFilterGM : public skiagm::GM {
-public:
-    DrawWithFilterGM() {}
-
-protected:
-    SkString onShortName() override {
-        return SkString("draw-with-filter");
-    }
-
-    SkISize onISize() override {
-        return SkISize::Make(780, 780);
-    }
-
-    void onDraw(SkCanvas* canvas) override {
-        SkAutoTUnref<SkImage> image0(make_native_red_oval(canvas));
-        SkAutoTUnref<SkImage> image1(make_native_red_oval(canvas));
-
-        const ImageFilterFactory factories[] = {
-            IFCCast([]{ return SkBlurImageFilter::Create(8, 8); }),
-            IFCCast([]{ SkAutoTUnref<SkColorFilter> cf(SkModeColorFilter::Create(SK_ColorBLUE,
-                                                                         SkXfermode::kSrcIn_Mode));
-                return SkColorFilterImageFilter::Create(cf);
-            }),
-            IFCCast([]{ return SkDilateImageFilter::Create(8, 8); }),
-            IFCCast([]{ return SkErodeImageFilter::Create(8, 8); }),
-            IFCCast([]{ return SkOffsetImageFilter::Create(8, 8); }),
-
-            IFCCast([]{ return (SkImageFilter*)SkDisplacementMapEffect::Create(
-                                                   SkDisplacementMapEffect::kR_ChannelSelectorType,
-                                                   SkDisplacementMapEffect::kG_ChannelSelectorType,
-                                                   10, nullptr); }),
-            IFCCast([]{
-                const SkScalar kernel[] = { 1, 1, 1, 1, -7, 1, 1, 1, 1 };
-                return (SkImageFilter*)SkMatrixConvolutionImageFilter::Create(
-                                                  SkISize::Make(3, 3),
-                                                  kernel, 1, 0,
-                                                  SkIPoint::Make(0, 0),
-                                                  SkMatrixConvolutionImageFilter::kClamp_TileMode,
-                                                  true); }),
-        };
-
-        const SkScalar dx = 180;
-        const SkScalar dy = 110;
-        const SkImageInfo info = SkImageInfo::MakeN32Premul(image0->width(), image0->height());
-
-        canvas->translate(20, 20);
-        for (auto&& factory : factories) {
-            SkAutoTUnref<SkImageFilter> filter(factory());
-            SkPaint paint;
-            paint.setImageFilter(filter);
-
-            SkAutoTUnref<SkImage> snap0(snapshot(canvas, info, [&](SkCanvas* c) {
-                c->drawImage(image0, 0, 0, &paint);
-            }));
-            canvas->drawImage(snap0, 0, 0);
-
-            SkAutoTUnref<SkImage> snap1(snapshot(canvas, info, [&](SkCanvas* c) {
-                SkBitmap bm;
-                image1->asLegacyBitmap(&bm, SkImage::kRO_LegacyBitmapMode);
-                c->drawSprite(bm, 0, 0, &paint);
-            }));
-            canvas->drawImage(snap1, dx, 0);
-
-            SkAutoTUnref<SkImage> diff(snapshot(canvas, info, [&](SkCanvas* c) {
-                SkAutoTUnref<SkImage> diff(compute_diff(snap0, snap1));
-                c->drawImage(diff, 0, 0);
-            }));
-            canvas->drawImage(diff, 2*dx, 0);
-
-            canvas->translate(0, dy);
-        }
-    }
-    
-private:
-    typedef GM INHERITED;
-};
-DEF_GM( return new DrawWithFilterGM; )
-