104 lines
3.0 KiB
C++
104 lines
3.0 KiB
C++
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/*
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* Copyright 2015 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm.h"
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#include "SkCanvas.h"
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#include "SkRSXform.h"
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#include "SkSurface.h"
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class DrawAtlasGM : public skiagm::GM {
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static SkImage* MakeAtlas(SkCanvas* caller, const SkRect& target) {
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SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
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SkAutoTUnref<SkSurface> surface(caller->newSurface(info));
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if (NULL == surface) {
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surface.reset(SkSurface::NewRaster(info));
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}
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SkCanvas* canvas = surface->getCanvas();
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// draw red everywhere, but we don't expect to see it in the draw, testing the notion
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// that drawAtlas draws a subset-region of the atlas.
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canvas->clear(SK_ColorRED);
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SkPaint paint;
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paint.setXfermodeMode(SkXfermode::kClear_Mode);
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SkRect r(target);
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r.inset(-1, -1);
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// zero out a place (with a 1-pixel border) to land our drawing.
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canvas->drawRect(r, paint);
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paint.setXfermode(NULL);
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paint.setColor(SK_ColorBLUE);
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paint.setAntiAlias(true);
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canvas->drawOval(target, paint);
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return surface->newImageSnapshot();
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}
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SkAutoTUnref<SkImage> fAtlas;
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public:
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DrawAtlasGM() {}
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protected:
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SkString onShortName() override {
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return SkString("draw-atlas");
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}
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SkISize onISize() override {
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return SkISize::Make(640, 480);
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}
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void onDraw(SkCanvas* canvas) override {
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const SkRect target = { 50, 50, 80, 90 };
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if (NULL == fAtlas) {
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fAtlas.reset(MakeAtlas(canvas, target));
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}
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const struct {
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SkScalar fScale;
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SkScalar fDegrees;
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SkScalar fTx;
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SkScalar fTy;
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void apply(SkRSXform* xform) const {
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const SkScalar rad = SkDegreesToRadians(fDegrees);
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xform->fSCos = fScale * SkScalarCos(rad);
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xform->fSSin = fScale * SkScalarSin(rad);
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xform->fTx = fTx;
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xform->fTy = fTy;
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}
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} rec[] = {
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{ 1, 0, 10, 10 }, // just translate
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{ 2, 0, 110, 10 }, // scale + translate
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{ 1, 30, 210, 10 }, // rotate + translate
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{ 2, -30, 310, 30 }, // scale + rotate + translate
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};
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const int N = SK_ARRAY_COUNT(rec);
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SkRSXform xform[N];
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SkRect tex[N];
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SkColor colors[N];
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for (int i = 0; i < N; ++i) {
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rec[i].apply(&xform[i]);
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tex[i] = target;
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colors[i] = 0x80FF0000 + (i * 40 * 256);
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}
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SkPaint paint;
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paint.setFilterQuality(kLow_SkFilterQuality);
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paint.setAntiAlias(true);
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canvas->drawAtlas(fAtlas, xform, tex, N, NULL, &paint);
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canvas->translate(0, 100);
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canvas->drawAtlas(fAtlas, xform, tex, colors, N, SkXfermode::kSrcIn_Mode, NULL, &paint);
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}
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private:
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typedef GM INHERITED;
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};
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DEF_GM( return new DrawAtlasGM; )
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