badpaint.cpp

Go to the documentation of this file.

/*
 * 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/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkRect.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/private/base/SkTArray.h"
 
using namespace skia_private;
 
/** This GM draws with invalid paints. It should draw nothing other than the background. */
class BadPaintGM : public skiagm::GM {
 public:
    BadPaintGM() {}
 
protected:
    SkString getName() const override { return SkString("badpaint"); }
 
    SkISize getISize() override { return SkISize::Make(100, 100); }
 
    void onOnceBeforeDraw() override {
        SkBitmap emptyBmp;
 
        SkBitmap blueBmp;
        blueBmp.allocN32Pixels(10, 10);
        blueBmp.eraseColor(SK_ColorBLUE);
 
        SkMatrix badMatrix;
        badMatrix.setAll(0, 0, 0, 0, 0, 0, 0, 0, 0);
 
        // Empty bitmap.
        fPaints.push_back().setColor(SK_ColorGREEN);
        fPaints.back().setShader(emptyBmp.makeShader(SkSamplingOptions()));
 
        // Non-invertible local matrix.
        fPaints.push_back().setColor(SK_ColorGREEN);
        fPaints.back().setShader(blueBmp.makeShader(SkSamplingOptions(), badMatrix));
    }
 
    void onDraw(SkCanvas* canvas) override {
        SkRect rect = SkRect::MakeXYWH(10, 10, 80, 80);
        for (int i = 0; i < fPaints.size(); ++i) {
            canvas->drawRect(rect, fPaints[i]);
        }
    }
 
private:
    TArray<SkPaint> fPaints;
 
    using INHERITED = skiagm::GM;
};
 
/////////////////////////////////////////////////////////////////////////////////////
 
DEF_GM(return new BadPaintGM;)