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/*
* Copyright 2012 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/SkFont.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypeface.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkImageFilters.h"
#include "tools/ToolUtils.h"
#include <vector>
namespace skiagm {
enum KernelFixture {
kBasic_KernelFixture,
kLarge_KernelFixture
};
class MatrixConvolutionGM : public GM {
public:
MatrixConvolutionGM(SkColor colorOne, SkColor colorTwo, KernelFixture kernelFixture, const char* nameSuffix)
: fNameSuffix(nameSuffix),
fKernelFixture(kernelFixture) {
this->setBGColor(0x00000000);
fColors[0] = colorOne;
fColors[1] = colorTwo;
}
protected:
SkString onShortName() override {
return SkStringPrintf("matrixconvolution%s", fNameSuffix);
}
void makeBitmap() {
// Draw our bitmap in N32, so legacy devices get "premul" values they understand
fBitmap.allocN32Pixels(80, 80);
SkCanvas canvas(fBitmap);
canvas.clear(0x00000000);
SkPaint paint;
paint.setColor(0xFFFFFFFF);
SkPoint pts[2] = { {0, 0},
{0, 80.0f} };
SkScalar pos[2] = { 0, 80.0f };
paint.setShader(SkGradientShader::MakeLinear(
pts, fColors, pos, 2, SkTileMode::kClamp));
SkFont font(ToolUtils::create_portable_typeface(), 180.0f);
canvas.drawString("e", -10.0f, 80.0f, font, paint);
}
SkISize onISize() override {
return SkISize::Make(500, 300);
}
sk_sp<SkImageFilter> makeFilter(const SkIPoint &kernelOffset, SkTileMode tileMode,
bool convolveAlpha, const SkIRect *cropRect = nullptr) {
switch (fKernelFixture) {
case kBasic_KernelFixture: {
// All 1s except center value, which is -7 (sum of 1).
std::vector<SkScalar> kernel(9, SkIntToScalar(1));
kernel[4] = SkIntToScalar(-7);
return SkImageFilters::MatrixConvolution({3,3}, kernel.data(), /* gain */ 0.3f, /* bias */ SkIntToScalar(100), kernelOffset, tileMode, convolveAlpha, nullptr, cropRect);
}
case kLarge_KernelFixture: {
// Intentionally go over the MAX_KERNEL_SIZE limit and trigger CPU fallback.
// All 1s except center value, which is -47 (sum of 1).
std::vector<SkScalar> kernel(49, SkIntToScalar(1));
kernel[24] = SkIntToScalar(-47);
return SkImageFilters::MatrixConvolution({7,7}, kernel.data(), /* gain */ 0.3f, /* bias */ SkIntToScalar(100), kernelOffset, tileMode, convolveAlpha, nullptr, cropRect);
}
default:
return nullptr;
}
}
void draw(SkCanvas* canvas, int x, int y, const SkIPoint& kernelOffset,
SkTileMode tileMode, bool convolveAlpha,
const SkIRect* cropRect = nullptr) {
SkPaint paint;
paint.setImageFilter(this->makeFilter(kernelOffset, tileMode, convolveAlpha, cropRect));
canvas->save();
canvas->translate(SkIntToScalar(x), SkIntToScalar(y));
const SkRect layerBounds = SkRect::MakeIWH(fBitmap.width(), fBitmap.height());
canvas->clipRect(layerBounds);
// This GM is, in part, intended to display the wrapping behavior of the
// matrix image filter. The only (rational) way to achieve that for repeat mode
// is to create a tight layer.
canvas->saveLayer(layerBounds, &paint);
canvas->drawBitmap(fBitmap, 0, 0, nullptr);
canvas->restore();
canvas->restore();
}
void onOnceBeforeDraw() override {
this->makeBitmap();
}
void onDraw(SkCanvas* canvas) override {
canvas->clear(SK_ColorBLACK);
SkIPoint kernelOffset = SkIPoint::Make(1, 0);
SkIRect rect = fBitmap.bounds();
for (int x = 10; x < 310; x += 100) {
this->draw(canvas, x, 10, kernelOffset, SkTileMode::kClamp, true, &rect);
this->draw(canvas, x, 110, kernelOffset, SkTileMode::kDecal, true, &rect);
this->draw(canvas, x, 210, kernelOffset, SkTileMode::kRepeat, true, &rect);
kernelOffset.fY++;
}
kernelOffset.fY = 1;
SkIRect smallRect = SkIRect::MakeXYWH(10, 5, 60, 60);
this->draw(canvas, 310, 10, kernelOffset, SkTileMode::kClamp, true, &smallRect);
this->draw(canvas, 310, 110, kernelOffset, SkTileMode::kDecal, true, &smallRect);
this->draw(canvas, 310, 210, kernelOffset, SkTileMode::kRepeat, true, &smallRect);
this->draw(canvas, 410, 10, kernelOffset, SkTileMode::kClamp, false, &rect);
this->draw(canvas, 410, 110, kernelOffset, SkTileMode::kDecal, false, &rect);
this->draw(canvas, 410, 210, kernelOffset, SkTileMode::kRepeat, false, &rect);
}
private:
SkBitmap fBitmap;
SkColor fColors[2];
const char* fNameSuffix;
KernelFixture fKernelFixture;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new MatrixConvolutionGM(0xFFFFFFFF, 0x40404040, KernelFixture::kBasic_KernelFixture, "");)
DEF_GM(return new MatrixConvolutionGM(0xFFFF0000, 0xFF00FF00, KernelFixture::kBasic_KernelFixture, "_color");)
DEF_GM(return new MatrixConvolutionGM(0xFFFFFFFF, 0x40404040, KernelFixture::kLarge_KernelFixture, "_big");)
DEF_GM(return new MatrixConvolutionGM(0xFFFF0000, 0xFF00FF00, KernelFixture::kLarge_KernelFixture, "_big_color");)
}