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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkOffsetImageFilter.h"
#include "SkBitmapSource.h"
#define WIDTH 600
#define HEIGHT 100
#define MARGIN 12
namespace skiagm {
class OffsetImageFilterGM : public GM {
public:
OffsetImageFilterGM() : fInitialized(false) {
this->setBGColor(0xFF000000);
}
protected:
virtual SkString onShortName() {
return SkString("offsetimagefilter");
}
void make_bitmap() {
fBitmap.allocN32Pixels(80, 80);
SkCanvas canvas(fBitmap);
canvas.clear(0x00000000);
SkPaint paint;
paint.setAntiAlias(true);
paint.setColor(0xD000D000);
paint.setTextSize(SkIntToScalar(96));
const char* str = "e";
canvas.drawText(str, strlen(str), SkIntToScalar(15), SkIntToScalar(65), paint);
}
void make_checkerboard() {
fCheckerboard.allocN32Pixels(80, 80);
SkCanvas canvas(fCheckerboard);
canvas.clear(0x00000000);
SkPaint darkPaint;
darkPaint.setColor(0xFF404040);
SkPaint lightPaint;
lightPaint.setColor(0xFFA0A0A0);
for (int y = 0; y < 80; y += 16) {
for (int x = 0; x < 80; x += 16) {
canvas.save();
canvas.translate(SkIntToScalar(x), SkIntToScalar(y));
canvas.drawRect(SkRect::MakeXYWH(0, 0, 8, 8), darkPaint);
canvas.drawRect(SkRect::MakeXYWH(8, 0, 8, 8), lightPaint);
canvas.drawRect(SkRect::MakeXYWH(0, 8, 8, 8), lightPaint);
canvas.drawRect(SkRect::MakeXYWH(8, 8, 8, 8), darkPaint);
canvas.restore();
}
}
}
virtual SkISize onISize() {
return SkISize::Make(WIDTH, HEIGHT);
}
void drawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, SkScalar scale, const SkIRect& cropRect) {
canvas->save();
SkRect clipRect = SkRect::MakeWH(
SkIntToScalar(bitmap.width()), SkIntToScalar(bitmap.height()));
canvas->clipRect(clipRect);
canvas->scale(scale, scale);
canvas->drawBitmap(bitmap, 0, 0, &paint);
canvas->restore();
SkPaint strokePaint;
strokePaint.setStyle(SkPaint::kStroke_Style);
strokePaint.setColor(SK_ColorRED);
// Draw a boundary rect around the intersection of the clip rect
// and crop rect.
SkMatrix scaleMatrix;
scaleMatrix.setScale(scale, scale);
SkRect cropRectFloat;
scaleMatrix.mapRect(&cropRectFloat, SkRect::Make(cropRect));
clipRect.intersect(cropRectFloat);
canvas->drawRect(clipRect, strokePaint);
}
virtual void onDraw(SkCanvas* canvas) {
if (!fInitialized) {
make_bitmap();
make_checkerboard();
fInitialized = true;
}
canvas->clear(0x00000000);
SkPaint paint;
for (int i = 0; i < 4; i++) {
SkBitmap* bitmap = (i & 0x01) ? &fCheckerboard : &fBitmap;
SkIRect cropRect = SkIRect::MakeXYWH(i * 12,
i * 8,
bitmap->width() - i * 8,
bitmap->height() - i * 12);
SkImageFilter::CropRect rect(SkRect::Make(cropRect));
SkAutoTUnref<SkImageFilter> tileInput(SkBitmapSource::Create(*bitmap));
SkScalar dx = SkIntToScalar(i*5);
SkScalar dy = SkIntToScalar(i*10);
SkAutoTUnref<SkImageFilter> filter(
SkOffsetImageFilter::Create(dx, dy, tileInput, &rect));
paint.setImageFilter(filter);
drawClippedBitmap(canvas, *bitmap, paint, SK_Scalar1, cropRect);
canvas->translate(SkIntToScalar(bitmap->width() + MARGIN), 0);
}
SkIRect cropRect = SkIRect::MakeXYWH(0, 0, 100, 100);
SkImageFilter::CropRect rect(SkRect::Make(cropRect));
SkAutoTUnref<SkImageFilter> filter(
SkOffsetImageFilter::Create(SkIntToScalar(-5), SkIntToScalar(-10), NULL, &rect));
paint.setImageFilter(filter);
drawClippedBitmap(canvas, fBitmap, paint, SkIntToScalar(2), cropRect);
}
private:
typedef GM INHERITED;
SkBitmap fBitmap, fCheckerboard;
bool fInitialized;
};
//////////////////////////////////////////////////////////////////////////////
static GM* MyFactory(void*) { return new OffsetImageFilterGM; }
static GMRegistry reg(MyFactory);
}
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