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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/gm.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkFont.h"
#include "include/core/SkImage.h"
#include "include/core/SkImageFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPicture.h"
#include "include/core/SkPictureRecorder.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTypeface.h"
#include "include/effects/SkImageFilters.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
// This GM exercises the SkPictureImageFilter ImageFilter class.
static void fill_rect_filtered(SkCanvas* canvas,
const SkRect& clipRect,
sk_sp<SkImageFilter> filter) {
SkPaint paint;
paint.setImageFilter(filter);
canvas->save();
canvas->clipRect(clipRect);
canvas->drawPaint(paint);
canvas->restore();
}
static sk_sp<SkPicture> make_picture() {
SkPictureRecorder recorder;
SkCanvas* canvas = recorder.beginRecording(100, 100);
SkPaint paint;
paint.setColor(0xFFFFFFFF);
SkFont font(ToolUtils::DefaultPortableTypeface(), 96.0f);
canvas->drawString("e", 20.0f, 70.0f, font, paint);
return recorder.finishRecordingAsPicture();
}
// Create a picture that will draw LCD text
static sk_sp<SkPicture> make_LCD_picture() {
SkPictureRecorder recorder;
SkCanvas* canvas = recorder.beginRecording(100, 100);
canvas->clear(SK_ColorTRANSPARENT);
SkPaint paint;
paint.setColor(0xFFFFFFFF);
// this has to be small enough that it doesn't become a path
SkFont font(ToolUtils::DefaultPortableTypeface(), 36.0f);
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
canvas->drawString("e", 20.0f, 70.0f, font, paint);
return recorder.finishRecordingAsPicture();
}
class PictureImageFilterGM : public skiagm::GM {
public:
PictureImageFilterGM() { }
protected:
SkString getName() const override { return SkString("pictureimagefilter"); }
SkISize getISize() override { return SkISize::Make(600, 300); }
void onOnceBeforeDraw() override {
fPicture = make_picture();
fLCDPicture = make_LCD_picture();
}
sk_sp<SkImageFilter> make(sk_sp<SkPicture> pic, SkRect r, const SkSamplingOptions& sampling) {
SkISize dim = { SkScalarRoundToInt(r.width()), SkScalarRoundToInt(r.height()) };
auto img = SkImages::DeferredFromPicture(
pic, dim, nullptr, nullptr, SkImages::BitDepth::kU8, SkColorSpace::MakeSRGB());
return SkImageFilters::Image(img, r, r, sampling);
}
sk_sp<SkImageFilter> make(const SkSamplingOptions& sampling) {
return make(fPicture, fPicture->cullRect(), sampling);
}
void onDraw(SkCanvas* canvas) override {
canvas->clear(SK_ColorGRAY);
{
SkRect srcRect = SkRect::MakeXYWH(20, 20, 30, 30);
SkRect emptyRect = SkRect::MakeXYWH(20, 20, 0, 0);
SkRect bounds = SkRect::MakeXYWH(0, 0, 100, 100);
sk_sp<SkImageFilter> pictureSource(SkImageFilters::Picture(fPicture));
sk_sp<SkImageFilter> pictureSourceSrcRect(SkImageFilters::Picture(fPicture, srcRect));
sk_sp<SkImageFilter> pictureSourceEmptyRect(SkImageFilters::Picture(fPicture,
emptyRect));
sk_sp<SkImageFilter> pictureSourceResampled = make(SkSamplingOptions(SkFilterMode::kLinear));
sk_sp<SkImageFilter> pictureSourcePixelated = make(SkSamplingOptions());
canvas->save();
// Draw the picture unscaled.
fill_rect_filtered(canvas, bounds, pictureSource);
canvas->translate(SkIntToScalar(100), 0);
// Draw an unscaled subset of the source picture.
fill_rect_filtered(canvas, bounds, pictureSourceSrcRect);
canvas->translate(SkIntToScalar(100), 0);
// Draw the picture to an empty rect (should draw nothing).
fill_rect_filtered(canvas, bounds, pictureSourceEmptyRect);
canvas->translate(SkIntToScalar(100), 0);
// Draw the LCD picture to a layer
{
SkPaint stroke;
stroke.setStyle(SkPaint::kStroke_Style);
canvas->drawRect(bounds, stroke);
SkPaint paint;
paint.setImageFilter(make(fLCDPicture, fPicture->cullRect(), SkSamplingOptions()));
canvas->scale(4, 4);
canvas->translate(-0.9f*srcRect.fLeft, -2.45f*srcRect.fTop);
canvas->saveLayer(&bounds, &paint);
canvas->restore();
}
canvas->restore();
// Draw the picture scaled
canvas->translate(0, SkIntToScalar(100));
canvas->scale(200 / srcRect.width(), 200 / srcRect.height());
canvas->translate(-srcRect.fLeft, -srcRect.fTop);
fill_rect_filtered(canvas, srcRect, pictureSource);
// Draw the picture scaled, but rasterized at original resolution
canvas->translate(srcRect.width(), 0);
fill_rect_filtered(canvas, srcRect, pictureSourceResampled);
// Draw the picture scaled, pixelated
canvas->translate(srcRect.width(), 0);
fill_rect_filtered(canvas, srcRect, pictureSourcePixelated);
}
}
private:
sk_sp<SkPicture> fPicture;
sk_sp<SkPicture> fLCDPicture;
using INHERITED = GM;
};
///////////////////////////////////////////////////////////////////////////////
DEF_GM( return new PictureImageFilterGM; )