| /* |
| * Copyright 2014 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/SkColorFilter.h" |
| #include "include/core/SkImage.h" |
| #include "include/core/SkImageFilter.h" |
| #include "include/core/SkPaint.h" |
| #include "include/core/SkPoint.h" |
| #include "include/core/SkPoint3.h" |
| #include "include/core/SkRect.h" |
| #include "include/core/SkRefCnt.h" |
| #include "include/core/SkScalar.h" |
| #include "include/core/SkShader.h" |
| #include "include/core/SkSurface.h" |
| #include "include/core/SkTileMode.h" |
| #include "include/effects/SkGradientShader.h" |
| #include "include/effects/SkImageFilters.h" |
| |
| #include <utility> |
| |
| namespace { |
| |
| sk_sp<SkImage> make_checkerboard(); |
| sk_sp<SkImage> make_gradient_circle(int width, int height); |
| void draw(SkCanvas*, sk_sp<SkImage>, const SkIRect&, sk_sp<SkImageFilter>); |
| |
| } // namespace |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_SIMPLE_GM(imagefilterscropexpand, canvas, 730, 650) { |
| SkIRect cropRect = SkIRect::MakeXYWH(10, 10, 44, 44); |
| |
| sk_sp<SkImage> gradientCircle(make_gradient_circle(64, 64)); |
| auto checkerboard = make_checkerboard(); |
| |
| sk_sp<SkImageFilter> gradientCircleSource(SkImageFilters::Image(std::move(gradientCircle), |
| SkFilterMode::kLinear)); |
| sk_sp<SkImageFilter> noopCropped(SkImageFilters::Offset(0, 0, nullptr, &cropRect)); |
| // This color matrix saturates the green component but only partly increases the opacity. |
| // For the opaque checkerboard, the opacity boost doesn't matter but it does impact the |
| // area outside the checkerboard. |
| float matrix[20] = { 1, 0, 0, 0, 0, |
| 0, 1, 0, 0, 1, |
| 0, 0, 1, 0, 0, |
| 0, 0, 0, 1, 32.0f/255 }; |
| sk_sp<SkColorFilter> cfAlphaTrans(SkColorFilters::Matrix(matrix)); |
| |
| SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64)); |
| SkScalar MARGIN = SkIntToScalar(12); |
| |
| SkPoint3 pointLocation = SkPoint3::Make(0, 0, SkIntToScalar(10)); |
| SkScalar kd = SkIntToScalar(2); |
| SkScalar surfaceScale = SkIntToScalar(1); |
| SkIRect bounds; |
| r.roundOut(&bounds); |
| |
| SkPaint paint; |
| canvas->translate(MARGIN, MARGIN); |
| for (int outset = -15; outset <= 20; outset += 5) { |
| canvas->save(); |
| SkIRect bigRect = cropRect; |
| bigRect.outset(outset, outset); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::ColorFilter(cfAlphaTrans, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::Blur(0.3f, 0.3f, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::Blur(8.0f, 8.0f, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::Dilate(2, 2, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::Erode(2, 2, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::DropShadow(10, 10, 3, 3, SK_ColorBLUE, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::DisplacementMap(SkColorChannel::kR, SkColorChannel::kR, 12, |
| gradientCircleSource, noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::Offset(SkIntToScalar(-8), SkIntToScalar(16), noopCropped, &bigRect)); |
| |
| draw(canvas, checkerboard, bigRect, |
| SkImageFilters::PointLitDiffuse(pointLocation, SK_ColorWHITE, surfaceScale, kd, |
| noopCropped, &bigRect)); |
| |
| canvas->restore(); |
| canvas->translate(0, SkIntToScalar(80)); |
| } |
| } |
| |
| namespace { |
| sk_sp<SkImage> make_checkerboard() { |
| auto surf = SkSurfaces::Raster(SkImageInfo::MakeN32Premul(64, 64)); |
| auto canvas = surf->getCanvas(); |
| canvas->clear(0xFFFF0000); |
| SkPaint darkPaint; |
| darkPaint.setColor(0xFF404040); |
| SkPaint lightPaint; |
| lightPaint.setColor(0xFFA0A0A0); |
| for (int y = 8; y < 48; y += 16) { |
| for (int x = 8; x < 48; 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(); |
| } |
| } |
| return surf->makeImageSnapshot(); |
| } |
| |
| sk_sp<SkImage> make_gradient_circle(int width, int height) { |
| SkScalar x = SkIntToScalar(width / 2); |
| SkScalar y = SkIntToScalar(height / 2); |
| SkScalar radius = std::min(x, y) * 0.8f; |
| auto surface(SkSurfaces::Raster(SkImageInfo::MakeN32Premul(width, height))); |
| SkCanvas* canvas = surface->getCanvas(); |
| canvas->clear(0x00000000); |
| SkColor colors[2]; |
| colors[0] = SK_ColorWHITE; |
| colors[1] = SK_ColorBLACK; |
| SkPaint paint; |
| paint.setShader(SkGradientShader::MakeRadial(SkPoint::Make(x, y), radius, colors, nullptr, |
| 2, SkTileMode::kClamp)); |
| canvas->drawCircle(x, y, radius, paint); |
| |
| return surface->makeImageSnapshot(); |
| } |
| |
| void draw(SkCanvas* canvas, sk_sp<SkImage> image, const SkIRect& layerRect, |
| sk_sp<SkImageFilter> filter) { |
| SkPaint paint; |
| paint.setImageFilter(std::move(filter)); |
| |
| // We don't pass 'layerRect' in as the saveLayer bounds hint because that is not the |
| // pre-filtering local bounds (which would be image->dimensions()). We could clip before |
| // the saveLayer but every 'filter' should have been constructed with a crop rect equal |
| // to 'layerRect', so do an unclipped saveLayer to ensure that the crop rect itself is |
| // what restricts the output of the filter. |
| canvas->saveLayer(nullptr, &paint); |
| canvas->drawImage(image, 0, 0); |
| canvas->restore(); |
| |
| SkPaint strokePaint; |
| strokePaint.setColor(0xFFFF0000); |
| strokePaint.setStyle(SkPaint::kStroke_Style); |
| canvas->drawRect(SkRect::Make(layerRect), strokePaint); |
| |
| canvas->translate(SkIntToScalar(80), 0); |
| } |
| } // namespace |