/* * 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/SkBitmap.h" #include "include/core/SkBlendMode.h" #include "include/core/SkCanvas.h" #include "include/core/SkColor.h" #include "include/core/SkImage.h" #include "include/core/SkImageFilter.h" #include "include/core/SkPaint.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/SkTypes.h" #include "include/effects/SkImageFilters.h" #include "tools/ToolUtils.h" #include #define WIDTH 600 #define HEIGHT 700 #define MARGIN 12 namespace skiagm { class XfermodeImageFilterGM : public GM { public: XfermodeImageFilterGM(){ this->setBGColor(0xFF000000); } protected: SkString onShortName() override { return SkString("xfermodeimagefilter"); } SkISize onISize() override { return SkISize::Make(WIDTH, HEIGHT); } void onOnceBeforeDraw() override { fBitmap = ToolUtils::create_string_bitmap(80, 80, 0xD000D000, 15, 65, 96, "e"); fCheckerboard = SkImage::MakeFromBitmap( ToolUtils::create_checkerboard_bitmap(80, 80, 0xFFA0A0A0, 0xFF404040, 8)); } void onDraw(SkCanvas* canvas) override { canvas->clear(SK_ColorBLACK); SkPaint paint; const SkBlendMode gModes[] = { SkBlendMode::kClear, SkBlendMode::kSrc, SkBlendMode::kDst, SkBlendMode::kSrcOver, SkBlendMode::kDstOver, SkBlendMode::kSrcIn, SkBlendMode::kDstIn, SkBlendMode::kSrcOut, SkBlendMode::kDstOut, SkBlendMode::kSrcATop, SkBlendMode::kDstATop, SkBlendMode::kXor, SkBlendMode::kPlus, SkBlendMode::kModulate, SkBlendMode::kScreen, SkBlendMode::kOverlay, SkBlendMode::kDarken, SkBlendMode::kLighten, SkBlendMode::kColorDodge, SkBlendMode::kColorBurn, SkBlendMode::kHardLight, SkBlendMode::kSoftLight, SkBlendMode::kDifference, SkBlendMode::kExclusion, SkBlendMode::kMultiply, SkBlendMode::kHue, SkBlendMode::kSaturation, SkBlendMode::kColor, SkBlendMode::kLuminosity, }; int x = 0, y = 0; sk_sp background(SkImageFilters::Image(fCheckerboard)); for (size_t i = 0; i < SK_ARRAY_COUNT(gModes); i++) { paint.setImageFilter(SkImageFilters::Xfermode(gModes[i], background)); DrawClippedBitmap(canvas, fBitmap, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } } // Test arithmetic mode as image filter paint.setImageFilter(SkImageFilters::Arithmetic(0, 1, 1, 0, true, background, nullptr)); DrawClippedBitmap(canvas, fBitmap, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } // Test nullptr mode paint.setImageFilter(SkImageFilters::Xfermode(SkBlendMode::kSrcOver, background)); DrawClippedBitmap(canvas, fBitmap, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } SkRect clipRect = SkRect::MakeWH(SkIntToScalar(fBitmap.width() + 4), SkIntToScalar(fBitmap.height() + 4)); // Test offsets on SrcMode (uses fixed-function blend) sk_sp bitmapImage(SkImage::MakeFromBitmap(fBitmap)); sk_sp foreground(SkImageFilters::Image(std::move(bitmapImage))); sk_sp offsetForeground(SkImageFilters::Offset(4, -4, foreground)); sk_sp offsetBackground(SkImageFilters::Offset(4, 4, background)); paint.setImageFilter(SkImageFilters::Xfermode( SkBlendMode::kSrcOver, offsetBackground, offsetForeground)); DrawClippedPaint(canvas, clipRect, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } // Test offsets on Darken (uses shader blend) paint.setImageFilter(SkImageFilters::Xfermode( SkBlendMode::kDarken, offsetBackground, offsetForeground)); DrawClippedPaint(canvas, clipRect, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } // Test cropping constexpr size_t nbSamples = 3; const SkBlendMode sampledModes[nbSamples] = { SkBlendMode::kOverlay, SkBlendMode::kSrcOver, SkBlendMode::kPlus }; int offsets[nbSamples][4] = {{ 10, 10, -16, -16}, { 10, 10, 10, 10}, {-10, -10, -6, -6}}; for (size_t i = 0; i < nbSamples; ++i) { SkIRect cropRect = SkIRect::MakeXYWH(offsets[i][0], offsets[i][1], fBitmap.width() + offsets[i][2], fBitmap.height() + offsets[i][3]); paint.setImageFilter(SkImageFilters::Xfermode(sampledModes[i], offsetBackground, offsetForeground, &cropRect)); DrawClippedPaint(canvas, clipRect, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } } // Test small bg, large fg with Screen (uses shader blend) SkIRect cropRect = SkIRect::MakeXYWH(10, 10, 60, 60); sk_sp cropped(SkImageFilters::Offset(0, 0, foreground, &cropRect)); paint.setImageFilter(SkImageFilters::Xfermode(SkBlendMode::kScreen, cropped, background, nullptr)); DrawClippedPaint(canvas, clipRect, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } // Test small fg, large bg with Screen (uses shader blend) paint.setImageFilter(SkImageFilters::Xfermode(SkBlendMode::kScreen, background, cropped, nullptr)); DrawClippedPaint(canvas, clipRect, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } // Test small fg, large bg with SrcIn with a crop that forces it to full size. // This tests that SkXfermodeImageFilter correctly applies the compositing mode to // the region outside the foreground. SkIRect cropRectFull = SkIRect::MakeXYWH(0, 0, 80, 80); paint.setImageFilter(SkImageFilters::Xfermode(SkBlendMode::kSrcIn, background, cropped, &cropRectFull)); DrawClippedPaint(canvas, clipRect, paint, x, y); x += fBitmap.width() + MARGIN; if (x + fBitmap.width() > WIDTH) { x = 0; y += fBitmap.height() + MARGIN; } } private: static void DrawClippedBitmap(SkCanvas* canvas, const SkBitmap& bitmap, const SkPaint& paint, int x, int y) { canvas->save(); canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); canvas->clipRect(SkRect::MakeIWH(bitmap.width(), bitmap.height())); canvas->drawBitmap(bitmap, 0, 0, &paint); canvas->restore(); } static void DrawClippedPaint(SkCanvas* canvas, const SkRect& rect, const SkPaint& paint, int x, int y) { canvas->save(); canvas->translate(SkIntToScalar(x), SkIntToScalar(y)); canvas->clipRect(rect); canvas->drawPaint(paint); canvas->restore(); } SkBitmap fBitmap; sk_sp fCheckerboard; typedef GM INHERITED; }; ////////////////////////////////////////////////////////////////////////////// DEF_GM( return new XfermodeImageFilterGM; ); }