submodule/skia/gm/dropshadowimagefilter.cpp

   1 /*
   2  * Copyright 2013 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "gm/gm.h"
   9 #include "include/core/SkBitmap.h"
  10 #include "include/core/SkBlendMode.h"
  11 #include "include/core/SkCanvas.h"
  12 #include "include/core/SkColor.h"
  13 #include "include/core/SkColorFilter.h"
  14 #include "include/core/SkFont.h"
  15 #include "include/core/SkImageFilter.h"
  16 #include "include/core/SkPaint.h"
  17 #include "include/core/SkRect.h"
  18 #include "include/core/SkRefCnt.h"
  19 #include "include/core/SkScalar.h"
  20 #include "include/core/SkTypeface.h"
  21 #include "include/core/SkTypes.h"
  22 #include "include/effects/SkImageFilters.h"
  23 #include "include/utils/SkTextUtils.h"
  24 #include "tools/ToolUtils.h"
  25
  26 #include <utility>
  27
  28 ///////////////////////////////////////////////////////////////////////////////
  29
  30 static void draw_paint(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
  31     SkPaint paint;
  32     paint.setImageFilter(std::move(imf));
  33     paint.setColor(SK_ColorBLACK);
  34     canvas->save();
  35     canvas->clipRect(r);
  36     canvas->drawPaint(paint);
  37     canvas->restore();
  38 }
  39
  40 static void draw_path(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
  41     SkPaint paint;
  42     paint.setColor(SK_ColorGREEN);
  43     paint.setImageFilter(std::move(imf));
  44     paint.setAntiAlias(true);
  45     canvas->save();
  46     canvas->clipRect(r);
  47     canvas->drawCircle(r.centerX(), r.centerY(), r.width()/3, paint);
  48     canvas->restore();
  49 }
  50
  51 static void draw_text(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
  52     SkPaint paint;
  53     paint.setImageFilter(std::move(imf));
  54     paint.setColor(SK_ColorGREEN);
  55     paint.setAntiAlias(true);
  56
  57     SkFont font(ToolUtils::create_portable_typeface(), r.height() / 2);
  58     canvas->save();
  59     canvas->clipRect(r);
  60     SkTextUtils::DrawString(canvas, "Text", r.centerX(), r.centerY(), font, paint, SkTextUtils::kCenter_Align);
  61     canvas->restore();
  62 }
  63
  64 static void draw_bitmap(SkCanvas* canvas, const SkRect& r, sk_sp<SkImageFilter> imf) {
  65     SkPaint paint;
  66
  67     SkIRect bounds;
  68     r.roundOut(&bounds);
  69
  70     auto surf = SkSurface::MakeRasterN32Premul(bounds.width(), bounds.height());
  71     draw_path(surf->getCanvas(), r, nullptr);
  72
  73     paint.setImageFilter(std::move(imf));
  74     canvas->save();
  75     canvas->clipRect(r);
  76     surf->draw(canvas, 0, 0, SkSamplingOptions(), &paint);
  77     canvas->restore();
  78 }
  79
  80 ///////////////////////////////////////////////////////////////////////////////
  81
  82 DEF_SIMPLE_GM(dropshadowimagefilter, canvas, 400, 656) {
  83     void (*drawProc[])(SkCanvas*, const SkRect&, sk_sp<SkImageFilter>) = {
  84         draw_bitmap, draw_path, draw_paint, draw_text
  85     };
  86
  87     sk_sp<SkColorFilter> cf(SkColorFilters::Blend(SK_ColorMAGENTA, SkBlendMode::kSrcIn));
  88     sk_sp<SkImageFilter> cfif(SkImageFilters::ColorFilter(std::move(cf), nullptr));
  89     SkIRect cropRect = SkIRect::MakeXYWH(10, 10, 44, 44);
  90     SkIRect bogusRect = SkIRect::MakeXYWH(-100, -100, 10, 10);
  91
  92     sk_sp<SkImageFilter> filters[] = {
  93         nullptr,
  94         SkImageFilters::DropShadow(7.0f, 0.0f, 0.0f, 3.0f, SK_ColorBLUE, nullptr),
  95         SkImageFilters::DropShadow(0.0f, 7.0f, 3.0f, 0.0f, SK_ColorBLUE, nullptr),
  96         SkImageFilters::DropShadow(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, nullptr),
  97         SkImageFilters::DropShadow(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, std::move(cfif)),
  98         SkImageFilters::DropShadow(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, nullptr, &cropRect),
  99         SkImageFilters::DropShadow(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, nullptr, &bogusRect),
 100         SkImageFilters::DropShadowOnly(7.0f, 7.0f, 3.0f, 3.0f, SK_ColorBLUE, nullptr),
 101     };
 102
 103     SkRect r = SkRect::MakeWH(SkIntToScalar(64), SkIntToScalar(64));
 104     SkScalar MARGIN = SkIntToScalar(16);
 105     SkScalar DX = r.width() + MARGIN;
 106     SkScalar DY = r.height() + MARGIN;
 107
 108     canvas->translate(MARGIN, MARGIN);
 109     for (size_t j = 0; j < SK_ARRAY_COUNT(drawProc); ++j) {
 110         canvas->save();
 111         for (size_t i = 0; i < SK_ARRAY_COUNT(filters); ++i) {
 112             drawProc[j](canvas, r, filters[i]);
 113             canvas->translate(0, DY);
 114         }
 115         canvas->restore();
 116         canvas->translate(DX, 0);
 117     }
 118 }