submodule/skia/gm/filterindiabox.cpp

   1 /*
   2  * Copyright 2011 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/SkCanvas.h"
  11 #include "include/core/SkMatrix.h"
  12 #include "include/core/SkPaint.h"
  13 #include "include/core/SkRect.h"
  14 #include "include/core/SkScalar.h"
  15 #include "include/core/SkSize.h"
  16 #include "include/core/SkString.h"
  17 #include "include/core/SkTypes.h"
  18 #include "tools/Resources.h"
  19 #include "tools/ToolUtils.h"
  20
  21 namespace {
  22 static SkSize computeSize(const SkBitmap& bm, const SkMatrix& mat) {
  23     SkRect bounds = SkRect::MakeWH(SkIntToScalar(bm.width()),
  24                                    SkIntToScalar(bm.height()));
  25     mat.mapRect(&bounds);
  26     return SkSize::Make(bounds.width(), bounds.height());
  27 }
  28
  29 static void draw_cell(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat, SkScalar dx,
  30                       const SkSamplingOptions& sampling) {
  31     SkAutoCanvasRestore acr(canvas, true);
  32
  33     canvas->translate(dx, 0);
  34     canvas->concat(mat);
  35     canvas->drawImage(bm.asImage(), 0, 0, sampling);
  36 }
  37
  38 static void draw_row(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat, SkScalar dx) {
  39     draw_cell(canvas, bm, mat, 0 * dx, SkSamplingOptions());
  40     draw_cell(canvas, bm, mat, 1 * dx, SkSamplingOptions(SkFilterMode::kLinear));
  41     draw_cell(canvas, bm, mat, 2 * dx, SkSamplingOptions(SkFilterMode::kLinear,
  42                                                          SkMipmapMode::kLinear));
  43     draw_cell(canvas, bm, mat, 3 * dx, SkSamplingOptions(SkCubicResampler::Mitchell()));
  44 }
  45
  46 class FilterIndiaBoxGM : public skiagm::GM {
  47     SkBitmap    fBM;
  48     SkMatrix    fMatrix[2];
  49
  50     void onOnceBeforeDraw() override {
  51         constexpr char kResource[] = "images/box.gif";
  52         if (!GetResourceAsBitmap(kResource, &fBM)) {
  53             fBM.allocN32Pixels(1, 1);
  54             fBM.eraseARGB(255, 255, 0 , 0); // red == bad
  55         }
  56         fBM.setImmutable();
  57
  58         SkScalar cx = SkScalarHalf(fBM.width());
  59         SkScalar cy = SkScalarHalf(fBM.height());
  60
  61         float vertScale = 30.0f/55.0f;
  62         float horizScale = 150.0f/200.0f;
  63
  64         fMatrix[0].setScale(horizScale, vertScale);
  65         fMatrix[1].setRotate(30, cx, cy); fMatrix[1].postScale(horizScale, vertScale);
  66     }
  67
  68     SkString onShortName() override { return SkString("filterindiabox"); }
  69
  70     SkISize onISize() override { return {680, 130}; }
  71
  72     void onDraw(SkCanvas* canvas) override {
  73         canvas->translate(10, 10);
  74         for (size_t i = 0; i < SK_ARRAY_COUNT(fMatrix); ++i) {
  75             SkSize size = computeSize(fBM, fMatrix[i]);
  76             size.fWidth += 20;
  77             size.fHeight += 20;
  78
  79             draw_row(canvas, fBM, fMatrix[i], size.fWidth);
  80             canvas->translate(0, size.fHeight);
  81         }
  82     }
  83 };
  84 }  // namespace
  85
  86 DEF_GM( return new FilterIndiaBoxGM(); )