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.h"
   9 #include "sk_tool_utils.h"
  10
  11 #include "Resources.h"
  12 #include "SkBitmapProcState.h"
  13 #include "SkBitmapScaler.h"
  14 #include "SkGradientShader.h"
  15 #include "SkImageEncoder.h"
  16 #include "SkStream.h"
  17 #include "SkTypeface.h"
  18
  19 static SkSize computeSize(const SkBitmap& bm, const SkMatrix& mat) {
  20     SkRect bounds = SkRect::MakeWH(SkIntToScalar(bm.width()),
  21                                    SkIntToScalar(bm.height()));
  22     mat.mapRect(&bounds);
  23     return SkSize::Make(bounds.width(), bounds.height());
  24 }
  25
  26 static void draw_cell(SkCanvas* canvas, const SkBitmap& bm, const SkMatrix& mat, SkScalar dx,
  27                       SkFilterQuality lvl) {
  28     SkPaint paint;
  29     paint.setFilterQuality(lvl);
  30
  31     SkAutoCanvasRestore acr(canvas, true);
  32
  33     canvas->translate(dx, 0);
  34     canvas->concat(mat);
  35     canvas->drawBitmap(bm, 0, 0, &paint);
  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, kNone_SkFilterQuality);
  40     draw_cell(canvas, bm, mat, 1 * dx, kLow_SkFilterQuality);
  41     draw_cell(canvas, bm, mat, 2 * dx, kMedium_SkFilterQuality);
  42     draw_cell(canvas, bm, mat, 3 * dx, kHigh_SkFilterQuality);
  43 }
  44
  45 class FilterIndiaBoxGM : public skiagm::GM {
  46     void onOnceBeforeDraw() override {
  47         this->makeBitmap();
  48
  49         SkScalar cx = SkScalarHalf(fBM.width());
  50         SkScalar cy = SkScalarHalf(fBM.height());
  51
  52         float vertScale = 30.0f/55.0f;
  53         float horizScale = 150.0f/200.0f;
  54
  55         fMatrix[0].setScale(horizScale, vertScale);
  56         fMatrix[1].setRotate(30, cx, cy); fMatrix[1].postScale(horizScale, vertScale);
  57     }
  58
  59 public:
  60     SkBitmap    fBM;
  61     SkMatrix    fMatrix[2];
  62     SkString    fName;
  63
  64     FilterIndiaBoxGM() {
  65         this->setBGColor(sk_tool_utils::color_to_565(0xFFDDDDDD));
  66     }
  67
  68     FilterIndiaBoxGM(const char filename[]) : fFilename(filename) {
  69         fName.printf("filterindiabox");
  70     }
  71
  72 protected:
  73     SkString onShortName() override {
  74         return fName;
  75     }
  76
  77     SkISize onISize() override {
  78         return SkISize::Make(1024, 768);
  79     }
  80
  81     void onDraw(SkCanvas* canvas) override {
  82         canvas->translate(10, 10);
  83         for (size_t i = 0; i < SK_ARRAY_COUNT(fMatrix); ++i) {
  84             SkSize size = computeSize(fBM, fMatrix[i]);
  85             size.fWidth += 20;
  86             size.fHeight += 20;
  87
  88             draw_row(canvas, fBM, fMatrix[i], size.fWidth);
  89             canvas->translate(0, size.fHeight);
  90         }
  91     }
  92
  93   protected:
  94       SkString fFilename;
  95       int fSize;
  96
  97       SkScalar getScale() {
  98           return 192.f/fSize;
  99       }
 100
 101       void makeBitmap() {
 102         if (!GetResourceAsBitmap(fFilename.c_str(), &fBM)) {
 103             fBM.allocN32Pixels(1, 1);
 104             fBM.eraseARGB(255, 255, 0 , 0); // red == bad
 105         }
 106         fSize = fBM.height();
 107       }
 108   private:
 109     typedef skiagm::GM INHERITED;
 110 };
 111
 112 //////////////////////////////////////////////////////////////////////////////
 113
 114
 115 DEF_GM( return new FilterIndiaBoxGM("box.gif"); )