gm/shadertext2.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 #include "gm.h"
   8 #include "SkCanvas.h"
   9 #include "SkGradientShader.h"
  10
  11 namespace skiagm {
  12
  13 static void makebm(SkBitmap* bm, int w, int h) {
  14     bm->allocN32Pixels(w, h);
  15     bm->eraseColor(SK_ColorTRANSPARENT);
  16
  17     SkCanvas    canvas(*bm);
  18     SkScalar    s = SkIntToScalar(SkMin32(w, h));
  19     static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
  20     static const SkPoint     kPts1[] = { { s, 0 }, { 0, s } };
  21     static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
  22     static const SkColor kColors0[] = {0x40FF00FF, 0xF0FFFF00, 0x4000FFFF };
  23     static const SkColor kColors1[] = {0xF0FF00FF, 0x80FFFF00, 0xF000FFFF };
  24
  25
  26     SkPaint     paint;
  27
  28     paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
  29                     SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode))->unref();
  30     canvas.drawPaint(paint);
  31     paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
  32                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
  33     canvas.drawPaint(paint);
  34 }
  35
  36 ///////////////////////////////////////////////////////////////////////////////
  37
  38 struct LabeledMatrix {
  39     SkMatrix    fMatrix;
  40     const char* fLabel;
  41 };
  42
  43 class ShaderText2GM : public GM {
  44 public:
  45     ShaderText2GM() {
  46         this->setBGColor(0xFFDDDDDD);
  47     }
  48
  49 protected:
  50
  51     SkString onShortName() SK_OVERRIDE {
  52         return SkString("shadertext2");
  53     }
  54
  55     SkISize onISize() SK_OVERRIDE { return SkISize::Make(1800, 900); }
  56
  57     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
  58         static const char kText[] = "SKIA";
  59         static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
  60         static const int kPointSize = 55;
  61
  62         SkTDArray<LabeledMatrix> matrices;
  63         matrices.append()->fMatrix.reset();
  64         matrices.top().fLabel = "Identity";
  65         matrices.append()->fMatrix.setScale(1.2f, 0.8f);
  66         matrices.top().fLabel = "Scale";
  67         matrices.append()->fMatrix.setRotate(10.f);
  68         matrices.top().fLabel = "Rotate";
  69         matrices.append()->fMatrix.reset();
  70         matrices.top().fMatrix.setPerspX(-0.0015f);
  71         matrices.top().fMatrix.setPerspY(+0.0015f);
  72         matrices.top().fLabel = "Persp";
  73
  74         SkTDArray<LabeledMatrix> localMatrices;
  75         localMatrices.append()->fMatrix.reset();
  76         localMatrices.top().fLabel = "Identity";
  77         localMatrices.append()->fMatrix.setScale(2.5f, 0.2f);
  78         localMatrices.top().fLabel = "Scale";
  79         localMatrices.append()->fMatrix.setRotate(45.f);
  80         localMatrices.top().fLabel = "Rotate";
  81         localMatrices.append()->fMatrix.reset();
  82         localMatrices.top().fMatrix.setPerspX(-0.007f);
  83         localMatrices.top().fMatrix.setPerspY(+0.008f);
  84         localMatrices.top().fLabel = "Persp";
  85
  86         static SkBitmap bmp;
  87         if (bmp.isNull()) {
  88             makebm(&bmp, kPointSize / 2, kPointSize / 2);
  89         }
  90
  91         SkPaint fillPaint;
  92         fillPaint.setAntiAlias(true);
  93         sk_tool_utils::set_portable_typeface(&fillPaint);
  94         fillPaint.setTextSize(SkIntToScalar(kPointSize));
  95         fillPaint.setFilterQuality(kLow_SkFilterQuality);
  96
  97         SkPaint outlinePaint;
  98         outlinePaint.setAntiAlias(true);
  99         sk_tool_utils::set_portable_typeface(&outlinePaint);
 100         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
 101         outlinePaint.setStyle(SkPaint::kStroke_Style);
 102         outlinePaint.setStrokeWidth(0.f);
 103
 104         SkScalar w = fillPaint.measureText(kText, kTextLen);
 105         static SkScalar kPadY = 0.5f * kPointSize;
 106         static SkScalar kPadX = 1.5f * kPointSize;
 107
 108         SkPaint strokePaint(fillPaint);
 109         strokePaint.setStyle(SkPaint::kStroke_Style);
 110         strokePaint.setStrokeWidth(kPointSize * 0.1f);
 111
 112         SkPaint labelPaint;
 113         labelPaint.setColor(0xff000000);
 114         labelPaint.setAntiAlias(true);
 115         sk_tool_utils::set_portable_typeface(&labelPaint);
 116         labelPaint.setTextSize(12.f);
 117
 118         canvas->translate(15.f, 15.f);
 119         canvas->drawBitmap(bmp, 0, 0);
 120         canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);
 121
 122         static const char kLabelLabel[] = "localM / canvasM";
 123         canvas->drawText(kLabelLabel, strlen(kLabelLabel), 0, 0, labelPaint);
 124         canvas->translate(0, 15.f);
 125
 126         canvas->save();
 127         SkScalar maxLabelW = 0;
 128         canvas->translate(0, kPadY / 2 + kPointSize);
 129         for (int lm = 0; lm < localMatrices.count(); ++lm) {
 130             canvas->drawText(matrices[lm].fLabel, strlen(matrices[lm].fLabel),
 131                              0, labelPaint.getTextSize() - 1, labelPaint);
 132             SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
 133                                                      strlen(matrices[lm].fLabel));
 134             maxLabelW = SkMaxScalar(maxLabelW, labelW);
 135             canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
 136         }
 137         canvas->restore();
 138
 139         canvas->translate(maxLabelW + kPadX / 2.f, 0.f);
 140
 141         for (int s = 0; s < 2; ++s) {
 142             SkPaint& paint = s ? strokePaint : fillPaint;
 143
 144             SkScalar columnH = 0;
 145             for (int m = 0; m < matrices.count(); ++m) {
 146                 columnH = 0;
 147                 canvas->save();
 148                 canvas->drawText(matrices[m].fLabel, strlen(matrices[m].fLabel),
 149                                  0, labelPaint.getTextSize() - 1, labelPaint);
 150                 canvas->translate(0, kPadY / 2 + kPointSize);
 151                 columnH += kPadY / 2 + kPointSize;
 152                 for (int lm = 0; lm < localMatrices.count(); ++lm) {
 153                     paint.setShader(
 154                             SkShader::CreateBitmapShader(bmp,
 155                                                          SkShader::kMirror_TileMode,
 156                                                          SkShader::kRepeat_TileMode,
 157                                                          &localMatrices[lm].fMatrix))->unref();
 158
 159                     canvas->save();
 160                         canvas->concat(matrices[m].fMatrix);
 161                         canvas->drawText(kText, kTextLen, 0, 0, paint);
 162                         canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
 163                     canvas->restore();
 164
 165                     SkPath path;
 166                     path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
 167                                                 1.2f * w, 2.f * kPointSize),
 168                                                 225.f, 359.f,
 169                                                 false);
 170                     path.close();
 171
 172                     canvas->translate(0.f, kPointSize + kPadY);
 173                     columnH += kPointSize + kPadY;
 174
 175                     canvas->save();
 176                         canvas->concat(matrices[m].fMatrix);
 177                         canvas->drawTextOnPath(kText, kTextLen, path, NULL, paint);
 178                         canvas->drawTextOnPath(kText, kTextLen, path, NULL, outlinePaint);
 179                     canvas->restore();
 180                     SkPaint stroke;
 181                     stroke.setStyle(SkPaint::kStroke_Style);
 182                     canvas->translate(0.f, kPointSize + kPadY);
 183                     columnH += kPointSize + kPadY;
 184                 }
 185                 canvas->restore();
 186                 canvas->translate(w + kPadX, 0.f);
 187             }
 188             if (0 == s) {
 189                 canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
 190                 canvas->translate(kPadX / 2, 0.f);
 191                 static const char kFillLabel[] = "Filled";
 192                 static const char kStrokeLabel[] = "Stroked";
 193                 SkScalar y = columnH + kPadY / 2;
 194                 SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
 195                 SkScalar strokeX = kPadX;
 196                 canvas->drawText(kFillLabel, strlen(kFillLabel), fillX, y, labelPaint);
 197                 canvas->drawText(kStrokeLabel, strlen(kStrokeLabel), strokeX, y, labelPaint);
 198             }
 199         }
 200     }
 201
 202 private:
 203     typedef GM INHERITED;
 204 };
 205
 206 ///////////////////////////////////////////////////////////////////////////////
 207
 208 static GM* MyFactory(void*) { return new ShaderText2GM; }
 209 static GMRegistry reg(MyFactory);
 210 }