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 "sk_tool_utils.h"
   9 #include "SkCanvas.h"
  10 #include "SkGradientShader.h"
  11 #include "SkPath.h"
  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     const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
  20     const SkPoint     kPts1[] = { { s, 0 }, { 0, s } };
  21     const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
  22     const SkColor kColors0[] = {0x40FF00FF, 0xF0FFFF00, 0x4000FFFF };
  23     const SkColor kColors1[] = {0xF0FF00FF, 0x80FFFF00, 0xF000FFFF };
  24
  25
  26     SkPaint     paint;
  27
  28     paint.setShader(SkGradientShader::MakeLinear(kPts0, kColors0, kPos,
  29                     SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode));
  30     canvas.drawPaint(paint);
  31     paint.setShader(SkGradientShader::MakeLinear(kPts1, kColors1, kPos,
  32                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode));
  33     canvas.drawPaint(paint);
  34 }
  35
  36 ///////////////////////////////////////////////////////////////////////////////
  37
  38 struct LabeledMatrix {
  39     SkMatrix    fMatrix;
  40     const char* fLabel;
  41 };
  42
  43 DEF_SIMPLE_GM_BG(shadertext2, canvas, 1800, 900,
  44                  sk_tool_utils::color_to_565(0xFFDDDDDD)) {
  45         constexpr char kText[] = "SKIA";
  46         constexpr int kTextLen = SK_ARRAY_COUNT(kText) - 1;
  47         constexpr int kPointSize = 55;
  48
  49         SkTDArray<LabeledMatrix> matrices;
  50         matrices.append()->fMatrix.reset();
  51         matrices.top().fLabel = "Identity";
  52         matrices.append()->fMatrix.setScale(1.2f, 0.8f);
  53         matrices.top().fLabel = "Scale";
  54         matrices.append()->fMatrix.setRotate(10.f);
  55         matrices.top().fLabel = "Rotate";
  56         matrices.append()->fMatrix.reset();
  57         matrices.top().fMatrix.setPerspX(-0.0015f);
  58         matrices.top().fMatrix.setPerspY(+0.0015f);
  59         matrices.top().fLabel = "Persp";
  60
  61         SkTDArray<LabeledMatrix> localMatrices;
  62         localMatrices.append()->fMatrix.reset();
  63         localMatrices.top().fLabel = "Identity";
  64         localMatrices.append()->fMatrix.setScale(2.5f, 0.2f);
  65         localMatrices.top().fLabel = "Scale";
  66         localMatrices.append()->fMatrix.setRotate(45.f);
  67         localMatrices.top().fLabel = "Rotate";
  68         localMatrices.append()->fMatrix.reset();
  69         localMatrices.top().fMatrix.setPerspX(-0.007f);
  70         localMatrices.top().fMatrix.setPerspY(+0.008f);
  71         localMatrices.top().fLabel = "Persp";
  72
  73         static SkBitmap bmp;
  74         if (bmp.isNull()) {
  75             makebm(&bmp, kPointSize / 2, kPointSize / 2);
  76         }
  77
  78         SkPaint fillPaint;
  79         fillPaint.setAntiAlias(true);
  80         sk_tool_utils::set_portable_typeface(&fillPaint);
  81         fillPaint.setTextSize(SkIntToScalar(kPointSize));
  82         fillPaint.setFilterQuality(kLow_SkFilterQuality);
  83
  84         SkPaint outlinePaint;
  85         outlinePaint.setAntiAlias(true);
  86         sk_tool_utils::set_portable_typeface(&outlinePaint);
  87         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
  88         outlinePaint.setStyle(SkPaint::kStroke_Style);
  89         outlinePaint.setStrokeWidth(0.f);
  90
  91         SkScalar w = fillPaint.measureText(kText, kTextLen);
  92         static SkScalar kPadY = 0.5f * kPointSize;
  93         static SkScalar kPadX = 1.5f * kPointSize;
  94
  95         SkPaint strokePaint(fillPaint);
  96         strokePaint.setStyle(SkPaint::kStroke_Style);
  97         strokePaint.setStrokeWidth(kPointSize * 0.1f);
  98
  99         SkPaint labelPaint;
 100         labelPaint.setColor(0xff000000);
 101         labelPaint.setAntiAlias(true);
 102         sk_tool_utils::set_portable_typeface(&labelPaint);
 103         labelPaint.setTextSize(12.f);
 104
 105         canvas->translate(15.f, 15.f);
 106         canvas->drawBitmap(bmp, 0, 0);
 107         canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);
 108
 109         constexpr char kLabelLabel[] = "localM / canvasM";
 110         canvas->drawString(kLabelLabel, 0, 0, labelPaint);
 111         canvas->translate(0, 15.f);
 112
 113         canvas->save();
 114         SkScalar maxLabelW = 0;
 115         canvas->translate(0, kPadY / 2 + kPointSize);
 116         for (int lm = 0; lm < localMatrices.count(); ++lm) {
 117             canvas->drawString(matrices[lm].fLabel,
 118                              0, labelPaint.getTextSize() - 1, labelPaint);
 119             SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
 120                                                      strlen(matrices[lm].fLabel));
 121             maxLabelW = SkMaxScalar(maxLabelW, labelW);
 122             canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
 123         }
 124         canvas->restore();
 125
 126         canvas->translate(maxLabelW + kPadX / 2.f, 0.f);
 127
 128         for (int s = 0; s < 2; ++s) {
 129             SkPaint& paint = s ? strokePaint : fillPaint;
 130
 131             SkScalar columnH = 0;
 132             for (int m = 0; m < matrices.count(); ++m) {
 133                 columnH = 0;
 134                 canvas->save();
 135                 canvas->drawString(matrices[m].fLabel,
 136                                  0, labelPaint.getTextSize() - 1, labelPaint);
 137                 canvas->translate(0, kPadY / 2 + kPointSize);
 138                 columnH += kPadY / 2 + kPointSize;
 139                 for (int lm = 0; lm < localMatrices.count(); ++lm) {
 140                     paint.setShader(SkShader::MakeBitmapShader(bmp, SkShader::kMirror_TileMode,
 141                                                                SkShader::kRepeat_TileMode,
 142                                                                &localMatrices[lm].fMatrix));
 143
 144                     canvas->save();
 145                         canvas->concat(matrices[m].fMatrix);
 146                         canvas->drawText(kText, kTextLen, 0, 0, paint);
 147                         canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
 148                     canvas->restore();
 149
 150                     SkPath path;
 151                     path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
 152                                                 1.2f * w, 2.f * kPointSize),
 153                                                 225.f, 359.f,
 154                                                 false);
 155                     path.close();
 156
 157                     canvas->translate(0.f, kPointSize + kPadY);
 158                     columnH += kPointSize + kPadY;
 159
 160                     canvas->save();
 161                         canvas->concat(matrices[m].fMatrix);
 162                         canvas->drawTextOnPath(kText, kTextLen, path, nullptr, paint);
 163                         canvas->drawTextOnPath(kText, kTextLen, path, nullptr, outlinePaint);
 164                     canvas->restore();
 165                     SkPaint stroke;
 166                     stroke.setStyle(SkPaint::kStroke_Style);
 167                     canvas->translate(0.f, kPointSize + kPadY);
 168                     columnH += kPointSize + kPadY;
 169                 }
 170                 canvas->restore();
 171                 canvas->translate(w + kPadX, 0.f);
 172             }
 173             if (0 == s) {
 174                 canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
 175                 canvas->translate(kPadX / 2, 0.f);
 176                 constexpr char kFillLabel[] = "Filled";
 177                 constexpr char kStrokeLabel[] = "Stroked";
 178                 SkScalar y = columnH + kPadY / 2;
 179                 SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
 180                 SkScalar strokeX = kPadX;
 181                 canvas->drawString(kFillLabel, fillX, y, labelPaint);
 182                 canvas->drawString(kStrokeLabel, strokeX, y, labelPaint);
 183             }
 184         }
 185 }