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      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() {
     52         return SkString("shadertext2");
     53     }
     54 
     55     SkISize onISize() { return SkISize::Make(1800, 900); }
     56 
     57     virtual void onDraw(SkCanvas* canvas) {
     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         fillPaint.setTextSize(SkIntToScalar(kPointSize));
     94         fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
     95 
     96         SkPaint outlinePaint;
     97         outlinePaint.setAntiAlias(true);
     98         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
     99         outlinePaint.setStyle(SkPaint::kStroke_Style);
    100         outlinePaint.setStrokeWidth(0.f);
    101 
    102         SkScalar w = fillPaint.measureText(kText, kTextLen);
    103         static SkScalar kPadY = 0.5f * kPointSize;
    104         static SkScalar kPadX = 1.5f * kPointSize;
    105 
    106         SkPaint strokePaint(fillPaint);
    107         strokePaint.setStyle(SkPaint::kStroke_Style);
    108         strokePaint.setStrokeWidth(kPointSize * 0.1f);
    109 
    110         SkPaint labelPaint;
    111         labelPaint.setColor(0xff000000);
    112         labelPaint.setAntiAlias(true);
    113         labelPaint.setTextSize(12.f);
    114 
    115         canvas->translate(15.f, 15.f);
    116         canvas->drawBitmap(bmp, 0, 0);
    117         canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);
    118 
    119         static const char kLabelLabel[] = "localM / canvasM";
    120         canvas->drawText(kLabelLabel, strlen(kLabelLabel), 0, 0, labelPaint);
    121         canvas->translate(0, 15.f);
    122 
    123         canvas->save();
    124         SkScalar maxLabelW = 0;
    125         canvas->translate(0, kPadY / 2 + kPointSize);
    126         for (int lm = 0; lm < localMatrices.count(); ++lm) {
    127             canvas->drawText(matrices[lm].fLabel, strlen(matrices[lm].fLabel),
    128                              0, labelPaint.getTextSize() - 1, labelPaint);
    129             SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
    130                                                      strlen(matrices[lm].fLabel));
    131             maxLabelW = SkMaxScalar(maxLabelW, labelW);
    132             canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
    133         }
    134         canvas->restore();
    135 
    136         canvas->translate(maxLabelW + kPadX / 2.f, 0.f);
    137 
    138         for (int s = 0; s < 2; ++s) {
    139             SkPaint& paint = s ? strokePaint : fillPaint;
    140 
    141             SkScalar columnH = 0;
    142             for (int m = 0; m < matrices.count(); ++m) {
    143                 columnH = 0;
    144                 canvas->save();
    145                 canvas->drawText(matrices[m].fLabel, strlen(matrices[m].fLabel),
    146                                  0, labelPaint.getTextSize() - 1, labelPaint);
    147                 canvas->translate(0, kPadY / 2 + kPointSize);
    148                 columnH += kPadY / 2 + kPointSize;
    149                 for (int lm = 0; lm < localMatrices.count(); ++lm) {
    150                     paint.setShader(
    151                             SkShader::CreateBitmapShader(bmp,
    152                                                          SkShader::kMirror_TileMode,
    153                                                          SkShader::kRepeat_TileMode,
    154                                                          &localMatrices[lm].fMatrix))->unref();
    155 
    156                     canvas->save();
    157                         canvas->concat(matrices[m].fMatrix);
    158                         canvas->drawText(kText, kTextLen, 0, 0, paint);
    159                         canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
    160                     canvas->restore();
    161 
    162                     SkPath path;
    163                     path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
    164                                                 1.2f * w, 2.f * kPointSize),
    165                                                 225.f, 359.f,
    166                                                 false);
    167                     path.close();
    168 
    169                     canvas->translate(0.f, kPointSize + kPadY);
    170                     columnH += kPointSize + kPadY;
    171 
    172                     canvas->save();
    173                         canvas->concat(matrices[m].fMatrix);
    174                         canvas->drawTextOnPath(kText, kTextLen, path, NULL, paint);
    175                         canvas->drawTextOnPath(kText, kTextLen, path, NULL, outlinePaint);
    176                     canvas->restore();
    177                     SkPaint stroke;
    178                     stroke.setStyle(SkPaint::kStroke_Style);
    179                     canvas->translate(0.f, kPointSize + kPadY);
    180                     columnH += kPointSize + kPadY;
    181                 }
    182                 canvas->restore();
    183                 canvas->translate(w + kPadX, 0.f);
    184             }
    185             if (0 == s) {
    186                 canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
    187                 canvas->translate(kPadX / 2, 0.f);
    188                 static const char kFillLabel[] = "Filled";
    189                 static const char kStrokeLabel[] = "Stroked";
    190                 SkScalar y = columnH + kPadY / 2;
    191                 SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
    192                 SkScalar strokeX = kPadX;
    193                 canvas->drawText(kFillLabel, strlen(kFillLabel), fillX, y, labelPaint);
    194                 canvas->drawText(kStrokeLabel, strlen(kStrokeLabel), strokeX, y, labelPaint);
    195             }
    196         }
    197     }
    198 
    199     virtual uint32_t onGetFlags() const SK_OVERRIDE {
    200         // disable 565 for now, til mike fixes the debug assert
    201         return kSkip565_Flag | kSkipTiled_Flag;
    202     }
    203 
    204 private:
    205     typedef GM INHERITED;
    206 };
    207 
    208 ///////////////////////////////////////////////////////////////////////////////
    209 
    210 static GM* MyFactory(void*) { return new ShaderText2GM; }
    211 static GMRegistry reg(MyFactory);
    212 }
    213