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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 #include "SkUnitMappers.h"
     11 
     12 namespace skiagm {
     13 
     14 static void makebm(SkBitmap* bm, SkBitmap::Config config, int w, int h) {
     15     bm->setConfig(config, w, h);
     16     bm->allocPixels();
     17     bm->eraseColor(SK_ColorTRANSPARENT);
     18 
     19     SkCanvas    canvas(*bm);
     20     SkScalar    s = SkIntToScalar(SkMin32(w, h));
     21     static const SkPoint     kPts0[] = { { 0, 0 }, { s, s } };
     22     static const SkPoint     kPts1[] = { { s, 0 }, { 0, s } };
     23     static const SkScalar    kPos[] = { 0, SK_Scalar1/2, SK_Scalar1 };
     24     static const SkColor kColors0[] = {0x40FF00FF, 0xF0FFFF00, 0x4000FFFF };
     25     static const SkColor kColors1[] = {0xF0FF00FF, 0x80FFFF00, 0xF000FFFF };
     26 
     27 
     28     SkPaint     paint;
     29 
     30     SkUnitMapper*   um = NULL;
     31 
     32     um = new SkCosineMapper;
     33 
     34     SkAutoUnref au(um);
     35 
     36     paint.setShader(SkGradientShader::CreateLinear(kPts0, kColors0, kPos,
     37                     SK_ARRAY_COUNT(kColors0), SkShader::kClamp_TileMode, um))->unref();
     38     canvas.drawPaint(paint);
     39     paint.setShader(SkGradientShader::CreateLinear(kPts1, kColors1, kPos,
     40                     SK_ARRAY_COUNT(kColors1), SkShader::kClamp_TileMode))->unref();
     41     canvas.drawPaint(paint);
     42 }
     43 
     44 ///////////////////////////////////////////////////////////////////////////////
     45 
     46 struct LabeledMatrix {
     47     SkMatrix    fMatrix;
     48     const char* fLabel;
     49 };
     50 
     51 class ShaderText2GM : public GM {
     52 public:
     53     ShaderText2GM() {
     54         this->setBGColor(0xFFDDDDDD);
     55     }
     56 
     57 protected:
     58 
     59     SkString onShortName() {
     60         return SkString("shadertext2");
     61     }
     62 
     63     SkISize onISize() { return make_isize(1800, 900); }
     64 
     65     virtual void onDraw(SkCanvas* canvas) {
     66         static const char kText[] = "SKIA";
     67         static const int kTextLen = SK_ARRAY_COUNT(kText) - 1;
     68         static const int kPointSize = 55;
     69 
     70         SkTDArray<LabeledMatrix> matrices;
     71         matrices.append()->fMatrix.reset();
     72         matrices.top().fLabel = "Identity";
     73         matrices.append()->fMatrix.setScale(1.2f, 0.8f);
     74         matrices.top().fLabel = "Scale";
     75         matrices.append()->fMatrix.setRotate(10.f);
     76         matrices.top().fLabel = "Rotate";
     77         matrices.append()->fMatrix.reset();
     78         matrices.top().fMatrix.setPerspX(-0.0015f);
     79         matrices.top().fMatrix.setPerspY(+0.0015f);
     80         matrices.top().fLabel = "Persp";
     81 
     82         SkTDArray<LabeledMatrix> localMatrices;
     83         localMatrices.append()->fMatrix.reset();
     84         localMatrices.top().fLabel = "Identity";
     85         localMatrices.append()->fMatrix.setScale(2.5f, 0.2f);
     86         localMatrices.top().fLabel = "Scale";
     87         localMatrices.append()->fMatrix.setRotate(45.f);
     88         localMatrices.top().fLabel = "Rotate";
     89         localMatrices.append()->fMatrix.reset();
     90         localMatrices.top().fMatrix.setPerspX(-0.007f);
     91         localMatrices.top().fMatrix.setPerspY(+0.008f);
     92         localMatrices.top().fLabel = "Persp";
     93 
     94         static SkBitmap bmp;
     95         if (bmp.isNull()) {
     96             makebm(&bmp, SkBitmap::kARGB_8888_Config, kPointSize / 2, kPointSize / 2);
     97         }
     98 
     99         SkAutoTUnref<SkShader> shader(SkShader::CreateBitmapShader(bmp,
    100                                                                    SkShader::kMirror_TileMode,
    101                                                                    SkShader::kRepeat_TileMode));
    102         SkPaint fillPaint;
    103         fillPaint.setAntiAlias(true);
    104         fillPaint.setTextSize(SkIntToScalar(kPointSize));
    105         fillPaint.setFilterLevel(SkPaint::kLow_FilterLevel);
    106         fillPaint.setShader(shader);
    107 
    108         SkPaint outlinePaint;
    109         outlinePaint.setAntiAlias(true);
    110         outlinePaint.setTextSize(SkIntToScalar(kPointSize));
    111         outlinePaint.setStyle(SkPaint::kStroke_Style);
    112         outlinePaint.setStrokeWidth(0.f);
    113 
    114         SkScalar w = fillPaint.measureText(kText, kTextLen);
    115         static SkScalar kPadY = 0.5f * kPointSize;
    116         static SkScalar kPadX = 1.5f * kPointSize;
    117 
    118         SkPaint strokePaint(fillPaint);
    119         strokePaint.setStyle(SkPaint::kStroke_Style);
    120         strokePaint.setStrokeWidth(kPointSize * 0.1f);
    121 
    122         SkPaint labelPaint;
    123         labelPaint.setColor(0xff000000);
    124         labelPaint.setAntiAlias(true);
    125         labelPaint.setTextSize(12.f);
    126 
    127         canvas->translate(15.f, 15.f);
    128         canvas->drawBitmap(bmp, 0, 0);
    129         canvas->translate(0, bmp.height() + labelPaint.getTextSize() + 15.f);
    130 
    131         static const char kLabelLabel[] = "localM / canvasM";
    132         canvas->drawText(kLabelLabel, strlen(kLabelLabel), 0, 0, labelPaint);
    133         canvas->translate(0, 15.f);
    134 
    135         canvas->save();
    136         SkScalar maxLabelW = 0;
    137         canvas->translate(0, kPadY / 2 + kPointSize);
    138         for (int lm = 0; lm < localMatrices.count(); ++lm) {
    139             canvas->drawText(matrices[lm].fLabel, strlen(matrices[lm].fLabel),
    140                              0, labelPaint.getTextSize() - 1, labelPaint);
    141             SkScalar labelW = labelPaint.measureText(matrices[lm].fLabel,
    142                                                      strlen(matrices[lm].fLabel));
    143             maxLabelW = SkMaxScalar(maxLabelW, labelW);
    144             canvas->translate(0.f, 2 * kPointSize + 2.5f * kPadY);
    145         }
    146         canvas->restore();
    147 
    148         canvas->translate(maxLabelW + kPadX / 2.f, 0.f);
    149 
    150         for (int s = 0; s < 2; ++s) {
    151             SkPaint& paint = s ? strokePaint : fillPaint;
    152 
    153             SkScalar columnH;
    154             for (int m = 0; m < matrices.count(); ++m) {
    155                 columnH = 0;
    156                 canvas->save();
    157                 canvas->drawText(matrices[m].fLabel, strlen(matrices[m].fLabel),
    158                                  0, labelPaint.getTextSize() - 1, labelPaint);
    159                 canvas->translate(0, kPadY / 2 + kPointSize);
    160                 columnH += kPadY / 2 + kPointSize;
    161                 for (int lm = 0; lm < localMatrices.count(); ++lm) {
    162                     shader->setLocalMatrix(localMatrices[lm].fMatrix);
    163 
    164                     canvas->save();
    165                         canvas->concat(matrices[m].fMatrix);
    166                         canvas->drawText(kText, kTextLen, 0, 0, paint);
    167                         canvas->drawText(kText, kTextLen, 0, 0, outlinePaint);
    168                     canvas->restore();
    169 
    170                     SkPath path;
    171                     path.arcTo(SkRect::MakeXYWH(-0.1f * w, 0.f,
    172                                                 1.2f * w, 2.f * kPointSize),
    173                                                 225.f, 359.f,
    174                                                 false);
    175                     path.close();
    176 
    177                     canvas->translate(0.f, kPointSize + kPadY);
    178                     columnH += kPointSize + kPadY;
    179 
    180                     canvas->save();
    181                         canvas->concat(matrices[m].fMatrix);
    182                         canvas->drawTextOnPath(kText, kTextLen, path, NULL, paint);
    183                         canvas->drawTextOnPath(kText, kTextLen, path, NULL, outlinePaint);
    184                     canvas->restore();
    185                     SkPaint stroke;
    186                     stroke.setStyle(SkPaint::kStroke_Style);
    187                     canvas->translate(0.f, kPointSize + kPadY);
    188                     columnH += kPointSize + kPadY;
    189                 }
    190                 canvas->restore();
    191                 canvas->translate(w + kPadX, 0.f);
    192             }
    193             if (0 == s) {
    194                 canvas->drawLine(0.f, -kPadY, 0.f, columnH + kPadY, outlinePaint);
    195                 canvas->translate(kPadX / 2, 0.f);
    196                 static const char kFillLabel[] = "Filled";
    197                 static const char kStrokeLabel[] = "Stroked";
    198                 SkScalar y = columnH + kPadY / 2;
    199                 SkScalar fillX = -outlinePaint.measureText(kFillLabel, strlen(kFillLabel)) - kPadX;
    200                 SkScalar strokeX = kPadX;
    201                 canvas->drawText(kFillLabel, strlen(kFillLabel), fillX, y, labelPaint);
    202                 canvas->drawText(kStrokeLabel, strlen(kStrokeLabel), strokeX, y, labelPaint);
    203             }
    204         }
    205     }
    206 
    207     virtual uint32_t onGetFlags() const SK_OVERRIDE {
    208         // disable 565 for now, til mike fixes the debug assert
    209         return this->INHERITED::onGetFlags() | kSkip565_Flag;
    210     }
    211 
    212 private:
    213     typedef GM INHERITED;
    214 };
    215 
    216 ///////////////////////////////////////////////////////////////////////////////
    217 
    218 #ifndef SK_BUILD_FOR_ANDROID
    219 static GM* MyFactory(void*) { return new ShaderText2GM; }
    220 static GMRegistry reg(MyFactory);
    221 #endif
    222 }
    223