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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 "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 }
    186