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
13static 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
38struct LabeledMatrix {
39    SkMatrix    fMatrix;
40    const char* fLabel;
41};
42
43DEF_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