aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/utils/SkGatherPixelRefsAndRects.h
blob: 6e11fbe6d58a350f1c8008187a4114f0d3e96d6e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkGatherPixelRefsAndRects_DEFINED
#define SkGatherPixelRefsAndRects_DEFINED

#include "SkBitmap.h"
#include "SkDevice.h"
#include "SkDraw.h"
#include "SkPictureUtils.h"
#include "SkRasterClip.h"
#include "SkRefCnt.h"
#include "SkRRect.h"
#include "SkTypes.h"

// This GatherPixelRefs device passes all discovered pixel refs and their
// device bounds to the user provided SkPixelRefContainer-derived object
class SkGatherPixelRefsAndRectsDevice : public SkBaseDevice {
public:
    SK_DECLARE_INST_COUNT(SkGatherPixelRefsAndRectsDevice)

    SkGatherPixelRefsAndRectsDevice(int width, int height,
                                    SkPictureUtils::SkPixelRefContainer* prCont) {
        fSize.set(width, height);
        fPRCont = prCont;
        SkSafeRef(fPRCont);
        fEmptyBitmap.setInfo(SkImageInfo::MakeUnknown(width, height));
    }

    virtual ~SkGatherPixelRefsAndRectsDevice() {
        SkSafeUnref(fPRCont);
    }

    virtual SkImageInfo imageInfo() const SK_OVERRIDE {
        return fEmptyBitmap.info();
    }

protected:
    virtual void drawPaint(const SkDraw& draw, const SkPaint& paint) SK_OVERRIDE {
        SkBitmap bm;

        if (GetBitmapFromPaint(paint, &bm)) {
            SkRect clipRect = SkRect::Make(draw.fRC->getBounds());
            fPRCont->add(bm.pixelRef(), clipRect);
        }
    }
    virtual void drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
                            const SkPoint points[], const SkPaint& paint) SK_OVERRIDE {
        SkBitmap bm;
        if (!GetBitmapFromPaint(paint, &bm)) {
            return;
        }

        if (0 == count) {
            return;
        }

        SkPoint min = points[0];
        SkPoint max = points[0];
        for (size_t i = 1; i < count; ++i) {
            const SkPoint& point = points[i];

            min.set(SkMinScalar(min.x(), point.x()), SkMinScalar(min.y(), point.y()));
            max.set(SkMaxScalar(max.x(), point.x()), SkMaxScalar(max.y(), point.y()));
        }

        SkRect bounds = SkRect::MakeLTRB(min.x(), min.y(), max.x()+1, max.y()+1);

        this->drawRect(draw, bounds, paint);
    }
    virtual void drawRect(const SkDraw& draw, const SkRect& rect,
                          const SkPaint& paint) SK_OVERRIDE {
        SkBitmap bm;
        if (GetBitmapFromPaint(paint, &bm)) {
            SkRect mappedRect;
            draw.fMatrix->mapRect(&mappedRect, rect);
            SkRect clipRect = SkRect::Make(draw.fRC->getBounds());
            mappedRect.intersect(clipRect);
            fPRCont->add(bm.pixelRef(), mappedRect);
        }
    }
    virtual void drawOval(const SkDraw& draw, const SkRect& rect,
                          const SkPaint& paint) SK_OVERRIDE {
        this->drawRect(draw, rect, paint);
    }
    virtual void drawRRect(const SkDraw& draw, const SkRRect& rrect,
                           const SkPaint& paint) SK_OVERRIDE {
        this->drawRect(draw, rrect.rect(), paint);
    }
    virtual void drawPath(const SkDraw& draw, const SkPath& path,
                          const SkPaint& paint, const SkMatrix* prePathMatrix,
                          bool pathIsMutable) SK_OVERRIDE {
        SkBitmap bm;
        if (!GetBitmapFromPaint(paint, &bm)) {
            return;
        }

        SkRect pathBounds = path.getBounds();
        if (prePathMatrix) {
            prePathMatrix->mapRect(&pathBounds);
        }

        this->drawRect(draw, pathBounds, paint);
    }
    virtual void drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
                            const SkMatrix& matrix, const SkPaint& paint) SK_OVERRIDE {
        SkMatrix totMatrix;
        totMatrix.setConcat(*draw.fMatrix, matrix);

        SkRect bitmapRect = SkRect::MakeWH(SkIntToScalar(bitmap.width()),
                                           SkIntToScalar(bitmap.height()));
        SkRect mappedRect;
        totMatrix.mapRect(&mappedRect, bitmapRect);
        fPRCont->add(bitmap.pixelRef(), mappedRect);

        SkBitmap paintBitmap;
        if (GetBitmapFromPaint(paint, &paintBitmap)) {
            fPRCont->add(paintBitmap.pixelRef(), mappedRect);
        }
    }
    virtual void drawSprite(const SkDraw&, const SkBitmap& bitmap,
                            int x, int y, const SkPaint& paint) SK_OVERRIDE {
        // Sprites aren't affected by current matrix, so we can't reuse drawRect.
        SkMatrix matrix;
        matrix.setTranslate(SkIntToScalar(x), SkIntToScalar(y));

        SkRect bitmapRect = SkRect::MakeWH(SkIntToScalar(bitmap.width()),
                                           SkIntToScalar(bitmap.height()));
        SkRect mappedRect;
        matrix.mapRect(&mappedRect, bitmapRect);
        fPRCont->add(bitmap.pixelRef(), mappedRect);

        SkBitmap paintBitmap;
        if (GetBitmapFromPaint(paint, &paintBitmap)) {
            fPRCont->add(paintBitmap.pixelRef(), mappedRect);
        }
    }
    virtual void drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
                                const SkRect* srcOrNull, const SkRect& dst,
                                const SkPaint& paint,
                                SkCanvas::DrawBitmapRectFlags flags) SK_OVERRIDE {
        SkRect bitmapRect = SkRect::MakeWH(SkIntToScalar(bitmap.width()),
                                           SkIntToScalar(bitmap.height()));
        SkMatrix matrix;
        matrix.setRectToRect(bitmapRect, dst, SkMatrix::kFill_ScaleToFit);
        this->drawBitmap(draw, bitmap, matrix, paint);
    }
    virtual void drawText(const SkDraw& draw, const void* text, size_t len,
                          SkScalar x, SkScalar y,
                          const SkPaint& paint) SK_OVERRIDE {
        SkBitmap bitmap;
        if (!GetBitmapFromPaint(paint, &bitmap)) {
            return;
        }

        // Math is borrowed from SkBBoxRecord
        SkRect bounds;
        paint.measureText(text, len, &bounds);
        SkPaint::FontMetrics metrics;
        paint.getFontMetrics(&metrics);

        if (paint.isVerticalText()) {
            SkScalar h = bounds.fBottom - bounds.fTop;
            if (paint.getTextAlign() == SkPaint::kCenter_Align) {
                bounds.fTop -= h / 2;
                bounds.fBottom -= h / 2;
            }
            bounds.fBottom += metrics.fBottom;
            bounds.fTop += metrics.fTop;
        } else {
            SkScalar w = bounds.fRight - bounds.fLeft;
            if (paint.getTextAlign() == SkPaint::kCenter_Align) {
                bounds.fLeft -= w / 2;
                bounds.fRight -= w / 2;
            } else if (paint.getTextAlign() == SkPaint::kRight_Align) {
                bounds.fLeft -= w;
                bounds.fRight -= w;
            }
            bounds.fTop = metrics.fTop;
            bounds.fBottom = metrics.fBottom;
        }

        SkScalar pad = (metrics.fBottom - metrics.fTop) / 2;
        bounds.fLeft -= pad;
        bounds.fRight += pad;
        bounds.offset(x, y);

        this->drawRect(draw, bounds, paint);
    }
    virtual void drawPosText(const SkDraw& draw, const void* text, size_t len,
                             const SkScalar pos[], int scalarsPerPos,
                             const SkPoint& offset, const SkPaint& paint) SK_OVERRIDE {
        SkBitmap bitmap;
        if (!GetBitmapFromPaint(paint, &bitmap)) {
            return;
        }

        if (0 == len) {
            return;
        }

        // Similar to SkDraw asserts.
        SkASSERT(scalarsPerPos == 1 || scalarsPerPos == 2);

        SkPoint min = SkPoint::Make(offset.x() + pos[0],
                                    offset.y() + (2 == scalarsPerPos ? pos[1] : 0));
        SkPoint max = min;

        for (size_t i = 1; i < len; ++i) {
            SkScalar x = offset.x() + pos[i * scalarsPerPos];
            SkScalar y = offset.y() + (2 == scalarsPerPos ? pos[i * 2 + 1] : 0);

            min.set(SkMinScalar(x, min.x()), SkMinScalar(y, min.y()));
            max.set(SkMaxScalar(x, max.x()), SkMaxScalar(y, max.y()));
        }

        SkRect bounds = SkRect::MakeLTRB(min.x(), min.y(), max.x(), max.y());

        // Math is borrowed from SkBBoxRecord
        SkPaint::FontMetrics metrics;
        paint.getFontMetrics(&metrics);

        bounds.fTop += metrics.fTop;
        bounds.fBottom += metrics.fBottom;

        SkScalar pad = (metrics.fTop - metrics.fBottom) / 2;
        bounds.fLeft -= pad;
        bounds.fRight += pad;

        this->drawRect(draw, bounds, paint);
    }
    virtual void drawTextOnPath(const SkDraw& draw, const void* text, size_t len,
                                const SkPath& path, const SkMatrix* matrix,
                                const SkPaint& paint) SK_OVERRIDE {
        SkBitmap bitmap;
        if (!GetBitmapFromPaint(paint, &bitmap)) {
            return;
        }

        // Math is borrowed from SkBBoxRecord
        SkRect bounds = path.getBounds();
        SkPaint::FontMetrics metrics;
        paint.getFontMetrics(&metrics);

        SkScalar pad = metrics.fTop;
        // TODO: inset?!
        bounds.fLeft += pad;
        bounds.fRight -= pad;
        bounds.fTop += pad;
        bounds.fBottom -= pad;

        this->drawRect(draw, bounds, paint);
    }
    virtual void drawVertices(const SkDraw& draw, SkCanvas::VertexMode, int vertexCount,
                              const SkPoint verts[], const SkPoint texs[],
                              const SkColor colors[], SkXfermode* xmode,
                              const uint16_t indices[], int indexCount,
                              const SkPaint& paint) SK_OVERRIDE {
        this->drawPoints(draw, SkCanvas::kPolygon_PointMode, vertexCount, verts, paint);
    }
    virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
                            const SkPaint&) SK_OVERRIDE {
        NothingToDo();
    }
    // TODO: allow this call to return failure, or move to SkBitmapDevice only.
    virtual const SkBitmap& onAccessBitmap() SK_OVERRIDE {
        return fEmptyBitmap;
    }
    virtual void lockPixels() SK_OVERRIDE { NothingToDo(); }
    virtual void unlockPixels() SK_OVERRIDE { NothingToDo(); }
    virtual bool allowImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
    virtual bool canHandleImageFilter(const SkImageFilter*) SK_OVERRIDE { return false; }
    virtual bool filterImage(const SkImageFilter*, const SkBitmap&, const SkImageFilter::Context&,
                             SkBitmap* result, SkIPoint* offset) SK_OVERRIDE {
        return false;
    }

private:
    SkPictureUtils::SkPixelRefContainer* fPRCont;
    SkISize                              fSize;

    SkBitmap                             fEmptyBitmap; // legacy -- need to remove

    static bool GetBitmapFromPaint(const SkPaint &paint, SkBitmap* bitmap) {
        SkShader* shader = paint.getShader();
        if (shader) {
            if (SkShader::kNone_GradientType == shader->asAGradient(NULL)) {
                return SkShader::kNone_BitmapType != shader->asABitmap(bitmap, NULL, NULL);
            }
        }
        return false;
    }

    virtual void replaceBitmapBackendForRasterSurface(const SkBitmap&) SK_OVERRIDE {
        NotSupported();
    }

    virtual SkBaseDevice* onCreateCompatibleDevice(const CreateInfo& info) SK_OVERRIDE {
        // we expect to only get called via savelayer, in which case it is fine.
        SkASSERT(kSaveLayer_Usage == info.fUsage);
        return SkNEW_ARGS(SkGatherPixelRefsAndRectsDevice,
                          (info.fInfo.width(), info.fInfo.height(), fPRCont));
    }

    static void NotSupported() {
        SkDEBUGFAIL("this method should never be called");
    }

    static void NothingToDo() {}

    typedef SkBaseDevice INHERITED;
};

#endif // SkGatherPixelRefsAndRects_DEFINED