aboutsummaryrefslogtreecommitdiffhomepage
path: root/src/core/SkBitmapDevice.cpp
blob: fc0e63e9ae0b4ad93ea9806e243e1d6ae6549540 (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
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
/*
 * Copyright 2013 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "SkBitmapDevice.h"
#include "SkConfig8888.h"
#include "SkDraw.h"
#include "SkMallocPixelRef.h"
#include "SkMatrix.h"
#include "SkPaint.h"
#include "SkPath.h"
#include "SkPixelRef.h"
#include "SkPixmap.h"
#include "SkShader.h"
#include "SkSurface.h"
#include "SkXfermode.h"

class SkColorTable;

static bool valid_for_bitmap_device(const SkImageInfo& info,
                                    SkAlphaType* newAlphaType) {
    if (info.width() < 0 || info.height() < 0) {
        return false;
    }

    // TODO: can we stop supporting kUnknown in SkBitmkapDevice?
    if (kUnknown_SkColorType == info.colorType()) {
        if (newAlphaType) {
            *newAlphaType = kUnknown_SkAlphaType;
        }
        return true;
    }

    switch (info.alphaType()) {
        case kPremul_SkAlphaType:
        case kOpaque_SkAlphaType:
            break;
        default:
            return false;
    }

    SkAlphaType canonicalAlphaType = info.alphaType();

    switch (info.colorType()) {
        case kAlpha_8_SkColorType:
            break;
        case kRGB_565_SkColorType:
            canonicalAlphaType = kOpaque_SkAlphaType;
            break;
        case kN32_SkColorType:
            break;
        case kRGBA_F16_SkColorType:
            break;
        default:
            return false;
    }

    if (newAlphaType) {
        *newAlphaType = canonicalAlphaType;
    }
    return true;
}

SkBitmapDevice::SkBitmapDevice(const SkBitmap& bitmap)
    : INHERITED(SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType))
    , fBitmap(bitmap) {
    SkASSERT(valid_for_bitmap_device(bitmap.info(), nullptr));
}

SkBitmapDevice* SkBitmapDevice::Create(const SkImageInfo& info) {
    return Create(info, SkSurfaceProps(SkSurfaceProps::kLegacyFontHost_InitType));
}

SkBitmapDevice::SkBitmapDevice(const SkBitmap& bitmap, const SkSurfaceProps& surfaceProps)
    : INHERITED(surfaceProps)
    , fBitmap(bitmap) {
    SkASSERT(valid_for_bitmap_device(bitmap.info(), nullptr));
}

SkBitmapDevice* SkBitmapDevice::Create(const SkImageInfo& origInfo,
                                       const SkSurfaceProps& surfaceProps) {
    SkAlphaType newAT = origInfo.alphaType();
    if (!valid_for_bitmap_device(origInfo, &newAT)) {
        return nullptr;
    }

    const SkImageInfo info = origInfo.makeAlphaType(newAT);
    SkBitmap bitmap;

    if (kUnknown_SkColorType == info.colorType()) {
        if (!bitmap.setInfo(info)) {
            return nullptr;
        }
    } else if (info.isOpaque()) {
        // If this bitmap is opaque, we don't have any sensible default color,
        // so we just return uninitialized pixels.
        if (!bitmap.tryAllocPixels(info)) {
            return nullptr;
        }
    } else {
        // This bitmap has transparency, so we'll zero the pixels (to transparent).
        // We use a ZeroedPRFactory as a faster alloc-then-eraseColor(SK_ColorTRANSPARENT).
        SkMallocPixelRef::ZeroedPRFactory factory;
        if (!bitmap.tryAllocPixels(info, &factory, nullptr/*color table*/)) {
            return nullptr;
        }
    }

    return new SkBitmapDevice(bitmap, surfaceProps);
}

SkImageInfo SkBitmapDevice::imageInfo() const {
    return fBitmap.info();
}

void SkBitmapDevice::setNewSize(const SkISize& size) {
    SkASSERT(!fBitmap.pixelRef());
    fBitmap.setInfo(fBitmap.info().makeWH(size.fWidth, size.fHeight));
}

void SkBitmapDevice::replaceBitmapBackendForRasterSurface(const SkBitmap& bm) {
    SkASSERT(bm.width() == fBitmap.width());
    SkASSERT(bm.height() == fBitmap.height());
    fBitmap = bm;   // intent is to use bm's pixelRef (and rowbytes/config)
    fBitmap.lockPixels();
}

SkBaseDevice* SkBitmapDevice::onCreateDevice(const CreateInfo& cinfo, const SkPaint*) {
    const SkSurfaceProps surfaceProps(this->surfaceProps().flags(), cinfo.fPixelGeometry);
    return SkBitmapDevice::Create(cinfo.fInfo, surfaceProps);
}

const SkBitmap& SkBitmapDevice::onAccessBitmap() {
    return fBitmap;
}

bool SkBitmapDevice::onAccessPixels(SkPixmap* pmap) {
    if (fBitmap.lockPixelsAreWritable() && this->onPeekPixels(pmap)) {
        fBitmap.notifyPixelsChanged();
        return true;
    }
    return false;
}

bool SkBitmapDevice::onPeekPixels(SkPixmap* pmap) {
    const SkImageInfo info = fBitmap.info();
    if (fBitmap.getPixels() && (kUnknown_SkColorType != info.colorType())) {
        SkColorTable* ctable = nullptr;
        pmap->reset(fBitmap.info(), fBitmap.getPixels(), fBitmap.rowBytes(), ctable);
        return true;
    }
    return false;
}

bool SkBitmapDevice::onWritePixels(const SkImageInfo& srcInfo, const void* srcPixels,
                                   size_t srcRowBytes, int x, int y) {
    // since we don't stop creating un-pixeled devices yet, check for no pixels here
    if (nullptr == fBitmap.getPixels()) {
        return false;
    }

    const SkImageInfo dstInfo = fBitmap.info().makeWH(srcInfo.width(), srcInfo.height());

    void* dstPixels = fBitmap.getAddr(x, y);
    size_t dstRowBytes = fBitmap.rowBytes();

    if (SkPixelInfo::CopyPixels(dstInfo, dstPixels, dstRowBytes, srcInfo, srcPixels, srcRowBytes)) {
        fBitmap.notifyPixelsChanged();
        return true;
    }
    return false;
}

bool SkBitmapDevice::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
                                  int x, int y) {
    return fBitmap.readPixels(dstInfo, dstPixels, dstRowBytes, x, y);
}

void SkBitmapDevice::onAttachToCanvas(SkCanvas* canvas) {
    INHERITED::onAttachToCanvas(canvas);
    if (fBitmap.lockPixelsAreWritable()) {
        fBitmap.lockPixels();
    }
}

void SkBitmapDevice::onDetachFromCanvas() {
    INHERITED::onDetachFromCanvas();
    if (fBitmap.lockPixelsAreWritable()) {
        fBitmap.unlockPixels();
    }
}

///////////////////////////////////////////////////////////////////////////////

void SkBitmapDevice::drawPaint(const SkDraw& draw, const SkPaint& paint) {
    draw.drawPaint(paint);
}

void SkBitmapDevice::drawPoints(const SkDraw& draw, SkCanvas::PointMode mode, size_t count,
                                const SkPoint pts[], const SkPaint& paint) {
    draw.drawPoints(mode, count, pts, paint);
}

void SkBitmapDevice::drawRect(const SkDraw& draw, const SkRect& r, const SkPaint& paint) {
    draw.drawRect(r, paint);
}

void SkBitmapDevice::drawOval(const SkDraw& draw, const SkRect& oval, const SkPaint& paint) {
    SkPath path;
    path.addOval(oval);
    // call the VIRTUAL version, so any subclasses who do handle drawPath aren't
    // required to override drawOval.
    this->drawPath(draw, path, paint, nullptr, true);
}

void SkBitmapDevice::drawRRect(const SkDraw& draw, const SkRRect& rrect, const SkPaint& paint) {
#ifdef SK_IGNORE_BLURRED_RRECT_OPT
    SkPath  path;

    path.addRRect(rrect);
    // call the VIRTUAL version, so any subclasses who do handle drawPath aren't
    // required to override drawRRect.
    this->drawPath(draw, path, paint, nullptr, true);
#else
    draw.drawRRect(rrect, paint);
#endif
}

void SkBitmapDevice::drawPath(const SkDraw& draw, const SkPath& path,
                              const SkPaint& paint, const SkMatrix* prePathMatrix,
                              bool pathIsMutable) {
    draw.drawPath(path, paint, prePathMatrix, pathIsMutable);
}

void SkBitmapDevice::drawBitmap(const SkDraw& draw, const SkBitmap& bitmap,
                                const SkMatrix& matrix, const SkPaint& paint) {
    draw.drawBitmap(bitmap, matrix, nullptr, paint);
}

void SkBitmapDevice::drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
                                    const SkRect* src, const SkRect& dst,
                                    const SkPaint& paint, SkCanvas::SrcRectConstraint constraint) {
    SkMatrix    matrix;
    SkRect      bitmapBounds, tmpSrc, tmpDst;
    SkBitmap    tmpBitmap;

    bitmapBounds.isetWH(bitmap.width(), bitmap.height());

    // Compute matrix from the two rectangles
    if (src) {
        tmpSrc = *src;
    } else {
        tmpSrc = bitmapBounds;
    }
    matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);

    const SkRect* dstPtr = &dst;
    const SkBitmap* bitmapPtr = &bitmap;

    // clip the tmpSrc to the bounds of the bitmap, and recompute dstRect if
    // needed (if the src was clipped). No check needed if src==null.
    if (src) {
        if (!bitmapBounds.contains(*src)) {
            if (!tmpSrc.intersect(bitmapBounds)) {
                return; // nothing to draw
            }
            // recompute dst, based on the smaller tmpSrc
            matrix.mapRect(&tmpDst, tmpSrc);
            dstPtr = &tmpDst;
        }

        // since we may need to clamp to the borders of the src rect within
        // the bitmap, we extract a subset.
        const SkIRect srcIR = tmpSrc.roundOut();
        if(bitmap.pixelRef()->getTexture()) {
            // Accelerated source canvas, don't use extractSubset but readPixels to get the subset.
            // This way, the pixels are copied in CPU memory instead of GPU memory.
            bitmap.pixelRef()->readPixels(&tmpBitmap, kN32_SkColorType, &srcIR);
        } else {
            if (!bitmap.extractSubset(&tmpBitmap, srcIR)) {
                return;
            }
        }
        bitmapPtr = &tmpBitmap;

        // Since we did an extract, we need to adjust the matrix accordingly
        SkScalar dx = 0, dy = 0;
        if (srcIR.fLeft > 0) {
            dx = SkIntToScalar(srcIR.fLeft);
        }
        if (srcIR.fTop > 0) {
            dy = SkIntToScalar(srcIR.fTop);
        }
        if (dx || dy) {
            matrix.preTranslate(dx, dy);
        }

        SkRect extractedBitmapBounds;
        extractedBitmapBounds.isetWH(bitmapPtr->width(), bitmapPtr->height());
        if (extractedBitmapBounds == tmpSrc) {
            // no fractional part in src, we can just call drawBitmap
            goto USE_DRAWBITMAP;
        }
    } else {
        USE_DRAWBITMAP:
        // We can go faster by just calling drawBitmap, which will concat the
        // matrix with the CTM, and try to call drawSprite if it can. If not,
        // it will make a shader and call drawRect, as we do below.
        draw.drawBitmap(*bitmapPtr, matrix, dstPtr, paint);
        return;
    }

    // construct a shader, so we can call drawRect with the dst
    auto s = SkShader::MakeBitmapShader(*bitmapPtr, SkShader::kClamp_TileMode,
                                        SkShader::kClamp_TileMode, &matrix);
    if (!s) {
        return;
    }

    SkPaint paintWithShader(paint);
    paintWithShader.setStyle(SkPaint::kFill_Style);
    paintWithShader.setShader(std::move(s));

    // Call ourself, in case the subclass wanted to share this setup code
    // but handle the drawRect code themselves.
    this->drawRect(draw, *dstPtr, paintWithShader);
}

void SkBitmapDevice::drawSprite(const SkDraw& draw, const SkBitmap& bitmap,
                                int x, int y, const SkPaint& paint) {
    draw.drawSprite(bitmap, x, y, paint);
}

void SkBitmapDevice::drawText(const SkDraw& draw, const void* text, size_t len,
                              SkScalar x, SkScalar y, const SkPaint& paint) {
    draw.drawText((const char*)text, len, x, y, paint);
}

void SkBitmapDevice::drawPosText(const SkDraw& draw, const void* text, size_t len,
                                 const SkScalar xpos[], int scalarsPerPos,
                                 const SkPoint& offset, const SkPaint& paint) {
    draw.drawPosText((const char*)text, len, xpos, scalarsPerPos, offset, paint);
}

void SkBitmapDevice::drawVertices(const SkDraw& draw, SkCanvas::VertexMode vmode,
                                  int vertexCount,
                                  const SkPoint verts[], const SkPoint textures[],
                                  const SkColor colors[], SkXfermode* xmode,
                                  const uint16_t indices[], int indexCount,
                                  const SkPaint& paint) {
    draw.drawVertices(vmode, vertexCount, verts, textures, colors, xmode,
                      indices, indexCount, paint);
}

void SkBitmapDevice::drawDevice(const SkDraw& draw, SkBaseDevice* device,
                                int x, int y, const SkPaint& paint) {
    draw.drawSprite(static_cast<SkBitmapDevice*>(device)->fBitmap, x, y, paint);
}

SkSurface* SkBitmapDevice::newSurface(const SkImageInfo& info, const SkSurfaceProps& props) {
    return SkSurface::NewRaster(info, &props);
}

SkImageFilter::Cache* SkBitmapDevice::getImageFilterCache() {
    SkImageFilter::Cache* cache = SkImageFilter::Cache::Get();
    cache->ref();
    return cache;
}

///////////////////////////////////////////////////////////////////////////////

bool SkBitmapDevice::onShouldDisableLCD(const SkPaint& paint) const {
    if (kN32_SkColorType != fBitmap.colorType() ||
        paint.getRasterizer() ||
        paint.getPathEffect() ||
        paint.isFakeBoldText() ||
        paint.getStyle() != SkPaint::kFill_Style ||
        !SkXfermode::IsMode(paint.getXfermode(), SkXfermode::kSrcOver_Mode))
    {
        return true;
    }
    return false;
}