1 /*
2 * Copyright 2015 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
8 #include "include/core/SkPixmap.h"
9
10 #include "include/core/SkBitmap.h"
11 #include "include/core/SkData.h"
12 #include "include/core/SkSurface.h"
13 #include "include/core/SkUnPreMultiply.h"
14 #include "include/private/SkColorData.h"
15 #include "include/private/SkHalf.h"
16 #include "include/private/SkImageInfoPriv.h"
17 #include "include/private/SkNx.h"
18 #include "include/private/SkTPin.h"
19 #include "include/private/SkTemplates.h"
20 #include "include/private/SkTo.h"
21 #include "src/core/SkConvertPixels.h"
22 #include "src/core/SkDraw.h"
23 #include "src/core/SkMask.h"
24 #include "src/core/SkMatrixProvider.h"
25 #include "src/core/SkPixmapPriv.h"
26 #include "src/core/SkRasterClip.h"
27 #include "src/core/SkUtils.h"
28 #include "src/image/SkReadPixelsRec.h"
29 #include "src/shaders/SkImageShader.h"
30
31 #include <utility>
32
33 /////////////////////////////////////////////////////////////////////////////////////////////////
34
reset()35 void SkPixmap::reset() {
36 fPixels = nullptr;
37 fRowBytes = 0;
38 fInfo = SkImageInfo::MakeUnknown();
39 }
40
reset(const SkImageInfo & info,const void * addr,size_t rowBytes)41 void SkPixmap::reset(const SkImageInfo& info, const void* addr, size_t rowBytes) {
42 if (addr) {
43 SkASSERT(info.validRowBytes(rowBytes));
44 }
45 fPixels = addr;
46 fRowBytes = rowBytes;
47 fInfo = info;
48 }
49
reset(const SkMask & src)50 bool SkPixmap::reset(const SkMask& src) {
51 if (SkMask::kA8_Format == src.fFormat) {
52 this->reset(SkImageInfo::MakeA8(src.fBounds.width(), src.fBounds.height()),
53 src.fImage, src.fRowBytes);
54 return true;
55 }
56 this->reset();
57 return false;
58 }
59
setColorSpace(sk_sp<SkColorSpace> cs)60 void SkPixmap::setColorSpace(sk_sp<SkColorSpace> cs) {
61 fInfo = fInfo.makeColorSpace(std::move(cs));
62 }
63
extractSubset(SkPixmap * result,const SkIRect & subset) const64 bool SkPixmap::extractSubset(SkPixmap* result, const SkIRect& subset) const {
65 SkIRect srcRect, r;
66 srcRect.setWH(this->width(), this->height());
67 if (!r.intersect(srcRect, subset)) {
68 return false; // r is empty (i.e. no intersection)
69 }
70
71 // If the upper left of the rectangle was outside the bounds of this SkBitmap, we should have
72 // exited above.
73 SkASSERT(static_cast<unsigned>(r.fLeft) < static_cast<unsigned>(this->width()));
74 SkASSERT(static_cast<unsigned>(r.fTop) < static_cast<unsigned>(this->height()));
75
76 const void* pixels = nullptr;
77 if (fPixels) {
78 const size_t bpp = fInfo.bytesPerPixel();
79 pixels = (const uint8_t*)fPixels + r.fTop * fRowBytes + r.fLeft * bpp;
80 }
81 result->reset(fInfo.makeDimensions(r.size()), pixels, fRowBytes);
82 return true;
83 }
84
85 // This is the same as SkPixmap::addr(x,y), but this version gets inlined, while the public
86 // method does not. Perhaps we could bloat it so it can be inlined, but that would grow code-size
87 // everywhere, instead of just here (on behalf of getAlphaf()).
fast_getaddr(const SkPixmap & pm,int x,int y)88 static const void* fast_getaddr(const SkPixmap& pm, int x, int y) {
89 x <<= SkColorTypeShiftPerPixel(pm.colorType());
90 return static_cast<const char*>(pm.addr()) + y * pm.rowBytes() + x;
91 }
92
getAlphaf(int x,int y) const93 float SkPixmap::getAlphaf(int x, int y) const {
94 SkASSERT(this->addr());
95 SkASSERT((unsigned)x < (unsigned)this->width());
96 SkASSERT((unsigned)y < (unsigned)this->height());
97
98 float value = 0;
99 const void* srcPtr = fast_getaddr(*this, x, y);
100
101 switch (this->colorType()) {
102 case kUnknown_SkColorType:
103 return 0;
104 case kGray_8_SkColorType:
105 case kR8G8_unorm_SkColorType:
106 case kR16G16_unorm_SkColorType:
107 case kR16G16_float_SkColorType:
108 case kRGB_565_SkColorType:
109 case kRGB_888x_SkColorType:
110 case kRGB_101010x_SkColorType:
111 case kBGR_101010x_SkColorType:
112 return 1;
113 case kAlpha_8_SkColorType:
114 value = static_cast<const uint8_t*>(srcPtr)[0] * (1.0f/255);
115 break;
116 case kA16_unorm_SkColorType:
117 value = static_cast<const uint16_t*>(srcPtr)[0] * (1.0f/65535);
118 break;
119 case kA16_float_SkColorType: {
120 SkHalf half = static_cast<const SkHalf*>(srcPtr)[0];
121 value = SkHalfToFloat(half);
122 break;
123 }
124 case kARGB_4444_SkColorType: {
125 uint16_t u16 = static_cast<const uint16_t*>(srcPtr)[0];
126 value = SkGetPackedA4444(u16) * (1.0f/15);
127 break;
128 }
129 case kRGBA_8888_SkColorType:
130 case kBGRA_8888_SkColorType:
131 case kSRGBA_8888_SkColorType:
132 value = static_cast<const uint8_t*>(srcPtr)[3] * (1.0f/255);
133 break;
134 case kRGBA_1010102_SkColorType:
135 case kBGRA_1010102_SkColorType: {
136 uint32_t u32 = static_cast<const uint32_t*>(srcPtr)[0];
137 value = (u32 >> 30) * (1.0f/3);
138 break;
139 }
140 case kR16G16B16A16_unorm_SkColorType: {
141 uint64_t u64 = static_cast<const uint64_t*>(srcPtr)[0];
142 value = (u64 >> 48) * (1.0f/65535);
143 break;
144 }
145 case kRGBA_F16Norm_SkColorType:
146 case kRGBA_F16_SkColorType: {
147 uint64_t px;
148 memcpy(&px, srcPtr, sizeof(px));
149 value = SkHalfToFloat_finite_ftz(px)[3];
150 break;
151 }
152 case kRGBA_F32_SkColorType:
153 value = static_cast<const float*>(srcPtr)[3];
154 break;
155 }
156 return value;
157 }
158
readPixels(const SkImageInfo & dstInfo,void * dstPixels,size_t dstRB,int x,int y) const159 bool SkPixmap::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
160 int x, int y) const {
161 if (!SkImageInfoValidConversion(dstInfo, fInfo)) {
162 return false;
163 }
164
165 SkReadPixelsRec rec(dstInfo, dstPixels, dstRB, x, y);
166 if (!rec.trim(fInfo.width(), fInfo.height())) {
167 return false;
168 }
169
170 const void* srcPixels = this->addr(rec.fX, rec.fY);
171 const SkImageInfo srcInfo = fInfo.makeDimensions(rec.fInfo.dimensions());
172 return SkConvertPixels(rec.fInfo, rec.fPixels, rec.fRowBytes, srcInfo, srcPixels,
173 this->rowBytes());
174 }
175
erase(SkColor color,const SkIRect & subset) const176 bool SkPixmap::erase(SkColor color, const SkIRect& subset) const {
177 return this->erase(SkColor4f::FromColor(color), &subset);
178 }
179
erase(const SkColor4f & color,SkColorSpace * cs,const SkIRect * subset) const180 bool SkPixmap::erase(const SkColor4f& color, SkColorSpace* cs, const SkIRect* subset) const {
181 SkPaint paint;
182 paint.setBlendMode(SkBlendMode::kSrc);
183 paint.setColor4f(color, cs);
184
185 SkIRect clip = this->bounds();
186 if (subset && !clip.intersect(*subset)) {
187 return false;
188 }
189 SkRasterClip rc{clip};
190
191 SkDraw draw;
192 SkSimpleMatrixProvider matrixProvider(SkMatrix::I());
193 draw.fDst = *this;
194 draw.fMatrixProvider = &matrixProvider;
195 draw.fRC = &rc;
196
197 draw.drawPaint(paint);
198 return true;
199 }
200
scalePixels(const SkPixmap & actualDst,const SkSamplingOptions & sampling) const201 bool SkPixmap::scalePixels(const SkPixmap& actualDst, const SkSamplingOptions& sampling) const {
202 // We may need to tweak how we interpret these just a little below, so we make copies.
203 SkPixmap src = *this,
204 dst = actualDst;
205
206 // Can't do anthing with empty src or dst
207 if (src.width() <= 0 || src.height() <= 0 ||
208 dst.width() <= 0 || dst.height() <= 0) {
209 return false;
210 }
211
212 // no scaling involved?
213 if (src.width() == dst.width() && src.height() == dst.height()) {
214 return src.readPixels(dst);
215 }
216
217 // If src and dst are both unpremul, we'll fake the source out to appear as if premul,
218 // and mark the destination as opaque. This odd combination allows us to scale unpremul
219 // pixels without ever premultiplying them (perhaps losing information in the color channels).
220 // This is an idiosyncratic feature of scalePixels(), and is tested by scalepixels_unpremul GM.
221 bool clampAsIfUnpremul = false;
222 if (src.alphaType() == kUnpremul_SkAlphaType &&
223 dst.alphaType() == kUnpremul_SkAlphaType) {
224 src.reset(src.info().makeAlphaType(kPremul_SkAlphaType), src.addr(), src.rowBytes());
225 dst.reset(dst.info().makeAlphaType(kOpaque_SkAlphaType), dst.addr(), dst.rowBytes());
226
227 // We'll need to tell the image shader to clamp to [0,1] instead of the
228 // usual [0,a] when using a bicubic scaling (kHigh_SkFilterQuality).
229 clampAsIfUnpremul = true;
230 }
231
232 SkBitmap bitmap;
233 if (!bitmap.installPixels(src)) {
234 return false;
235 }
236 bitmap.setImmutable(); // Don't copy when we create an image.
237
238 SkMatrix scale = SkMatrix::RectToRect(SkRect::Make(src.bounds()), SkRect::Make(dst.bounds()));
239
240 sk_sp<SkShader> shader = SkImageShader::Make(bitmap.asImage(),
241 SkTileMode::kClamp,
242 SkTileMode::kClamp,
243 sampling,
244 &scale,
245 clampAsIfUnpremul);
246
247 sk_sp<SkSurface> surface = SkSurface::MakeRasterDirect(dst.info(),
248 dst.writable_addr(),
249 dst.rowBytes());
250 if (!shader || !surface) {
251 return false;
252 }
253
254 SkPaint paint;
255 paint.setBlendMode(SkBlendMode::kSrc);
256 paint.setShader(std::move(shader));
257 surface->getCanvas()->drawPaint(paint);
258 return true;
259 }
260
261 //////////////////////////////////////////////////////////////////////////////////////////////////
262
getColor(int x,int y) const263 SkColor SkPixmap::getColor(int x, int y) const {
264 SkASSERT(this->addr());
265 SkASSERT((unsigned)x < (unsigned)this->width());
266 SkASSERT((unsigned)y < (unsigned)this->height());
267
268 const bool needsUnpremul = (kPremul_SkAlphaType == fInfo.alphaType());
269 auto toColor = [needsUnpremul](uint32_t maybePremulColor) {
270 return needsUnpremul ? SkUnPreMultiply::PMColorToColor(maybePremulColor)
271 : SkSwizzle_BGRA_to_PMColor(maybePremulColor);
272 };
273
274 switch (this->colorType()) {
275 case kGray_8_SkColorType: {
276 uint8_t value = *this->addr8(x, y);
277 return SkColorSetRGB(value, value, value);
278 }
279 case kAlpha_8_SkColorType: {
280 return SkColorSetA(0, *this->addr8(x, y));
281 }
282 case kA16_unorm_SkColorType: {
283 uint16_t value = *this->addr16(x, y);
284 return SkColorSetA(0, value * (255 / 65535.0f));
285 }
286 case kA16_float_SkColorType: {
287 SkHalf value = *this->addr16(x, y);
288 return SkColorSetA(0, 255 * SkHalfToFloat(value));
289 }
290 case kRGB_565_SkColorType: {
291 return SkPixel16ToColor(*this->addr16(x, y));
292 }
293 case kARGB_4444_SkColorType: {
294 uint16_t value = *this->addr16(x, y);
295 SkPMColor c = SkPixel4444ToPixel32(value);
296 return toColor(c);
297 }
298 case kR8G8_unorm_SkColorType: {
299 uint16_t value = *this->addr16(x, y);
300 return (uint32_t)( ((value >> 0) & 0xff) ) << 16
301 | (uint32_t)( ((value >> 8) & 0xff) ) << 8
302 | 0xff000000;
303 }
304 case kR16G16_unorm_SkColorType: {
305 uint32_t value = *this->addr32(x, y);
306 return (uint32_t)( ((value >> 0) & 0xffff) * (255/65535.0f) ) << 16
307 | (uint32_t)( ((value >> 16) & 0xffff) * (255/65535.0f) ) << 8
308 | 0xff000000;
309 }
310 case kR16G16_float_SkColorType: {
311 uint32_t value = *this->addr32(x, y);
312 uint32_t r = 255 * SkHalfToFloat((value >> 0) & 0xffff);
313 uint32_t g = 255 * SkHalfToFloat((value >> 16) & 0xffff);
314 return (r << 16) | (g << 8) | 0xff000000;
315 }
316 case kRGB_888x_SkColorType: {
317 uint32_t value = *this->addr32(x, y);
318 return SkSwizzle_RB(value | 0xff000000);
319 }
320 case kBGRA_8888_SkColorType: {
321 uint32_t value = *this->addr32(x, y);
322 SkPMColor c = SkSwizzle_BGRA_to_PMColor(value);
323 return toColor(c);
324 }
325 case kRGBA_8888_SkColorType: {
326 uint32_t value = *this->addr32(x, y);
327 SkPMColor c = SkSwizzle_RGBA_to_PMColor(value);
328 return toColor(c);
329 }
330 case kSRGBA_8888_SkColorType: {
331 auto srgb_to_linear = [](float x) {
332 return (x <= 0.04045f) ? x * (1 / 12.92f)
333 : sk_float_pow(x * (1 / 1.055f) + (0.055f / 1.055f), 2.4f);
334 };
335
336 uint32_t value = *this->addr32(x, y);
337 float r = ((value >> 0) & 0xff) * (1/255.0f),
338 g = ((value >> 8) & 0xff) * (1/255.0f),
339 b = ((value >> 16) & 0xff) * (1/255.0f),
340 a = ((value >> 24) & 0xff) * (1/255.0f);
341 r = srgb_to_linear(r);
342 g = srgb_to_linear(g);
343 b = srgb_to_linear(b);
344 if (a != 0 && needsUnpremul) {
345 r = SkTPin(r/a, 0.0f, 1.0f);
346 g = SkTPin(g/a, 0.0f, 1.0f);
347 b = SkTPin(b/a, 0.0f, 1.0f);
348 }
349 return (uint32_t)( r * 255.0f ) << 16
350 | (uint32_t)( g * 255.0f ) << 8
351 | (uint32_t)( b * 255.0f ) << 0
352 | (uint32_t)( a * 255.0f ) << 24;
353 }
354 case kRGB_101010x_SkColorType: {
355 uint32_t value = *this->addr32(x, y);
356 // Convert 10-bit rgb to 8-bit bgr, and mask in 0xff alpha at the top.
357 return (uint32_t)( ((value >> 0) & 0x3ff) * (255/1023.0f) ) << 16
358 | (uint32_t)( ((value >> 10) & 0x3ff) * (255/1023.0f) ) << 8
359 | (uint32_t)( ((value >> 20) & 0x3ff) * (255/1023.0f) ) << 0
360 | 0xff000000;
361 }
362 case kBGR_101010x_SkColorType: {
363 uint32_t value = *this->addr32(x, y);
364 // Convert 10-bit bgr to 8-bit bgr, and mask in 0xff alpha at the top.
365 return (uint32_t)( ((value >> 0) & 0x3ff) * (255/1023.0f) ) << 0
366 | (uint32_t)( ((value >> 10) & 0x3ff) * (255/1023.0f) ) << 8
367 | (uint32_t)( ((value >> 20) & 0x3ff) * (255/1023.0f) ) << 16
368 | 0xff000000;
369 }
370 case kRGBA_1010102_SkColorType:
371 case kBGRA_1010102_SkColorType: {
372 uint32_t value = *this->addr32(x, y);
373
374 float r = ((value >> 0) & 0x3ff) * (1/1023.0f),
375 g = ((value >> 10) & 0x3ff) * (1/1023.0f),
376 b = ((value >> 20) & 0x3ff) * (1/1023.0f),
377 a = ((value >> 30) & 0x3 ) * (1/ 3.0f);
378 if (this->colorType() == kBGRA_1010102_SkColorType) {
379 std::swap(r,b);
380 }
381 if (a != 0 && needsUnpremul) {
382 r = SkTPin(r/a, 0.0f, 1.0f);
383 g = SkTPin(g/a, 0.0f, 1.0f);
384 b = SkTPin(b/a, 0.0f, 1.0f);
385 }
386 return (uint32_t)( r * 255.0f ) << 16
387 | (uint32_t)( g * 255.0f ) << 8
388 | (uint32_t)( b * 255.0f ) << 0
389 | (uint32_t)( a * 255.0f ) << 24;
390 }
391 case kR16G16B16A16_unorm_SkColorType: {
392 uint64_t value = *this->addr64(x, y);
393
394 float r = ((value ) & 0xffff) * (1/65535.0f),
395 g = ((value >> 16) & 0xffff) * (1/65535.0f),
396 b = ((value >> 32) & 0xffff) * (1/65535.0f),
397 a = ((value >> 48) & 0xffff) * (1/65535.0f);
398 if (a != 0 && needsUnpremul) {
399 r *= (1.0f/a);
400 g *= (1.0f/a);
401 b *= (1.0f/a);
402 }
403 return (uint32_t)( r * 255.0f ) << 16
404 | (uint32_t)( g * 255.0f ) << 8
405 | (uint32_t)( b * 255.0f ) << 0
406 | (uint32_t)( a * 255.0f ) << 24;
407 }
408 case kRGBA_F16Norm_SkColorType:
409 case kRGBA_F16_SkColorType: {
410 const uint64_t* addr =
411 (const uint64_t*)fPixels + y * (fRowBytes >> 3) + x;
412 Sk4f p4 = SkHalfToFloat_finite_ftz(*addr);
413 if (p4[3] && needsUnpremul) {
414 float inva = 1 / p4[3];
415 p4 = p4 * Sk4f(inva, inva, inva, 1);
416 }
417 SkColor c;
418 SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
419 // p4 is RGBA, but we want BGRA, so we need to swap next
420 return SkSwizzle_RB(c);
421 }
422 case kRGBA_F32_SkColorType: {
423 const float* rgba =
424 (const float*)fPixels + 4*y*(fRowBytes >> 4) + 4*x;
425 Sk4f p4 = Sk4f::Load(rgba);
426 // From here on, just like F16:
427 if (p4[3] && needsUnpremul) {
428 float inva = 1 / p4[3];
429 p4 = p4 * Sk4f(inva, inva, inva, 1);
430 }
431 SkColor c;
432 SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
433 // p4 is RGBA, but we want BGRA, so we need to swap next
434 return SkSwizzle_RB(c);
435 }
436 case kUnknown_SkColorType:
437 break;
438 }
439 SkDEBUGFAIL("");
440 return SkColorSetARGB(0, 0, 0, 0);
441 }
442
computeIsOpaque() const443 bool SkPixmap::computeIsOpaque() const {
444 const int height = this->height();
445 const int width = this->width();
446
447 switch (this->colorType()) {
448 case kAlpha_8_SkColorType: {
449 unsigned a = 0xFF;
450 for (int y = 0; y < height; ++y) {
451 const uint8_t* row = this->addr8(0, y);
452 for (int x = 0; x < width; ++x) {
453 a &= row[x];
454 }
455 if (0xFF != a) {
456 return false;
457 }
458 }
459 return true;
460 }
461 case kA16_unorm_SkColorType: {
462 unsigned a = 0xFFFF;
463 for (int y = 0; y < height; ++y) {
464 const uint16_t* row = this->addr16(0, y);
465 for (int x = 0; x < width; ++x) {
466 a &= row[x];
467 }
468 if (0xFFFF != a) {
469 return false;
470 }
471 }
472 return true;
473 }
474 case kA16_float_SkColorType: {
475 for (int y = 0; y < height; ++y) {
476 const SkHalf* row = this->addr16(0, y);
477 for (int x = 0; x < width; ++x) {
478 if (row[x] < SK_Half1) {
479 return false;
480 }
481 }
482 }
483 return true;
484 }
485 case kRGB_565_SkColorType:
486 case kGray_8_SkColorType:
487 case kR8G8_unorm_SkColorType:
488 case kR16G16_unorm_SkColorType:
489 case kR16G16_float_SkColorType:
490 case kRGB_888x_SkColorType:
491 case kRGB_101010x_SkColorType:
492 case kBGR_101010x_SkColorType:
493 return true;
494 break;
495 case kARGB_4444_SkColorType: {
496 unsigned c = 0xFFFF;
497 for (int y = 0; y < height; ++y) {
498 const SkPMColor16* row = this->addr16(0, y);
499 for (int x = 0; x < width; ++x) {
500 c &= row[x];
501 }
502 if (0xF != SkGetPackedA4444(c)) {
503 return false;
504 }
505 }
506 return true;
507 }
508 case kBGRA_8888_SkColorType:
509 case kRGBA_8888_SkColorType:
510 case kSRGBA_8888_SkColorType: {
511 SkPMColor c = (SkPMColor)~0;
512 for (int y = 0; y < height; ++y) {
513 const SkPMColor* row = this->addr32(0, y);
514 for (int x = 0; x < width; ++x) {
515 c &= row[x];
516 }
517 if (0xFF != SkGetPackedA32(c)) {
518 return false;
519 }
520 }
521 return true;
522 }
523 case kRGBA_F16Norm_SkColorType:
524 case kRGBA_F16_SkColorType: {
525 const SkHalf* row = (const SkHalf*)this->addr();
526 for (int y = 0; y < height; ++y) {
527 for (int x = 0; x < width; ++x) {
528 if (row[4 * x + 3] < SK_Half1) {
529 return false;
530 }
531 }
532 row += this->rowBytes() >> 1;
533 }
534 return true;
535 }
536 case kRGBA_F32_SkColorType: {
537 const float* row = (const float*)this->addr();
538 for (int y = 0; y < height; ++y) {
539 for (int x = 0; x < width; ++x) {
540 if (row[4 * x + 3] < 1.0f) {
541 return false;
542 }
543 }
544 row += this->rowBytes() >> 2;
545 }
546 return true;
547 }
548 case kRGBA_1010102_SkColorType:
549 case kBGRA_1010102_SkColorType: {
550 uint32_t c = ~0;
551 for (int y = 0; y < height; ++y) {
552 const uint32_t* row = this->addr32(0, y);
553 for (int x = 0; x < width; ++x) {
554 c &= row[x];
555 }
556 if (0b11 != c >> 30) {
557 return false;
558 }
559 }
560 return true;
561 }
562 case kR16G16B16A16_unorm_SkColorType: {
563 uint16_t acc = 0xFFFF;
564 for (int y = 0; y < height; ++y) {
565 const uint64_t* row = this->addr64(0, y);
566 for (int x = 0; x < width; ++x) {
567 acc &= (row[x] >> 48);
568 }
569 if (0xFFFF != acc) {
570 return false;
571 }
572 }
573 return true;
574 }
575 case kUnknown_SkColorType:
576 SkDEBUGFAIL("");
577 break;
578 }
579 return false;
580 }
581
582 //////////////////////////////////////////////////////////////////////////////////////////////////
583
draw_orientation(const SkPixmap & dst,const SkPixmap & src,SkEncodedOrigin origin)584 static bool draw_orientation(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin origin) {
585 auto surf = SkSurface::MakeRasterDirect(dst.info(), dst.writable_addr(), dst.rowBytes());
586 if (!surf) {
587 return false;
588 }
589
590 SkBitmap bm;
591 bm.installPixels(src);
592
593 SkMatrix m = SkEncodedOriginToMatrix(origin, dst.width(), dst.height());
594
595 SkPaint p;
596 p.setBlendMode(SkBlendMode::kSrc);
597 surf->getCanvas()->concat(m);
598 surf->getCanvas()->drawImage(SkImage::MakeFromBitmap(bm), 0, 0, SkSamplingOptions(), &p);
599 return true;
600 }
601
Orient(const SkPixmap & dst,const SkPixmap & src,SkEncodedOrigin origin)602 bool SkPixmapPriv::Orient(const SkPixmap& dst, const SkPixmap& src, SkEncodedOrigin origin) {
603 if (src.colorType() != dst.colorType()) {
604 return false;
605 }
606 // note: we just ignore alphaType and colorSpace for this transformation
607
608 int w = src.width();
609 int h = src.height();
610 if (SkEncodedOriginSwapsWidthHeight(origin)) {
611 using std::swap;
612 swap(w, h);
613 }
614 if (dst.width() != w || dst.height() != h) {
615 return false;
616 }
617 if (w == 0 || h == 0) {
618 return true;
619 }
620
621 // check for aliasing to self
622 if (src.addr() == dst.addr()) {
623 return kTopLeft_SkEncodedOrigin == origin;
624 }
625 return draw_orientation(dst, src, origin);
626 }
627
SwapWidthHeight(const SkImageInfo & info)628 SkImageInfo SkPixmapPriv::SwapWidthHeight(const SkImageInfo& info) {
629 return info.makeWH(info.height(), info.width());
630 }
631
632