1/*
2 * Copyright 2012 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 "SkBitmap.h"
9#include "SkBitmapCache.h"
10#include "SkCanvas.h"
11#include "SkData.h"
12#include "SkImageEncoder.h"
13#include "SkImageFilter.h"
14#include "SkImageFilterCache.h"
15#include "SkImageGenerator.h"
16#include "SkImagePriv.h"
17#include "SkImageShader.h"
18#include "SkImage_Base.h"
19#include "SkNextID.h"
20#include "SkPicture.h"
21#include "SkPixelRef.h"
22#include "SkReadPixelsRec.h"
23#include "SkSpecialImage.h"
24#include "SkString.h"
25#include "SkSurface.h"
26
27#if SK_SUPPORT_GPU
28#include "GrTexture.h"
29#include "GrContext.h"
30#include "SkImage_Gpu.h"
31#endif
32
33SkImage::SkImage(int width, int height, uint32_t uniqueID)
34    : fWidth(width)
35    , fHeight(height)
36    , fUniqueID(kNeedNewImageUniqueID == uniqueID ? SkNextID::ImageID() : uniqueID)
37{
38    SkASSERT(width > 0);
39    SkASSERT(height > 0);
40}
41
42bool SkImage::peekPixels(SkPixmap* pm) const {
43    SkPixmap tmp;
44    if (!pm) {
45        pm = &tmp;
46    }
47    return as_IB(this)->onPeekPixels(pm);
48}
49
50bool SkImage::readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
51                           int srcX, int srcY, CachingHint chint) const {
52    return as_IB(this)->onReadPixels(dstInfo, dstPixels, dstRowBytes, srcX, srcY, chint);
53}
54
55bool SkImage::scalePixels(const SkPixmap& dst, SkFilterQuality quality, CachingHint chint) const {
56    if (this->width() == dst.width() && this->height() == dst.height()) {
57        return this->readPixels(dst, 0, 0, chint);
58    }
59
60    // Idea: If/when SkImageGenerator supports a native-scaling API (where the generator itself
61    //       can scale more efficiently) we should take advantage of it here.
62    //
63    SkBitmap bm;
64    if (as_IB(this)->getROPixels(&bm, dst.info().colorSpace(), chint)) {
65        SkPixmap pmap;
66        // Note: By calling the pixmap scaler, we never cache the final result, so the chint
67        //       is (currently) only being applied to the getROPixels. If we get a request to
68        //       also attempt to cache the final (scaled) result, we would add that logic here.
69        //
70        return bm.peekPixels(&pmap) && pmap.scalePixels(dst, quality);
71    }
72    return false;
73}
74
75///////////////////////////////////////////////////////////////////////////////////////////////////
76
77SkAlphaType SkImage::alphaType() const {
78    return as_IB(this)->onAlphaType();
79}
80
81SkColorSpace* SkImage::colorSpace() const {
82    return as_IB(this)->onImageInfo().colorSpace();
83}
84
85sk_sp<SkColorSpace> SkImage::refColorSpace() const {
86    return as_IB(this)->onImageInfo().refColorSpace();
87}
88
89sk_sp<SkShader> SkImage::makeShader(SkShader::TileMode tileX, SkShader::TileMode tileY,
90                                    const SkMatrix* localMatrix) const {
91    return SkImageShader::Make(sk_ref_sp(const_cast<SkImage*>(this)), tileX, tileY, localMatrix);
92}
93
94sk_sp<SkData> SkImage::encodeToData(SkEncodedImageFormat type, int quality) const {
95    SkBitmap bm;
96    SkColorSpace* legacyColorSpace = nullptr;
97    if (as_IB(this)->getROPixels(&bm, legacyColorSpace)) {
98        return SkEncodeBitmap(bm, type, quality);
99    }
100    return nullptr;
101}
102
103sk_sp<SkData> SkImage::encodeToData() const {
104    if (auto encoded = this->refEncodedData()) {
105        return encoded;
106    }
107
108    SkBitmap bm;
109    SkPixmap pmap;
110    SkColorSpace* legacyColorSpace = nullptr;
111    if (as_IB(this)->getROPixels(&bm, legacyColorSpace) && bm.peekPixels(&pmap)) {
112        return SkEncodePixmap(pmap, SkEncodedImageFormat::kPNG, 100);
113    }
114    return nullptr;
115}
116
117sk_sp<SkData> SkImage::refEncodedData() const {
118    return sk_sp<SkData>(as_IB(this)->onRefEncoded());
119}
120
121sk_sp<SkImage> SkImage::MakeFromEncoded(sk_sp<SkData> encoded, const SkIRect* subset) {
122    if (nullptr == encoded || 0 == encoded->size()) {
123        return nullptr;
124    }
125    return SkImage::MakeFromGenerator(SkImageGenerator::MakeFromEncoded(encoded), subset);
126}
127
128///////////////////////////////////////////////////////////////////////////////////////////////////
129
130const char* SkImage::toString(SkString* str) const {
131    str->appendf("image: (id:%d (%d, %d) %s)", this->uniqueID(), this->width(), this->height(),
132                 this->isOpaque() ? "opaque" : "");
133    return str->c_str();
134}
135
136sk_sp<SkImage> SkImage::makeSubset(const SkIRect& subset) const {
137    if (subset.isEmpty()) {
138        return nullptr;
139    }
140
141    const SkIRect bounds = SkIRect::MakeWH(this->width(), this->height());
142    if (!bounds.contains(subset)) {
143        return nullptr;
144    }
145
146    // optimization : return self if the subset == our bounds
147    if (bounds == subset) {
148        return sk_ref_sp(const_cast<SkImage*>(this));
149    }
150    return as_IB(this)->onMakeSubset(subset);
151}
152
153#if SK_SUPPORT_GPU
154
155GrTexture* SkImage::getTexture() const {
156    return as_IB(this)->onGetTexture();
157}
158
159bool SkImage::isTextureBacked() const { return SkToBool(as_IB(this)->peekProxy()); }
160
161GrBackendObject SkImage::getTextureHandle(bool flushPendingGrContextIO,
162                                          GrSurfaceOrigin* origin) const {
163    return as_IB(this)->onGetTextureHandle(flushPendingGrContextIO, origin);
164}
165
166bool SkImage::isValid(GrContext* context) const {
167    if (context && context->abandoned()) {
168        return false;
169    }
170    return as_IB(this)->onIsValid(context);
171}
172
173#else
174
175GrTexture* SkImage::getTexture() const { return nullptr; }
176
177bool SkImage::isTextureBacked() const { return false; }
178
179GrBackendObject SkImage::getTextureHandle(bool, GrSurfaceOrigin*) const { return 0; }
180
181bool SkImage::isValid(GrContext* context) const {
182    if (context) {
183        return false;
184    }
185    return as_IB(this)->onIsValid(context);
186}
187
188#endif
189
190///////////////////////////////////////////////////////////////////////////////
191
192SkImage_Base::SkImage_Base(int width, int height, uint32_t uniqueID)
193    : INHERITED(width, height, uniqueID)
194    , fAddedToCache(false)
195{}
196
197SkImage_Base::~SkImage_Base() {
198    if (fAddedToCache.load()) {
199        SkNotifyBitmapGenIDIsStale(this->uniqueID());
200    }
201}
202
203bool SkImage::readPixels(const SkPixmap& pmap, int srcX, int srcY, CachingHint chint) const {
204    return this->readPixels(pmap.info(), pmap.writable_addr(), pmap.rowBytes(), srcX, srcY, chint);
205}
206
207///////////////////////////////////////////////////////////////////////////////////////////////////
208
209sk_sp<SkImage> SkImage::MakeFromBitmap(const SkBitmap& bm) {
210    SkPixelRef* pr = bm.pixelRef();
211    if (nullptr == pr) {
212        return nullptr;
213    }
214
215    return SkMakeImageFromRasterBitmap(bm, kIfMutable_SkCopyPixelsMode);
216}
217
218bool SkImage::asLegacyBitmap(SkBitmap* bitmap, LegacyBitmapMode ) const {
219    return as_IB(this)->onAsLegacyBitmap(bitmap);
220}
221
222bool SkImage_Base::onAsLegacyBitmap(SkBitmap* bitmap) const {
223    // As the base-class, all we can do is make a copy (regardless of mode).
224    // Subclasses that want to be more optimal should override.
225    SkImageInfo info = this->onImageInfo().makeColorType(kN32_SkColorType).makeColorSpace(nullptr);
226    if (!bitmap->tryAllocPixels(info)) {
227        return false;
228    }
229    if (!this->readPixels(bitmap->info(), bitmap->getPixels(), bitmap->rowBytes(), 0, 0)) {
230        bitmap->reset();
231        return false;
232    }
233
234    bitmap->setImmutable();
235    return true;
236}
237
238sk_sp<SkImage> SkImage::MakeFromPicture(sk_sp<SkPicture> picture, const SkISize& dimensions,
239                                        const SkMatrix* matrix, const SkPaint* paint,
240                                        BitDepth bitDepth, sk_sp<SkColorSpace> colorSpace) {
241    return MakeFromGenerator(SkImageGenerator::MakeFromPicture(dimensions, std::move(picture),
242                                                               matrix, paint, bitDepth,
243                                                               std::move(colorSpace)));
244}
245
246sk_sp<SkImage> SkImage::makeWithFilter(const SkImageFilter* filter, const SkIRect& subset,
247                                       const SkIRect& clipBounds, SkIRect* outSubset,
248                                       SkIPoint* offset) const {
249    if (!filter || !outSubset || !offset || !this->bounds().contains(subset)) {
250        return nullptr;
251    }
252    SkColorSpace* colorSpace = as_IB(this)->onImageInfo().colorSpace();
253    sk_sp<SkSpecialImage> srcSpecialImage = SkSpecialImage::MakeFromImage(
254        subset, sk_ref_sp(const_cast<SkImage*>(this)), colorSpace);
255    if (!srcSpecialImage) {
256        return nullptr;
257    }
258
259    sk_sp<SkImageFilterCache> cache(
260        SkImageFilterCache::Create(SkImageFilterCache::kDefaultTransientSize));
261    SkImageFilter::OutputProperties outputProperties(colorSpace);
262    SkImageFilter::Context context(SkMatrix::I(), clipBounds, cache.get(), outputProperties);
263
264    sk_sp<SkSpecialImage> result = filter->filterImage(srcSpecialImage.get(), context, offset);
265    if (!result) {
266        return nullptr;
267    }
268
269    *outSubset = SkIRect::MakeWH(result->width(), result->height());
270    if (!outSubset->intersect(clipBounds.makeOffset(-offset->x(), -offset->y()))) {
271        return nullptr;
272    }
273    offset->fX += outSubset->x();
274    offset->fY += outSubset->y();
275
276    // Note that here we're returning the special image's entire backing store, loose padding
277    // and all!
278    return result->asImage();
279}
280
281bool SkImage::isLazyGenerated() const {
282    return as_IB(this)->onIsLazyGenerated();
283}
284
285bool SkImage::isAlphaOnly() const {
286    return as_IB(this)->onImageInfo().colorType() == kAlpha_8_SkColorType;
287}
288
289sk_sp<SkImage> SkImage::makeColorSpace(sk_sp<SkColorSpace> target,
290                                       SkTransferFunctionBehavior premulBehavior) const {
291    SkColorSpaceTransferFn fn;
292    if (!target || !target->isNumericalTransferFn(&fn)) {
293        return nullptr;
294    }
295
296    // No need to create a new image if:
297    // (1) The color spaces are equal.
298    // (2) The color type is kAlpha8.
299    if (SkColorSpace::Equals(this->colorSpace(), target.get()) ||
300            kAlpha_8_SkColorType == as_IB(this)->onImageInfo().colorType()) {
301        return sk_ref_sp(const_cast<SkImage*>(this));
302    }
303
304    SkColorType targetColorType = kN32_SkColorType;
305    if (SkTransferFunctionBehavior::kRespect == premulBehavior && target->gammaIsLinear()) {
306        targetColorType = kRGBA_F16_SkColorType;
307    }
308
309    // TODO: We might consider making this a deferred conversion?
310    return as_IB(this)->onMakeColorSpace(std::move(target), targetColorType, premulBehavior);
311}
312
313sk_sp<SkImage> SkImage::makeNonTextureImage() const {
314    if (!this->isTextureBacked()) {
315        return sk_ref_sp(const_cast<SkImage*>(this));
316    }
317    return this->makeRasterImage();
318}
319
320sk_sp<SkImage> SkImage::makeRasterImage() const {
321    SkPixmap pm;
322    if (this->peekPixels(&pm)) {
323        return sk_ref_sp(const_cast<SkImage*>(this));
324    }
325
326    const SkImageInfo info = as_IB(this)->onImageInfo();
327    const size_t rowBytes = info.minRowBytes();
328    size_t size = info.computeByteSize(rowBytes);
329    if (SkImageInfo::ByteSizeOverflowed(size)) {
330        return nullptr;
331    }
332
333    sk_sp<SkData> data = SkData::MakeUninitialized(size);
334    pm = { info.makeColorSpace(nullptr), data->writable_data(), info.minRowBytes() };
335    if (!this->readPixels(pm, 0, 0)) {
336        return nullptr;
337    }
338
339    return SkImage::MakeRasterData(info, std::move(data), rowBytes);
340}
341
342//////////////////////////////////////////////////////////////////////////////////////
343
344#if !SK_SUPPORT_GPU
345
346sk_sp<SkImage> SkImage::MakeFromTexture(GrContext* ctx,
347                                        const GrBackendTexture& tex, GrSurfaceOrigin origin,
348                                        SkAlphaType at, sk_sp<SkColorSpace> cs,
349                                        TextureReleaseProc releaseP, ReleaseContext releaseC) {
350    return nullptr;
351}
352
353bool SkImage::MakeBackendTextureFromSkImage(GrContext*,
354                                            sk_sp<SkImage>,
355                                            GrBackendTexture*,
356                                            BackendTextureReleaseProc*) {
357    return false;
358}
359
360sk_sp<SkImage> SkImage::MakeFromAdoptedTexture(GrContext* ctx,
361                                               const GrBackendTexture& tex, GrSurfaceOrigin origin,
362                                               SkAlphaType at, sk_sp<SkColorSpace> cs) {
363    return nullptr;
364}
365
366sk_sp<SkImage> SkImage::MakeFromAdoptedTexture(GrContext* ctx,
367                                               const GrBackendTexture& tex, GrSurfaceOrigin origin,
368                                               SkColorType ct, SkAlphaType at,
369                                               sk_sp<SkColorSpace> cs) {
370    return nullptr;
371}
372
373sk_sp<SkImage> SkImage::MakeFromYUVTexturesCopy(GrContext* ctx, SkYUVColorSpace space,
374                                                const GrBackendObject yuvTextureHandles[3],
375                                                const SkISize yuvSizes[3],
376                                                GrSurfaceOrigin origin,
377                                                sk_sp<SkColorSpace> imageColorSpace) {
378    return nullptr;
379}
380
381sk_sp<SkImage> SkImage::MakeFromYUVTexturesCopy(GrContext* ctx, SkYUVColorSpace space,
382                                                const GrBackendTexture yuvTextureHandles[3],
383                                                const SkISize yuvSizes[3],
384                                                GrSurfaceOrigin origin,
385                                                sk_sp<SkColorSpace> imageColorSpace) {
386    return nullptr;
387}
388
389sk_sp<SkImage> SkImage::makeTextureImage(GrContext*, SkColorSpace* dstColorSpace) const {
390    return nullptr;
391}
392
393#endif
394
395///////////////////////////////////////////////////////////////////////////////////////////////////
396
397bool SkImage_pinAsTexture(const SkImage* image, GrContext* ctx) {
398    SkASSERT(image);
399    SkASSERT(ctx);
400    return as_IB(image)->onPinAsTexture(ctx);
401}
402
403void SkImage_unpinAsTexture(const SkImage* image, GrContext* ctx) {
404    SkASSERT(image);
405    SkASSERT(ctx);
406    as_IB(image)->onUnpinAsTexture(ctx);
407}
408
409///////////////////////////////////////////////////////////////////////////////////////////////////
410
411sk_sp<SkImage> SkImageMakeRasterCopyAndAssignColorSpace(const SkImage* src,
412                                                        SkColorSpace* colorSpace) {
413    // Read the pixels out of the source image, with no conversion
414    SkImageInfo info = as_IB(src)->onImageInfo();
415    if (kUnknown_SkColorType == info.colorType()) {
416        SkDEBUGFAIL("Unexpected color type");
417        return nullptr;
418    }
419
420    size_t rowBytes = info.minRowBytes();
421    size_t size = info.computeByteSize(rowBytes);
422    if (SkImageInfo::ByteSizeOverflowed(size)) {
423        return nullptr;
424    }
425    auto data = SkData::MakeUninitialized(size);
426    if (!data) {
427        return nullptr;
428    }
429
430    SkPixmap pm(info, data->writable_data(), rowBytes);
431    if (!src->readPixels(pm, 0, 0, SkImage::kDisallow_CachingHint)) {
432        return nullptr;
433    }
434
435    // Wrap them in a new image with a different color space
436    return SkImage::MakeRasterData(info.makeColorSpace(sk_ref_sp(colorSpace)), data, rowBytes);
437}
438