1 /*
2  * Copyright 2016 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 "GrBitmapTextureMaker.h"
9 
10 #include "GrContext.h"
11 #include "GrContextPriv.h"
12 #include "GrGpuResourcePriv.h"
13 #include "GrProxyProvider.h"
14 #include "GrSurfaceContext.h"
15 #include "SkBitmap.h"
16 #include "SkGr.h"
17 #include "SkMipMap.h"
18 #include "SkPixelRef.h"
19 
bmp_is_alpha_only(const SkBitmap & bm)20 static bool bmp_is_alpha_only(const SkBitmap& bm) { return kAlpha_8_SkColorType == bm.colorType(); }
21 
GrBitmapTextureMaker(GrContext * context,const SkBitmap & bitmap)22 GrBitmapTextureMaker::GrBitmapTextureMaker(GrContext* context, const SkBitmap& bitmap)
23     : INHERITED(context, bitmap.width(), bitmap.height(), bmp_is_alpha_only(bitmap))
24     , fBitmap(bitmap) {
25     if (!bitmap.isVolatile()) {
26         SkIPoint origin = bitmap.pixelRefOrigin();
27         SkIRect subset = SkIRect::MakeXYWH(origin.fX, origin.fY, bitmap.width(),
28                                            bitmap.height());
29         GrMakeKeyFromImageID(&fOriginalKey, bitmap.pixelRef()->getGenerationID(), subset);
30     }
31 }
32 
refOriginalTextureProxy(bool willBeMipped,SkColorSpace * dstColorSpace,AllowedTexGenType onlyIfFast)33 sk_sp<GrTextureProxy> GrBitmapTextureMaker::refOriginalTextureProxy(bool willBeMipped,
34                                                                     SkColorSpace* dstColorSpace,
35                                                                     AllowedTexGenType onlyIfFast) {
36     if (AllowedTexGenType::kCheap == onlyIfFast) {
37         return nullptr;
38     }
39 
40     GrProxyProvider* proxyProvider = this->context()->contextPriv().proxyProvider();
41     sk_sp<GrTextureProxy> proxy;
42 
43     if (fOriginalKey.isValid()) {
44         proxy = proxyProvider->findOrCreateProxyByUniqueKey(fOriginalKey, kTopLeft_GrSurfaceOrigin);
45         if (proxy && (!willBeMipped || GrMipMapped::kYes == proxy->mipMapped())) {
46             return proxy;
47         }
48     }
49 
50     if (!proxy) {
51         if (willBeMipped) {
52             proxy = proxyProvider->createMipMapProxyFromBitmap(fBitmap, dstColorSpace);
53         }
54         if (!proxy) {
55             proxy = GrUploadBitmapToTextureProxy(proxyProvider, fBitmap, dstColorSpace);
56         }
57         if (proxy) {
58             if (fOriginalKey.isValid()) {
59                 proxyProvider->assignUniqueKeyToProxy(fOriginalKey, proxy.get());
60             }
61             if (!willBeMipped || GrMipMapped::kYes == proxy->mipMapped()) {
62                 SkASSERT(proxy->origin() == kTopLeft_GrSurfaceOrigin);
63                 if (fOriginalKey.isValid()) {
64                     GrInstallBitmapUniqueKeyInvalidator(fOriginalKey, fBitmap.pixelRef());
65                 }
66                 return proxy;
67             }
68         }
69     }
70 
71     if (proxy) {
72         SkASSERT(willBeMipped);
73         SkASSERT(GrMipMapped::kNo == proxy->mipMapped());
74         // We need a mipped proxy, but we either found a proxy earlier that wasn't mipped or
75         // generated a non mipped proxy. Thus we generate a new mipped surface and copy the original
76         // proxy into the base layer. We will then let the gpu generate the rest of the mips.
77         if (auto mippedProxy = GrCopyBaseMipMapToTextureProxy(this->context(), proxy.get())) {
78             SkASSERT(mippedProxy->origin() == kTopLeft_GrSurfaceOrigin);
79             if (fOriginalKey.isValid()) {
80                 // In this case we are stealing the key from the original proxy which should only
81                 // happen when we have just generated mipmaps for an originally unmipped
82                 // proxy/texture. This means that all future uses of the key will access the
83                 // mipmapped version. The texture backing the unmipped version will remain in the
84                 // resource cache until the last texture proxy referencing it is deleted at which
85                 // time it too will be deleted or recycled.
86                 proxyProvider->removeUniqueKeyFromProxy(fOriginalKey, proxy.get());
87                 proxyProvider->assignUniqueKeyToProxy(fOriginalKey, mippedProxy.get());
88                 GrInstallBitmapUniqueKeyInvalidator(fOriginalKey, fBitmap.pixelRef());
89             }
90             return mippedProxy;
91         }
92         // We failed to make a mipped proxy with the base copied into it. This could have
93         // been from failure to make the proxy or failure to do the copy. Thus we will fall
94         // back to just using the non mipped proxy; See skbug.com/7094.
95         return proxy;
96     }
97     return nullptr;
98 }
99 
makeCopyKey(const CopyParams & copyParams,GrUniqueKey * copyKey,SkColorSpace * dstColorSpace)100 void GrBitmapTextureMaker::makeCopyKey(const CopyParams& copyParams, GrUniqueKey* copyKey,
101                                        SkColorSpace* dstColorSpace) {
102     // Destination color space is irrelevant - we always upload the bitmap's contents as-is
103     if (fOriginalKey.isValid()) {
104         MakeCopyKeyFromOrigKey(fOriginalKey, copyParams, copyKey);
105     }
106 }
107 
didCacheCopy(const GrUniqueKey & copyKey)108 void GrBitmapTextureMaker::didCacheCopy(const GrUniqueKey& copyKey) {
109     GrInstallBitmapUniqueKeyInvalidator(copyKey, fBitmap.pixelRef());
110 }
111 
alphaType() const112 SkAlphaType GrBitmapTextureMaker::alphaType() const {
113     return fBitmap.alphaType();
114 }
115 
getColorSpace(SkColorSpace * dstColorSpace)116 sk_sp<SkColorSpace> GrBitmapTextureMaker::getColorSpace(SkColorSpace* dstColorSpace) {
117     // Color space doesn't depend on destination color space - it's just whatever is in the bitmap
118     return fBitmap.refColorSpace();
119 }
120