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      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 
     20 static bool bmp_is_alpha_only(const SkBitmap& bm) { return kAlpha_8_SkColorType == bm.colorType(); }
     21 
     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 
     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 
    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 
    108 void GrBitmapTextureMaker::didCacheCopy(const GrUniqueKey& copyKey) {
    109     GrInstallBitmapUniqueKeyInvalidator(copyKey, fBitmap.pixelRef());
    110 }
    111 
    112 SkAlphaType GrBitmapTextureMaker::alphaType() const {
    113     return fBitmap.alphaType();
    114 }
    115 
    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