Make copySurface work in more situations.

src/gpu/gl/GrGLCaps.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "GrGLCaps.h"
 
@@ skipping 36 matching lines @@
     fUseNonVBOVertexAndIndexDynamicData = false;
     fIsCoreProfile = false;
     fBindFragDataLocationSupport = false;
     fExternalTextureSupport = false;
     fRectangleTextureSupport = false;
     fTextureSwizzleSupport = false;
     fSRGBWriteControl = false;
     fRGBA8888PixelsOpsAreSlow = false;
     fPartialFBOReadIsSlow = false;
 
+    fBlitFramebufferSupport = kNone_BlitFramebufferSupport;
+
     fShaderCaps.reset(new GrGLSLCaps(contextOptions));
 
     this->init(contextOptions, ctxInfo, glInterface);
 }
 
 void GrGLCaps::init(const GrContextOptions& contextOptions,
                     const GrGLContextInfo& ctxInfo,
                     const GrGLInterface* gli) {
     GrGLStandard standard = ctxInfo.standard();
     GrGLVersion version = ctxInfo.version();
@@ skipping 692 matching lines @@
             fMSFBOType = kMixedSamples_MSFBOType;
         } else if (ctxInfo.version() >= GR_GL_VER(3,0)) {
             fMSFBOType = GrGLCaps::kES_3_0_MSFBOType;
         } else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
             // chrome's extension is equivalent to the EXT msaa
             // and fbo_blit extensions.
             fMSFBOType = kDesktop_EXT_MSFBOType;
         } else if (ctxInfo.hasExtension("GL_APPLE_framebuffer_multisample")) {
             fMSFBOType = kES_Apple_MSFBOType;
         }
+
+        // Above determined the preferred MSAA approach, now decide whether glBlitFramebuffer
+        // is available.
+        if (ctxInfo.version() >= GR_GL_VER(3, 0)) {
+            fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
+        } else if (ctxInfo.hasExtension("GL_CHROMIUM_framebuffer_multisample")) {
+            // The CHROMIUM extension uses the ANGLE version of glBlitFramebuffer and includes its
+            // limitations.
+            fBlitFramebufferSupport = kNoScalingNoMirroring_BlitFramebufferSupport;
+        }
     } else {
         if (fUsesMixedSamples) {
             fMSFBOType = kMixedSamples_MSFBOType;
+            fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
         } else if ((ctxInfo.version() >= GR_GL_VER(3,0)) ||
             ctxInfo.hasExtension("GL_ARB_framebuffer_object")) {
             fMSFBOType = GrGLCaps::kDesktop_ARB_MSFBOType;
+            fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
         } else if (ctxInfo.hasExtension("GL_EXT_framebuffer_multisample") &&
                    ctxInfo.hasExtension("GL_EXT_framebuffer_blit")) {
             fMSFBOType = GrGLCaps::kDesktop_EXT_MSFBOType;
+            fBlitFramebufferSupport = kFull_BlitFramebufferSupport;
         }
     }
 }
 
 void GrGLCaps::initBlendEqationSupport(const GrGLContextInfo& ctxInfo) {
     GrGLSLCaps* glslCaps = static_cast<GrGLSLCaps*>(fShaderCaps.get());
 
     // Disabling advanced blend on various platforms with major known issues. We also block Chrome
     // for now until its own blacklists can be updated.
     if (kAdreno4xx_GrGLRenderer == ctxInfo.renderer() ||
@@ skipping 876 matching lines @@
         for (int j = 0; j < kExternalFormatUsageCnt; ++j) {
             SkASSERT(defaultEntry.fFormats.fExternalFormat[j] !=
                      fConfigTable[i].fFormats.fExternalFormat[j]);
         }
         SkASSERT(defaultEntry.fFormats.fExternalType != fConfigTable[i].fFormats.fExternalType);
     }
 #endif
 }
 
 void GrGLCaps::onApplyOptionsOverrides(const GrContextOptions& options) {}