gfx/layers/GLImages.cpp

   1
   2 #include "GLImages.h"
   3 #include "GLContext.h"
   4 #include "GLContextProvider.h"
   5 #include "ScopedGLHelpers.h"
   6 #include "GLImages.h"
   7 #include "GLBlitHelper.h"
   8 #include "GLReadTexImageHelper.h"
   9 #include "GLLibraryEGL.h"
  10
  11 using namespace mozilla;
  12 using namespace mozilla::gl;
  13
  14 namespace mozilla {
  15 namespace layers {
  16
  17 static nsRefPtr<GLContext> sSnapshotContext;
  18
  19 EGLImageImage::~EGLImageImage()
  20 {
  21   if (!mData.mOwns) {
  22     return;
  23   }
  24
  25   if (mData.mImage) {
  26     sEGLLibrary.fDestroyImage(EGL_DISPLAY(), mData.mImage);
  27     mData.mImage = nullptr;
  28   }
  29
  30   if (mData.mSync) {
  31     sEGLLibrary.fDestroySync(EGL_DISPLAY(), mData.mSync);
  32     mData.mSync = nullptr;
  33   }
  34 }
  35
  36 TemporaryRef<gfx::SourceSurface>
  37 GLImage::GetAsSourceSurface()
  38 {
  39   MOZ_ASSERT(NS_IsMainThread(), "Should be on the main thread");
  40
  41   if (!sSnapshotContext) {
  42     sSnapshotContext = GLContextProvider::CreateHeadless();
  43     if (!sSnapshotContext) {
  44       NS_WARNING("Failed to create snapshot GLContext");
  45       return nullptr;
  46     }
  47   }
  48
  49   sSnapshotContext->MakeCurrent();
  50   ScopedTexture scopedTex(sSnapshotContext);
  51   ScopedBindTexture boundTex(sSnapshotContext, scopedTex.Texture());
  52
  53   gfx::IntSize size = GetSize();
  54   sSnapshotContext->fTexImage2D(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA,
  55                                 size.width, size.height, 0,
  56                                 LOCAL_GL_RGBA,
  57                                 LOCAL_GL_UNSIGNED_BYTE,
  58                                 nullptr);
  59
  60   ScopedFramebufferForTexture fb(sSnapshotContext, scopedTex.Texture());
  61
  62   GLBlitHelper helper(sSnapshotContext);
  63
  64   if (!helper.BlitImageToFramebuffer(this, size, fb.FB(), true)) {
  65     return nullptr;
  66   }
  67
  68   RefPtr<gfx::DataSourceSurface> source =
  69         gfx::Factory::CreateDataSourceSurface(size, gfx::SurfaceFormat::B8G8R8A8);
  70   if (NS_WARN_IF(!source)) {
  71     return nullptr;
  72   }
  73
  74   ScopedBindFramebuffer bind(sSnapshotContext, fb.FB());
  75   ReadPixelsIntoDataSurface(sSnapshotContext, source);
  76   return source.forget();
  77 }
  78
  79 } // layers
  80 } // mozilla