1 files changed, 453 insertions, 0 deletions
diff --git a/gfx/gl/GLTextureImage.cpp b/gfx/gl/GLTextureImage.cpp
new file mode 100644
index 0000000000..e2295753fc
--- /dev/null
+++ b/gfx/gl/GLTextureImage.cpp
@@ -0,0 +1,453 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 4; -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GLTextureImage.h"
+#include "GLContext.h"
+#include "gfxContext.h"
+#include "gfxPlatform.h"
+#include "gfxUtils.h"
+#include "gfx2DGlue.h"
+#include "mozilla/gfx/2D.h"
+#include "ScopedGLHelpers.h"
+#include "GLUploadHelpers.h"
+#include "GfxTexturesReporter.h"
+
+using namespace mozilla::gfx;
+
+namespace mozilla {
+namespace gl {
+
+already_AddRefed<TextureImage> CreateTextureImage(
+    GLContext* gl, const gfx::IntSize& aSize,
+    TextureImage::ContentType aContentType, GLenum aWrapMode,
+    TextureImage::Flags aFlags, TextureImage::ImageFormat aImageFormat) {
+  GLint maxTextureSize;
+  gl->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_SIZE, &maxTextureSize);
+  if (aSize.width > maxTextureSize || aSize.height > maxTextureSize) {
+    NS_ASSERTION(aWrapMode == LOCAL_GL_CLAMP_TO_EDGE,
+                 "Can't support wrapping with tiles!");
+    return CreateTiledTextureImage(gl, aSize, aContentType, aFlags,
+                                   aImageFormat);
+  } else {
+    return CreateBasicTextureImage(gl, aSize, aContentType, aWrapMode, aFlags);
+  }
+}
+
+static already_AddRefed<TextureImage> TileGenFunc(
+    GLContext* gl, const IntSize& aSize, TextureImage::ContentType aContentType,
+    TextureImage::Flags aFlags, TextureImage::ImageFormat aImageFormat) {
+  return CreateBasicTextureImage(gl, aSize, aContentType,
+                                 LOCAL_GL_CLAMP_TO_EDGE, aFlags);
+}
+
+already_AddRefed<TextureImage> TextureImage::Create(
+    GLContext* gl, const gfx::IntSize& size,
+    TextureImage::ContentType contentType, GLenum wrapMode,
+    TextureImage::Flags flags) {
+  return CreateTextureImage(gl, size, contentType, wrapMode, flags);
+}
+
+bool TextureImage::UpdateFromDataSource(gfx::DataSourceSurface* aSurface,
+                                        const nsIntRegion* aDestRegion,
+                                        const gfx::IntPoint* aSrcOffset,
+                                        const gfx::IntPoint* aDstOffset) {
+  nsIntRegion destRegion = aDestRegion
+                               ? *aDestRegion
+                               : IntRect(0, 0, aSurface->GetSize().width,
+                                         aSurface->GetSize().height);
+  gfx::IntPoint srcPoint = aSrcOffset ? *aSrcOffset : gfx::IntPoint(0, 0);
+  gfx::IntPoint srcPointOut = aDstOffset ? *aDstOffset : gfx::IntPoint(0, 0);
+  return DirectUpdate(aSurface, destRegion, srcPoint, srcPointOut);
+}
+
+gfx::IntRect TextureImage::GetTileRect() {
+  return gfx::IntRect(gfx::IntPoint(0, 0), mSize);
+}
+
+gfx::IntRect TextureImage::GetSrcTileRect() { return GetTileRect(); }
+
+void TextureImage::UpdateUploadSize(size_t amount) {
+  if (mUploadSize > 0) {
+    GfxTexturesReporter::UpdateAmount(GfxTexturesReporter::MemoryFreed,
+                                      mUploadSize);
+  }
+  mUploadSize = amount;
+  GfxTexturesReporter::UpdateAmount(GfxTexturesReporter::MemoryAllocated,
+                                    mUploadSize);
+}
+
+BasicTextureImage::~BasicTextureImage() {
+  GLContext* ctx = mGLContext;
+  if (ctx->IsDestroyed() || !ctx->IsValidOwningThread()) {
+    ctx = ctx->GetSharedContext();
+  }
+
+  // If we have a context, then we need to delete the texture;
+  // if we don't have a context (either real or shared),
+  // then they went away when the contex was deleted, because it
+  // was the only one that had access to it.
+  if (ctx && ctx->MakeCurrent()) {
+    ctx->fDeleteTextures(1, &mTexture);
+  }
+}
+
+void BasicTextureImage::BindTexture(GLenum aTextureUnit) {
+  mGLContext->fActiveTexture(aTextureUnit);
+  mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, mTexture);
+  mGLContext->fActiveTexture(LOCAL_GL_TEXTURE0);
+}
+
+bool BasicTextureImage::DirectUpdate(
+    gfx::DataSourceSurface* aSurf, const nsIntRegion& aRegion,
+    const gfx::IntPoint& aSrcOffset /* = gfx::IntPoint(0, 0) */,
+    const gfx::IntPoint& aDstOffset /* = gfx::IntPoint(0, 0) */) {
+  nsIntRegion region;
+  if (mTextureState == Valid) {
+    region = aRegion;
+  } else {
+    region = nsIntRegion(IntRect(0, 0, mSize.width, mSize.height));
+  }
+  bool needInit = mTextureState == Created;
+  size_t uploadSize;
+
+  mTextureFormat =
+      UploadSurfaceToTexture(mGLContext, aSurf, region, mTexture, mSize,
+                             &uploadSize, needInit, aSrcOffset, aDstOffset);
+  if (mTextureFormat == SurfaceFormat::UNKNOWN) {
+    return false;
+  }
+
+  if (uploadSize > 0) {
+    UpdateUploadSize(uploadSize);
+  }
+  mTextureState = Valid;
+  return true;
+}
+
+void BasicTextureImage::Resize(const gfx::IntSize& aSize) {
+  mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, mTexture);
+
+  // This matches the logic in UploadImageDataToTexture so that
+  // we avoid mixing formats.
+  GLenum format;
+  GLenum type;
+  if (mGLContext->GetPreferredARGB32Format() == LOCAL_GL_BGRA) {
+    MOZ_ASSERT(!mGLContext->IsGLES());
+    format = LOCAL_GL_BGRA;
+    type = LOCAL_GL_UNSIGNED_INT_8_8_8_8_REV;
+  } else {
+    format = LOCAL_GL_RGBA;
+    type = LOCAL_GL_UNSIGNED_BYTE;
+  }
+
+  mGLContext->fTexImage2D(LOCAL_GL_TEXTURE_2D, 0, LOCAL_GL_RGBA, aSize.width,
+                          aSize.height, 0, format, type, nullptr);
+
+  mTextureState = Allocated;
+  mSize = aSize;
+}
+
+gfx::IntSize TextureImage::GetSize() const { return mSize; }
+
+TextureImage::TextureImage(const gfx::IntSize& aSize, GLenum aWrapMode,
+                           ContentType aContentType, Flags aFlags)
+    : mSize(aSize),
+      mWrapMode(aWrapMode),
+      mContentType(aContentType),
+      mTextureFormat(gfx::SurfaceFormat::UNKNOWN),
+      mSamplingFilter(SamplingFilter::GOOD),
+      mFlags(aFlags),
+      mUploadSize(0) {}
+
+BasicTextureImage::BasicTextureImage(GLuint aTexture, const gfx::IntSize& aSize,
+                                     GLenum aWrapMode, ContentType aContentType,
+                                     GLContext* aContext,
+                                     TextureImage::Flags aFlags)
+    : TextureImage(aSize, aWrapMode, aContentType, aFlags),
+      mTexture(aTexture),
+      mTextureState(Created),
+      mGLContext(aContext) {}
+
+static bool WantsSmallTiles(GLContext* gl) {
+  // We can't use small tiles on the SGX 540, because of races in texture
+  // upload.
+  if (gl->WorkAroundDriverBugs() && gl->Renderer() == GLRenderer::SGX540)
+    return false;
+
+  // We should use small tiles for good performance if we can't use
+  // glTexSubImage2D() for some reason.
+  if (!ShouldUploadSubTextures(gl)) return true;
+
+  // Don't use small tiles otherwise. (If we implement incremental texture
+  // upload, then we will want to revisit this.)
+  return false;
+}
+
+TiledTextureImage::TiledTextureImage(GLContext* aGL, gfx::IntSize aSize,
+                                     TextureImage::ContentType aContentType,
+                                     TextureImage::Flags aFlags,
+                                     TextureImage::ImageFormat aImageFormat)
+    : TextureImage(aSize, LOCAL_GL_CLAMP_TO_EDGE, aContentType, aFlags),
+      mCurrentImage(0),
+      mIterationCallback(nullptr),
+      mIterationCallbackData(nullptr),
+      mTileSize(0),
+      mRows(0),
+      mColumns(0),
+      mGL(aGL),
+      mTextureState(Created),
+      mImageFormat(aImageFormat) {
+  if (!(aFlags & TextureImage::DisallowBigImage) && WantsSmallTiles(mGL)) {
+    mTileSize = 256;
+  } else {
+    mGL->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_SIZE, (GLint*)&mTileSize);
+  }
+  if (aSize.width != 0 && aSize.height != 0) {
+    Resize(aSize);
+  }
+}
+
+TiledTextureImage::~TiledTextureImage() = default;
+
+bool TiledTextureImage::DirectUpdate(
+    gfx::DataSourceSurface* aSurf, const nsIntRegion& aRegion,
+    const gfx::IntPoint& aSrcOffset /* = gfx::IntPoint(0, 0) */,
+    const gfx::IntPoint& aDstOffset /* = gfx::IntPoint(0, 0) */) {
+  // We don't handle non-zero aDstOffset
+  MOZ_RELEASE_ASSERT(aDstOffset == gfx::IntPoint());
+
+  if (mSize.width == 0 || mSize.height == 0) {
+    return true;
+  }
+
+  nsIntRegion region;
+
+  if (mTextureState != Valid) {
+    IntRect bounds = IntRect(0, 0, mSize.width, mSize.height);
+    region = nsIntRegion(bounds);
+  } else {
+    region = aRegion;
+  }
+
+  bool result = true;
+  int oldCurrentImage = mCurrentImage;
+  BeginBigImageIteration();
+  do {
+    IntRect tileRect = GetSrcTileRect();
+    int xPos = tileRect.X();
+    int yPos = tileRect.Y();
+
+    nsIntRegion tileRegion;
+    tileRegion.And(region, tileRect);  // intersect with tile
+
+    if (tileRegion.IsEmpty()) continue;
+
+    tileRegion.MoveBy(-xPos, -yPos);  // translate into tile local space
+
+    result &= mImages[mCurrentImage]->DirectUpdate(
+        aSurf, tileRegion, aSrcOffset + gfx::IntPoint(xPos, yPos));
+
+    if (mCurrentImage == mImages.Length() - 1) {
+      // We know we're done, but we still need to ensure that the callback
+      // gets called (e.g. to update the uploaded region).
+      NextTile();
+      break;
+    }
+    // Override a callback cancelling iteration if the texture wasn't valid.
+    // We need to force the update in that situation, or we may end up
+    // showing invalid/out-of-date texture data.
+  } while (NextTile() || (mTextureState != Valid));
+  mCurrentImage = oldCurrentImage;
+
+  mTextureFormat = mImages[0]->GetTextureFormat();
+  mTextureState = Valid;
+  return result;
+}
+
+void TiledTextureImage::BeginBigImageIteration() { mCurrentImage = 0; }
+
+bool TiledTextureImage::NextTile() {
+  bool continueIteration = true;
+
+  if (mIterationCallback)
+    continueIteration =
+        mIterationCallback(this, mCurrentImage, mIterationCallbackData);
+
+  if (mCurrentImage + 1 < mImages.Length()) {
+    mCurrentImage++;
+    return continueIteration;
+  }
+  return false;
+}
+
+void TiledTextureImage::SetIterationCallback(
+    BigImageIterationCallback aCallback, void* aCallbackData) {
+  mIterationCallback = aCallback;
+  mIterationCallbackData = aCallbackData;
+}
+
+gfx::IntRect TiledTextureImage::GetTileRect() {
+  if (!GetTileCount()) {
+    return gfx::IntRect();
+  }
+  gfx::IntRect rect = mImages[mCurrentImage]->GetTileRect();
+  unsigned int xPos = (mCurrentImage % mColumns) * mTileSize;
+  unsigned int yPos = (mCurrentImage / mColumns) * mTileSize;
+  rect.MoveBy(xPos, yPos);
+  return rect;
+}
+
+gfx::IntRect TiledTextureImage::GetSrcTileRect() {
+  gfx::IntRect rect = GetTileRect();
+  const bool needsYFlip = mFlags & OriginBottomLeft;
+  unsigned int srcY =
+      needsYFlip ? mSize.height - rect.Height() - rect.Y() : rect.Y();
+  return gfx::IntRect(rect.X(), srcY, rect.Width(), rect.Height());
+}
+
+void TiledTextureImage::BindTexture(GLenum aTextureUnit) {
+  if (!GetTileCount()) {
+    return;
+  }
+  mImages[mCurrentImage]->BindTexture(aTextureUnit);
+}
+
+/*
+ * Resize, trying to reuse tiles. The reuse strategy is to decide on reuse per
+ * column. A tile on a column is reused if it hasn't changed size, otherwise it
+ * is discarded/replaced. Extra tiles on a column are pruned after iterating
+ * each column, and extra rows are pruned after iteration over the entire image
+ * finishes.
+ */
+void TiledTextureImage::Resize(const gfx::IntSize& aSize) {
+  if (mSize == aSize && mTextureState != Created) {
+    return;
+  }
+
+  // calculate rows and columns, rounding up
+  unsigned int columns = (aSize.width + mTileSize - 1) / mTileSize;
+  unsigned int rows = (aSize.height + mTileSize - 1) / mTileSize;
+
+  // Iterate over old tile-store and insert/remove tiles as necessary
+  int row;
+  unsigned int i = 0;
+  for (row = 0; row < (int)rows; row++) {
+    // If we've gone beyond how many rows there were before, set mColumns to
+    // zero so that we only create new tiles.
+    if (row >= (int)mRows) mColumns = 0;
+
+    // Similarly, if we're on the last row of old tiles and the height has
+    // changed, discard all tiles in that row.
+    // This will cause the pruning of columns not to work, but we don't need
+    // to worry about that, as no more tiles will be reused past this point
+    // anyway.
+    if ((row == (int)mRows - 1) && (aSize.height != mSize.height)) mColumns = 0;
+
+    int col;
+    for (col = 0; col < (int)columns; col++) {
+      IntSize size(  // use tilesize first, then the remainder
+          (col + 1) * mTileSize > (unsigned int)aSize.width
+              ? aSize.width % mTileSize
+              : mTileSize,
+          (row + 1) * mTileSize > (unsigned int)aSize.height
+              ? aSize.height % mTileSize
+              : mTileSize);
+
+      bool replace = false;
+
+      // Check if we can re-use old tiles.
+      if (col < (int)mColumns) {
+        // Reuse an existing tile. If the tile is an end-tile and the
+        // width differs, replace it instead.
+        if (mSize.width != aSize.width) {
+          if (col == (int)mColumns - 1) {
+            // Tile at the end of the old column, replace it with
+            // a new one.
+            replace = true;
+          } else if (col == (int)columns - 1) {
+            // Tile at the end of the new column, create a new one.
+          } else {
+            // Before the last column on both the old and new sizes,
+            // reuse existing tile.
+            i++;
+            continue;
+          }
+        } else {
+          // Width hasn't changed, reuse existing tile.
+          i++;
+          continue;
+        }
+      }
+
+      // Create a new tile.
+      RefPtr<TextureImage> teximg =
+          TileGenFunc(mGL, size, mContentType, mFlags, mImageFormat);
+      if (replace)
+        mImages.ReplaceElementAt(i, teximg);
+      else
+        mImages.InsertElementAt(i, teximg);
+      i++;
+    }
+
+    // Prune any unused tiles on the end of the column.
+    if (row < (int)mRows) {
+      for (col = (int)mColumns - col; col > 0; col--) {
+        mImages.RemoveElementAt(i);
+      }
+    }
+  }
+
+  // Prune any unused tiles at the end of the store.
+  mImages.RemoveLastElements(mImages.Length() - i);
+
+  // Reset tile-store properties.
+  mRows = rows;
+  mColumns = columns;
+  mSize = aSize;
+  mTextureState = Allocated;
+  mCurrentImage = 0;
+}
+
+uint32_t TiledTextureImage::GetTileCount() { return mImages.Length(); }
+
+already_AddRefed<TextureImage> CreateTiledTextureImage(
+    GLContext* aGL, const gfx::IntSize& aSize,
+    TextureImage::ContentType aContentType, TextureImage::Flags aFlags,
+    TextureImage::ImageFormat aImageFormat) {
+  RefPtr<TextureImage> texImage =
+      static_cast<TextureImage*>(new gl::TiledTextureImage(
+          aGL, aSize, aContentType, aFlags, aImageFormat));
+  return texImage.forget();
+}
+
+already_AddRefed<TextureImage> CreateBasicTextureImage(
+    GLContext* aGL, const gfx::IntSize& aSize,
+    TextureImage::ContentType aContentType, GLenum aWrapMode,
+    TextureImage::Flags aFlags) {
+  bool useNearestFilter = aFlags & TextureImage::UseNearestFilter;
+  if (!aGL->MakeCurrent()) {
+    return nullptr;
+  }
+
+  GLuint texture = 0;
+  aGL->fGenTextures(1, &texture);
+
+  ScopedBindTexture bind(aGL, texture);
+
+  GLint texfilter = useNearestFilter ? LOCAL_GL_NEAREST : LOCAL_GL_LINEAR;
+  aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MIN_FILTER,
+                      texfilter);
+  aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_MAG_FILTER,
+                      texfilter);
+  aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_S, aWrapMode);
+  aGL->fTexParameteri(LOCAL_GL_TEXTURE_2D, LOCAL_GL_TEXTURE_WRAP_T, aWrapMode);
+
+  RefPtr<BasicTextureImage> texImage = new BasicTextureImage(
+      texture, aSize, aWrapMode, aContentType, aGL, aFlags);
+  return texImage.forget();
+}
+
+}  // namespace gl
+}  // namespace mozilla