The Tor Browser: gfx/gl/GLTextureImage.cpp@b8a032363ba2 (annotated)

gfx/gl/GLTextureImage.cpp@b8a032363ba2 (annotated)

gfx/gl/GLTextureImage.cpp

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* -*- Mode: c++; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40; -*- */
 /* 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 "ScopedGLHelpers.h"
 #include "GLUploadHelpers.h"
 #include "TextureImageEGL.h"
 #ifdef XP_MACOSX
 #include "TextureImageCGL.h"
 #endif
 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)
 {
     switch (gl->GetContextType()) {
 #ifdef XP_MACOSX
         case GLContextType::CGL:
             return CreateTextureImageCGL(gl, aSize, aContentType, aWrapMode, aFlags, aImageFormat);
 #endif
         case GLContextType::EGL:
             return CreateTextureImageEGL(gl, aSize, aContentType, aWrapMode, aFlags, aImageFormat);
         default:
             return CreateBasicTextureImage(gl, aSize, aContentType, aWrapMode, aFlags, aImageFormat);
     }
 }
 static already_AddRefed<TextureImage>
 TileGenFunc(GLContext* gl,
             const nsIntSize& aSize,
             TextureImage::ContentType aContentType,
             TextureImage::Flags aFlags,
             TextureImage::ImageFormat aImageFormat)
 {
     switch (gl->GetContextType()) {
 #ifdef XP_MACOSX
         case GLContextType::CGL:
             return TileGenFuncCGL(gl, aSize, aContentType, aFlags, aImageFormat);
 #endif
         case GLContextType::EGL:
             return TileGenFuncEGL(gl, aSize, aContentType, aFlags, aImageFormat);
         default:
             return nullptr;
     }
 }
 already_AddRefed<TextureImage>
 TextureImage::Create(GLContext* gl,
                      const nsIntSize& size,
                      TextureImage::ContentType contentType,
                      GLenum wrapMode,
                      TextureImage::Flags flags)
 {
     return Create(gl, size.ToIntSize(), contentType, wrapMode, flags);
 }
 // Moz2D equivalent...
 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* aSrcPoint)
 {
     nsIntRegion destRegion = aDestRegion ? *aDestRegion
                                          : nsIntRect(0, 0,
                                                      aSurface->GetSize().width,
                                                      aSurface->GetSize().height);
     gfx::IntPoint srcPoint = aSrcPoint ? *aSrcPoint
                                        : gfx::IntPoint(0, 0);
     return DirectUpdate(aSurface, destRegion, srcPoint);
 }
 gfx::IntRect TextureImage::GetTileRect() {
     return gfx::IntRect(gfx::IntPoint(0,0), mSize);
 }
 gfx::IntRect TextureImage::GetSrcTileRect() {
     return GetTileRect();
 }
 BasicTextureImage::~BasicTextureImage()
 {
     GLContext *ctx = mGLContext;
     if (ctx->IsDestroyed() || !ctx->IsOwningThreadCurrent()) {
         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);
     }
 }
 gfx::DrawTarget*
 BasicTextureImage::BeginUpdate(nsIntRegion& aRegion)
 {
     NS_ASSERTION(!mUpdateDrawTarget, "BeginUpdate() without EndUpdate()?");
     // determine the region the client will need to repaint
     if (CanUploadSubTextures(mGLContext)) {
         GetUpdateRegion(aRegion);
     } else {
         aRegion = nsIntRect(nsIntPoint(0, 0), gfx::ThebesIntSize(mSize));
     }
     mUpdateRegion = aRegion;
     nsIntRect rgnSize = mUpdateRegion.GetBounds();
     if (!nsIntRect(nsIntPoint(0, 0), gfx::ThebesIntSize(mSize)).Contains(rgnSize)) {
         NS_ERROR("update outside of image");
         return nullptr;
     }
     gfx::SurfaceFormat format =
         (GetContentType() == gfxContentType::COLOR) ?
         gfx::SurfaceFormat::B8G8R8X8 : gfx::SurfaceFormat::B8G8R8A8;
     mUpdateDrawTarget =
         GetDrawTargetForUpdate(gfx::IntSize(rgnSize.width, rgnSize.height), format);
     return mUpdateDrawTarget;
 }
 void
 BasicTextureImage::GetUpdateRegion(nsIntRegion& aForRegion)
 {
   // if the texture hasn't been initialized yet, or something important
   // changed, we need to recreate our backing surface and force the
   // client to paint everything
   if (mTextureState != Valid)
       aForRegion = nsIntRect(nsIntPoint(0, 0), gfx::ThebesIntSize(mSize));
 }
 void
 BasicTextureImage::EndUpdate()
 {
     NS_ASSERTION(!!mUpdateDrawTarget, "EndUpdate() without BeginUpdate()?");
     // FIXME: this is the slow boat.  Make me fast (with GLXPixmap?).
     RefPtr<gfx::SourceSurface> updateSnapshot = mUpdateDrawTarget->Snapshot();
     RefPtr<gfx::DataSourceSurface> updateData = updateSnapshot->GetDataSurface();
     bool relative = FinishedSurfaceUpdate();
     mTextureFormat =
         UploadSurfaceToTexture(mGLContext,
                                updateData,
                                mUpdateRegion,
                                mTexture,
                                mTextureState == Created,
                                mUpdateOffset,
                                relative);
     FinishedSurfaceUpload();
     mUpdateDrawTarget = nullptr;
     mTextureState = Valid;
 }
 void
 BasicTextureImage::BindTexture(GLenum aTextureUnit)
 {
     mGLContext->fActiveTexture(aTextureUnit);
     mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, mTexture);
     mGLContext->fActiveTexture(LOCAL_GL_TEXTURE0);
 }
 TemporaryRef<gfx::DrawTarget>
 BasicTextureImage::GetDrawTargetForUpdate(const gfx::IntSize& aSize, gfx::SurfaceFormat aFmt)
 {
     return gfx::Factory::CreateDrawTarget(gfx::BackendType::CAIRO, aSize, aFmt);
 }
 bool
 BasicTextureImage::FinishedSurfaceUpdate()
 {
     return false;
 }
 void
 BasicTextureImage::FinishedSurfaceUpload()
 {
 }
 bool
 BasicTextureImage::DirectUpdate(gfx::DataSourceSurface* aSurf, const nsIntRegion& aRegion, const gfx::IntPoint& aFrom /* = gfx::IntPoint(0, 0) */)
 {
     nsIntRect bounds = aRegion.GetBounds();
     nsIntRegion region;
     if (mTextureState != Valid) {
         bounds = nsIntRect(0, 0, mSize.width, mSize.height);
         region = nsIntRegion(bounds);
     } else {
         region = aRegion;
     }
     mTextureFormat =
         UploadSurfaceToTexture(mGLContext,
                                aSurf,
                                region,
                                mTexture,
                                mTextureState == Created,
                                bounds.TopLeft() + nsIntPoint(aFrom.x, aFrom.y),
                                false);
     mTextureState = Valid;
     return true;
 }
 void
 BasicTextureImage::Resize(const gfx::IntSize& aSize)
 {
     NS_ASSERTION(!mUpdateDrawTarget, "Resize() while in update?");
     mGLContext->fBindTexture(LOCAL_GL_TEXTURE_2D, mTexture);
     mGLContext->fTexImage2D(LOCAL_GL_TEXTURE_2D,
 ,
                             LOCAL_GL_RGBA,
                             aSize.width,
                             aSize.height,
 ,
                             LOCAL_GL_RGBA,
                             LOCAL_GL_UNSIGNED_BYTE,
                             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)
     , mFilter(GraphicsFilter::FILTER_GOOD)
     , mFlags(aFlags)
 {}
 BasicTextureImage::BasicTextureImage(GLuint aTexture,
                                      const nsIntSize& aSize,
                                      GLenum aWrapMode,
                                      ContentType aContentType,
                                      GLContext* aContext,
                                      TextureImage::Flags aFlags /* = TextureImage::NoFlags */,
                                      TextureImage::ImageFormat aImageFormat /* = gfxImageFormat::Unknown */)
     : TextureImage(aSize, aWrapMode, aContentType, aFlags, aImageFormat)
     , mTexture(aTexture)
     , mTextureState(Created)
     , mGLContext(aContext)
     , mUpdateOffset(0, 0)
 {
 }
 BasicTextureImage::BasicTextureImage(GLuint aTexture,
                   const gfx::IntSize& aSize,
                   GLenum aWrapMode,
                   ContentType aContentType,
                   GLContext* aContext,
                   TextureImage::Flags aFlags,
                   TextureImage::ImageFormat aImageFormat)
   : TextureImage(ThebesIntSize(aSize), aWrapMode, aContentType, aFlags, aImageFormat)
   , mTexture(aTexture)
   , mTextureState(Created)
   , mGLContext(aContext)
   , mUpdateOffset(0, 0)
 {}
 static bool
 WantsSmallTiles(GLContext* gl)
 {
     // We must use small tiles for good performance if we can't use
     // glTexSubImage2D() for some reason.
     if (!CanUploadSubTextures(gl))
         return true;
     // 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;
     // 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)
     , mInUpdate(false)
     , 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()
 {
 }
 bool
 TiledTextureImage::DirectUpdate(gfx::DataSourceSurface* aSurf, const nsIntRegion& aRegion, const gfx::IntPoint& aFrom /* = gfx::IntPoint(0, 0) */)
 {
     if (mSize.width == 0 || mSize.height == 0) {
         return true;
     }
     nsIntRegion region;
     if (mTextureState != Valid) {
         nsIntRect bounds = nsIntRect(0, 0, mSize.width, mSize.height);
         region = nsIntRegion(bounds);
     } else {
         region = aRegion;
     }
     bool result = true;
     int oldCurrentImage = mCurrentImage;
     BeginTileIteration();
     do {
         nsIntRect tileRect = ThebesIntRect(GetSrcTileRect());
         int xPos = tileRect.x;
         int yPos = tileRect.y;
         nsIntRegion tileRegion;
         tileRegion.And(region, tileRect); // intersect with tile
         if (tileRegion.IsEmpty())
             continue;
         if (CanUploadSubTextures(mGL)) {
           tileRegion.MoveBy(-xPos, -yPos); // translate into tile local space
         } else {
           // If sub-textures are unsupported, expand to tile boundaries
           tileRect.x = tileRect.y = 0;
           tileRegion = nsIntRegion(tileRect);
         }
         result &= mImages[mCurrentImage]->
           DirectUpdate(aSurf, tileRegion, aFrom + 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::GetUpdateRegion(nsIntRegion& aForRegion)
 {
     if (mTextureState != Valid) {
         // if the texture hasn't been initialized yet, or something important
         // changed, we need to recreate our backing surface and force the
         // client to paint everything
         aForRegion = nsIntRect(nsIntPoint(0, 0), gfx::ThebesIntSize(mSize));
         return;
     }
     nsIntRegion newRegion;
     // We need to query each texture with the region it will be drawing and
     // set aForRegion to be the combination of all of these regions
     for (unsigned i = 0; i < mImages.Length(); i++) {
         int xPos = (i % mColumns) * mTileSize;
         int yPos = (i / mColumns) * mTileSize;
         nsIntRect imageRect = nsIntRect(nsIntPoint(xPos,yPos),
                                         ThebesIntSize(mImages[i]->GetSize()));
         if (aForRegion.Intersects(imageRect)) {
             // Make a copy of the region
             nsIntRegion subRegion;
             subRegion.And(aForRegion, imageRect);
             // Translate it into tile-space
             subRegion.MoveBy(-xPos, -yPos);
             // Query region
             mImages[i]->GetUpdateRegion(subRegion);
             // Translate back
             subRegion.MoveBy(xPos, yPos);
             // Add to the accumulated region
             newRegion.Or(newRegion, subRegion);
         }
     }
     aForRegion = newRegion;
 }
 gfx::DrawTarget*
 TiledTextureImage::BeginUpdate(nsIntRegion& aRegion)
 {
     NS_ASSERTION(!mInUpdate, "nested update");
     mInUpdate = true;
     // Note, we don't call GetUpdateRegion here as if the updated region is
     // fully contained in a single tile, we get to avoid iterating through
     // the tiles again (and a little copying).
     if (mTextureState != Valid)
     {
         // if the texture hasn't been initialized yet, or something important
         // changed, we need to recreate our backing surface and force the
         // client to paint everything
         aRegion = nsIntRect(nsIntPoint(0, 0), gfx::ThebesIntSize(mSize));
     }
     nsIntRect bounds = aRegion.GetBounds();
     for (unsigned i = 0; i < mImages.Length(); i++) {
         int xPos = (i % mColumns) * mTileSize;
         int yPos = (i / mColumns) * mTileSize;
         nsIntRegion imageRegion =
           nsIntRegion(nsIntRect(nsIntPoint(xPos,yPos),
                                 ThebesIntSize(mImages[i]->GetSize())));
         // a single Image can handle this update request
         if (imageRegion.Contains(aRegion)) {
             // adjust for tile offset
             aRegion.MoveBy(-xPos, -yPos);
             // forward the actual call
             RefPtr<gfx::DrawTarget> drawTarget = mImages[i]->BeginUpdate(aRegion);
             // caller expects container space
             aRegion.MoveBy(xPos, yPos);
             // we don't have a temp surface
             mUpdateDrawTarget = nullptr;
             // remember which image to EndUpdate
             mCurrentImage = i;
             return drawTarget.get();
         }
     }
     // Get the real updated region, taking into account the capabilities of
     // each TextureImage tile
     GetUpdateRegion(aRegion);
     mUpdateRegion = aRegion;
     bounds = aRegion.GetBounds();
     // update covers multiple Images - create a temp surface to paint in
     gfx::SurfaceFormat format =
         (GetContentType() == gfxContentType::COLOR) ?
         gfx::SurfaceFormat::B8G8R8X8: gfx::SurfaceFormat::B8G8R8A8;
     mUpdateDrawTarget = gfx::Factory::CreateDrawTarget(gfx::BackendType::CAIRO,
                                                        bounds.Size().ToIntSize(),
                                                        format);
     return mUpdateDrawTarget;;
 }
 void
 TiledTextureImage::EndUpdate()
 {
     NS_ASSERTION(mInUpdate, "EndUpdate not in update");
     if (!mUpdateDrawTarget) { // update was to a single TextureImage
         mImages[mCurrentImage]->EndUpdate();
         mInUpdate = false;
         mTextureState = Valid;
         mTextureFormat = mImages[mCurrentImage]->GetTextureFormat();
         return;
     }
     RefPtr<gfx::SourceSurface> updateSnapshot = mUpdateDrawTarget->Snapshot();
     RefPtr<gfx::DataSourceSurface> updateData = updateSnapshot->GetDataSurface();
     nsRefPtr<gfxASurface> updateSurface = new gfxImageSurface(updateData->GetData(),
                                                               gfx::ThebesIntSize(updateData->GetSize()),
                                                               updateData->Stride(),
                                                               gfx::SurfaceFormatToImageFormat(updateData->GetFormat()));
     // upload tiles from temp surface
     for (unsigned i = 0; i < mImages.Length(); i++) {
         int xPos = (i % mColumns) * mTileSize;
         int yPos = (i / mColumns) * mTileSize;
         nsIntRect imageRect = nsIntRect(nsIntPoint(xPos,yPos),
                                         ThebesIntSize(mImages[i]->GetSize()));
         nsIntRegion subregion;
         subregion.And(mUpdateRegion, imageRect);
         if (subregion.IsEmpty())
             continue;
         subregion.MoveBy(-xPos, -yPos); // Tile-local space
         // copy tile from temp target
         gfx::DrawTarget* drawTarget = mImages[i]->BeginUpdate(subregion);
         nsRefPtr<gfxContext> ctx = new gfxContext(drawTarget);
         gfxUtils::ClipToRegion(ctx, subregion);
         ctx->SetOperator(gfxContext::OPERATOR_SOURCE);
         ctx->SetSource(updateSurface, gfxPoint(-xPos, -yPos));
         ctx->Paint();
         mImages[i]->EndUpdate();
     }
     mUpdateDrawTarget = nullptr;
     mInUpdate = false;
     mTextureFormat = mImages[0]->GetTextureFormat();
     mTextureState = Valid;
 }
 void TiledTextureImage::BeginTileIteration()
 {
     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(TileIterationCallback 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();
     unsigned int srcY = mFlags & 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++) {
             nsIntSize 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.
             nsRefPtr<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.
     unsigned int length = mImages.Length();
     for (; i < length; i++)
       mImages.RemoveElementAt(mImages.Length()-1);
     // Reset tile-store properties.
     mRows = rows;
     mColumns = columns;
     mSize = aSize;
     mTextureState = Allocated;
     mCurrentImage = 0;
 }
 uint32_t TiledTextureImage::GetTileCount()
 {
     return mImages.Length();
 }
 already_AddRefed<TextureImage>
 CreateBasicTextureImage(GLContext* aGL,
                         const gfx::IntSize& aSize,
                         TextureImage::ContentType aContentType,
                         GLenum aWrapMode,
                         TextureImage::Flags aFlags,
                         TextureImage::ImageFormat aImageFormat)
 {
     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);
     nsRefPtr<BasicTextureImage> texImage =
         new BasicTextureImage(texture, aSize, aWrapMode, aContentType,
                               aGL, aFlags, aImageFormat);
     return texImage.forget();
 }
 } // namespace
 } // namespace

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gfx/gl/GLTextureImage.cpp@b8a032363ba2 (annotated)

gfx/gl/GLTextureImage.cpp