gpu: Make glTexSubImage2D work with GL_SRGB_ALPHA on OpenGL

gpu/command_buffer/service/gles2_cmd_decoder.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder.cc b/gpu/command_buffer/service/gles2_cmd_decoder.cc
index 39e0a2954c987119b03744e8848c02faffce1ff9..f25c65f0e1b42467433f4cc6e909577d710b9334 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder.cc
@@ -190,33 +190,6 @@ struct Vec4f {
   GLfloat v[4];
 };
 
-// Returns the union of |rect1| and |rect2| if one of the rectangles is empty,
-// contains the other rectangle or shares an edge with the other rectangle.
-bool CombineAdjacentRects(const gfx::Rect& rect1,
-                          const gfx::Rect& rect2,
-                          gfx::Rect* result) {
-  // Return |rect2| if |rect1| is empty or |rect2| contains |rect1|.
-  if (rect1.IsEmpty() || rect2.Contains(rect1)) {
-    *result = rect2;
-    return true;
-  }
-
-  // Return |rect1| if |rect2| is empty or |rect1| contains |rect2|.
-  if (rect2.IsEmpty() || rect1.Contains(rect2)) {
-    *result = rect1;
-    return true;
-  }
-
-  // Return the union of |rect1| and |rect2| if they share an edge.
-  if (rect1.SharesEdgeWith(rect2)) {
-    *result = gfx::UnionRects(rect1, rect2);
-    return true;
-  }
-
-  // Return false if it's not possible to combine |rect1| and |rect2|.
-  return false;
-}
-
 GLenum ExtractFormatFromStorageFormat(GLenum internalformat) {
   switch (internalformat) {
     case GL_R8:
@@ -11109,9 +11082,9 @@ void GLES2DecoderImpl::DoCopyTexSubImage2D(
   if (xoffset != 0 || yoffset != 0 || width != size.width() ||
       height != size.height()) {
     gfx::Rect cleared_rect;
-    if (CombineAdjacentRects(texture->GetLevelClearedRect(target, level),
-                             gfx::Rect(xoffset, yoffset, width, height),
-                             &cleared_rect)) {
+    if (TextureManager::CombineAdjacentRects(
+            texture->GetLevelClearedRect(target, level),
+            gfx::Rect(xoffset, yoffset, width, height), &cleared_rect)) {
       DCHECK_GE(cleared_rect.size().GetArea(),
                 texture->GetLevelClearedRect(target, level).size().GetArea());
       texture_manager()->SetLevelClearedRect(texture_ref, target, level,
@@ -11165,149 +11138,6 @@ void GLES2DecoderImpl::DoCopyTexSubImage2D(
   ExitCommandProcessingEarly();
 }
 
-bool GLES2DecoderImpl::ValidateTexSubImage2D(
-    error::Error* error,
-    const char* function_name,
-    GLenum target,
-    GLint level,
-    GLint xoffset,
-    GLint yoffset,
-    GLsizei width,
-    GLsizei height,
-    GLenum format,
-    GLenum type,
-    const void * data) {
-  (*error) = error::kNoError;
-  if (!validators_->texture_target.IsValid(target)) {
-    LOCAL_SET_GL_ERROR_INVALID_ENUM(function_name, target, "target");
-    return false;
-  }
-  if (width < 0) {
-    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, function_name, "width < 0");
-    return false;
-  }
-  if (height < 0) {
-    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, function_name, "height < 0");
-    return false;
-  }
-  TextureRef* texture_ref = texture_manager()->GetTextureInfoForTarget(
-      &state_, target);
-  if (!texture_ref) {
-    LOCAL_SET_GL_ERROR(
-        GL_INVALID_OPERATION,
-        function_name, "unknown texture for target");
-    return false;
-  }
-  Texture* texture = texture_ref->texture();
-  GLenum current_type = 0;
-  GLenum internal_format = 0;
-  if (!texture->GetLevelType(target, level, &current_type, &internal_format)) {
-    LOCAL_SET_GL_ERROR(
-        GL_INVALID_OPERATION, function_name, "level does not exist.");
-    return false;
-  }
-  if (!texture_manager()->ValidateTextureParameters(state_.GetErrorState(),
-      function_name, format, type, internal_format, level)) {
-    return false;
-  }
-  if (type != current_type && !feature_info_->IsES3Enabled()) {
-    LOCAL_SET_GL_ERROR(
-        GL_INVALID_OPERATION,
-        function_name, "type does not match type of texture.");
-    return false;
-  }
-  if (!texture->ValidForTexture(
-          target, level, xoffset, yoffset, 0, width, height, 1)) {
-    LOCAL_SET_GL_ERROR(GL_INVALID_VALUE, function_name, "bad dimensions.");
-    return false;
-  }
-  if ((GLES2Util::GetChannelsForFormat(format) &
-       (GLES2Util::kDepth | GLES2Util::kStencil)) != 0
-      && !feature_info_->IsES3Enabled()) {
-    LOCAL_SET_GL_ERROR(
-        GL_INVALID_OPERATION,
-        function_name, "can not supply data for depth or stencil textures");
-    return false;
-  }
-  if (data == NULL) {
-    (*error) = error::kOutOfBounds;
-    return false;
-  }
-  return true;
-}
-
-error::Error GLES2DecoderImpl::DoTexSubImage2D(
-    GLenum target,
-    GLint level,
-    GLint xoffset,
-    GLint yoffset,
-    GLsizei width,
-    GLsizei height,
-    GLenum format,
-    GLenum type,
-    const void * data) {
-  error::Error error = error::kNoError;
-  if (!ValidateTexSubImage2D(&error, "glTexSubImage2D", target, level,
-      xoffset, yoffset, width, height, format, type, data)) {
-    return error;
-  }
-  TextureRef* texture_ref = texture_manager()->GetTextureInfoForTarget(
-      &state_, target);
-  Texture* texture = texture_ref->texture();
-  GLsizei tex_width = 0;
-  GLsizei tex_height = 0;
-  bool ok = texture->GetLevelSize(
-      target, level, &tex_width, &tex_height, nullptr);
-  DCHECK(ok);
-  if (xoffset != 0 || yoffset != 0 ||
-      width != tex_width || height != tex_height) {
-    gfx::Rect cleared_rect;
-    if (CombineAdjacentRects(texture->GetLevelClearedRect(target, level),
-                             gfx::Rect(xoffset, yoffset, width, height),
-                             &cleared_rect)) {
-      DCHECK_GE(cleared_rect.size().GetArea(),
-                texture->GetLevelClearedRect(target, level).size().GetArea());
-      texture_manager()->SetLevelClearedRect(texture_ref, target, level,
-                                             cleared_rect);
-    } else {
-      // Otherwise clear part of texture level that is not already cleared.
-      if (!texture_manager()->ClearTextureLevel(this, texture_ref, target,
-                                                level)) {
-        LOCAL_SET_GL_ERROR(GL_OUT_OF_MEMORY, "glTexSubImage2D",
-                           "dimensions too big");
-        return error::kNoError;
-      }
-    }
-    ScopedTextureUploadTimer timer(&texture_state_);
-    glTexSubImage2D(
-        target, level, xoffset, yoffset, width, height, format, type, data);
-    return error::kNoError;
-  }
-
-  if (!texture_state_.texsubimage_faster_than_teximage &&
-      !texture->IsImmutable() &&
-      !texture->HasImages()) {
-    ScopedTextureUploadTimer timer(&texture_state_);
-    GLenum internal_format;
-    GLenum tex_type;
-    texture->GetLevelType(target, level, &tex_type, &internal_format);
-    // NOTE: In OpenGL ES 2.0 border is always zero. If that changes we'll need
-    // to look it up.
-    glTexImage2D(
-        target, level, internal_format, width, height, 0, format, type, data);
-  } else {
-    ScopedTextureUploadTimer timer(&texture_state_);
-    glTexSubImage2D(
-        target, level, xoffset, yoffset, width, height, format, type, data);
-  }
-  texture_manager()->SetLevelCleared(texture_ref, target, level, true);
-
-  // This may be a slow command.  Exit command processing to allow for
-  // context preemption and GPU watchdog checks.
-  ExitCommandProcessingEarly();
-  return error::kNoError;
-}
-
 error::Error GLES2DecoderImpl::HandleTexSubImage2D(uint32 immediate_data_size,
                                                    const void* cmd_data) {
   const gles2::cmds::TexSubImage2D& c =
@@ -11332,10 +11162,23 @@ error::Error GLES2DecoderImpl::HandleTexSubImage2D(uint32 immediate_data_size,
       NULL, NULL)) {
     return error::kOutOfBounds;
   }
+
   const void* pixels = GetSharedMemoryAs<const void*>(
       c.pixels_shm_id, c.pixels_shm_offset, data_size);
-  return DoTexSubImage2D(
-      target, level, xoffset, yoffset, width, height, format, type, pixels);
+  if (!pixels)
+    return error::kOutOfBounds;
+
+  TextureManager::DoTexSubImageArguments args = {
+      target, level,  xoffset, yoffset, width,
+      height, format, type,    pixels,  data_size};
+  texture_manager()->ValidateAndDoTexSubImage(this, &texture_state_, &state_,
+                                              &framebuffer_state_,
+                                              "glTexSubImage2D", args);
+
+  // This may be a slow command.  Exit command processing to allow for
+  // context preemption and GPU watchdog checks.
+  ExitCommandProcessingEarly();
+  return error::kNoError;
 }
 
 error::Error GLES2DecoderImpl::DoTexSubImage3D(
@@ -13273,9 +13116,9 @@ void GLES2DecoderImpl::DoCopySubTextureCHROMIUM(
   if (xoffset != 0 || yoffset != 0 || width != dest_width ||
       height != dest_height) {
     gfx::Rect cleared_rect;
-    if (CombineAdjacentRects(dest_texture->GetLevelClearedRect(target, 0),
-                             gfx::Rect(xoffset, yoffset, width, height),
-                             &cleared_rect)) {
+    if (TextureManager::CombineAdjacentRects(
+            dest_texture->GetLevelClearedRect(target, 0),
+            gfx::Rect(xoffset, yoffset, width, height), &cleared_rect)) {
       DCHECK_GE(cleared_rect.size().GetArea(),
                 dest_texture->GetLevelClearedRect(target, 0).size().GetArea());
       texture_manager()->SetLevelClearedRect(dest_texture_ref, target, 0,
@@ -13611,9 +13454,9 @@ void GLES2DecoderImpl::DoCompressedCopySubTextureCHROMIUM(GLenum target,
   if (xoffset != 0 || yoffset != 0 || width != dest_width ||
       height != dest_height) {
     gfx::Rect cleared_rect;
-    if (CombineAdjacentRects(dest_texture->GetLevelClearedRect(target, 0),
-                             gfx::Rect(xoffset, yoffset, width, height),
-                             &cleared_rect)) {
+    if (TextureManager::CombineAdjacentRects(
+            dest_texture->GetLevelClearedRect(target, 0),
+            gfx::Rect(xoffset, yoffset, width, height), &cleared_rect)) {
       DCHECK_GE(cleared_rect.size().GetArea(),
                 dest_texture->GetLevelClearedRect(target, 0).size().GetArea());
       texture_manager()->SetLevelClearedRect(dest_texture_ref, target, 0,