1 files changed, 143 insertions, 0 deletions
diff --git a/dom/canvas/TexUnpackBlob.h b/dom/canvas/TexUnpackBlob.h
new file mode 100644
index 0000000000..8d4c472b9a
--- /dev/null
+++ b/dom/canvas/TexUnpackBlob.h
@@ -0,0 +1,143 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef TEX_UNPACK_BLOB_H_
+#define TEX_UNPACK_BLOB_H_
+
+#include "GLContextTypes.h"
+#include "mozilla/RefPtr.h"
+#include "WebGLStrongTypes.h"
+#include "WebGLTypes.h"
+
+#include <memory>
+
+namespace mozilla {
+
+class UniqueBuffer;
+class WebGLContext;
+class WebGLTexture;
+
+namespace dom {
+class Element;
+class HTMLCanvasElement;
+class HTMLVideoElement;
+}  // namespace dom
+
+namespace gfx {
+class DataSourceSurface;
+}  // namespace gfx
+
+namespace layers {
+class Image;
+class ImageContainer;
+}  // namespace layers
+
+bool IsTarget3D(TexImageTarget target);
+
+namespace webgl {
+
+struct PackingInfo;
+struct DriverUnpackInfo;
+
+Maybe<std::string> BlitPreventReason(int32_t level, const ivec3& offset,
+                                     const webgl::PackingInfo&,
+                                     const TexUnpackBlobDesc&);
+
+class TexUnpackBlob {
+ public:
+  const TexUnpackBlobDesc& mDesc;
+  bool mNeedsExactUpload = true;
+
+  static std::unique_ptr<TexUnpackBlob> Create(const TexUnpackBlobDesc&);
+
+ protected:
+  explicit TexUnpackBlob(const TexUnpackBlobDesc& desc) : mDesc(desc) {
+    MOZ_ASSERT_IF(!IsTarget3D(mDesc.imageTarget), mDesc.size.z == 1);
+  }
+
+ public:
+  virtual ~TexUnpackBlob() = default;
+
+ protected:
+  bool ConvertIfNeeded(const WebGLContext*, const uint32_t rowLength,
+                       const uint32_t rowCount, WebGLTexelFormat srcFormat,
+                       const uint8_t* const srcBegin, const ptrdiff_t srcStride,
+                       WebGLTexelFormat dstFormat, const ptrdiff_t dstStride,
+
+                       const uint8_t** const out_begin,
+                       UniqueBuffer* const out_anchoredBuffer) const;
+
+ public:
+  virtual bool HasData() const { return true; }
+
+  virtual bool Validate(const WebGLContext*, const webgl::PackingInfo& pi) = 0;
+
+  // Returns false when we've generated a WebGL error.
+  // Returns true but with a non-zero *out_error if we still need to generate a
+  // WebGL error.
+  virtual bool TexOrSubImage(bool isSubImage, bool needsRespec,
+                             WebGLTexture* tex, GLint level,
+                             const webgl::DriverUnpackInfo* dui, GLint xOffset,
+                             GLint yOffset, GLint zOffset,
+                             const webgl::PackingInfo& pi,
+                             GLenum* const out_error) const = 0;
+};
+
+class TexUnpackBytes final : public TexUnpackBlob {
+ public:
+  explicit TexUnpackBytes(const TexUnpackBlobDesc& desc) : TexUnpackBlob(desc) {
+    MOZ_ASSERT(mDesc.srcAlphaType == gfxAlphaType::NonPremult);
+  }
+
+  virtual bool HasData() const override {
+    return mDesc.pboOffset || mDesc.cpuData;
+  }
+
+  virtual bool Validate(const WebGLContext*,
+                        const webgl::PackingInfo& pi) override;
+  virtual bool TexOrSubImage(bool isSubImage, bool needsRespec,
+                             WebGLTexture* tex, GLint level,
+                             const webgl::DriverUnpackInfo* dui, GLint xOffset,
+                             GLint yOffset, GLint zOffset,
+                             const webgl::PackingInfo& pi,
+                             GLenum* const out_error) const override;
+};
+
+class TexUnpackImage final : public TexUnpackBlob {
+ public:
+  explicit TexUnpackImage(const TexUnpackBlobDesc& desc)
+      : TexUnpackBlob(desc) {}
+  ~TexUnpackImage();  // Prevent needing to define layers::Image in the header.
+
+  virtual bool Validate(const WebGLContext*,
+                        const webgl::PackingInfo& pi) override;
+  virtual bool TexOrSubImage(bool isSubImage, bool needsRespec,
+                             WebGLTexture* tex, GLint level,
+                             const webgl::DriverUnpackInfo* dui, GLint xOffset,
+                             GLint yOffset, GLint zOffset,
+                             const webgl::PackingInfo& dstPI,
+                             GLenum* const out_error) const override;
+};
+
+class TexUnpackSurface final : public TexUnpackBlob {
+ public:
+  explicit TexUnpackSurface(const TexUnpackBlobDesc& desc)
+      : TexUnpackBlob(desc) {}
+  ~TexUnpackSurface();
+
+  virtual bool Validate(const WebGLContext*,
+                        const webgl::PackingInfo& pi) override;
+  virtual bool TexOrSubImage(bool isSubImage, bool needsRespec,
+                             WebGLTexture* tex, GLint level,
+                             const webgl::DriverUnpackInfo* dui, GLint xOffset,
+                             GLint yOffset, GLint zOffset,
+                             const webgl::PackingInfo& dstPI,
+                             GLenum* const out_error) const override;
+};
+
+}  // namespace webgl
+}  // namespace mozilla
+
+#endif  // TEX_UNPACK_BLOB_H_