gecko-dev/gfx/gl/GLUploadHelpers.h

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/* -*- 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/. */
#ifndef GLUploadHelpers_h_
#define GLUploadHelpers_h_
#include "GLDefs.h"
#include "mozilla/gfx/Types.h"
#include "nsPoint.h"
#include "nsRegionFwd.h"
namespace mozilla {
namespace gfx {
class DataSourceSurface;
} // namespace gfx
namespace gl {
class GLContext;
/**
* Creates a RGB/RGBA texture (or uses one provided) and uploads the surface
* contents to it within aSrcRect.
*
* aSrcRect.x/y will be uploaded to 0/0 in the texture, and the size
* of the texture with be aSrcRect.width/height.
*
* If an existing texture is passed through aTexture, it is assumed it
* has already been initialised with glTexImage2D (or this function),
* and that its size is equal to or greater than aSrcRect + aDstPoint.
* You can alternatively set the overwrite flag to true and have a new
* texture memory block allocated.
*
* The aDstPoint parameter is ignored if no texture was provided
* or aOverwrite is true.
*
* \param aData Image data to upload.
* \param aDstRegion Region of texture to upload to.
* \param aTexture Texture to use, or 0 to have one created for you.
* \param aOutUploadSize if set, the number of bytes the texture requires will be returned here
* \param aOverwrite Over an existing texture with a new one.
* \param aSrcPoint Offset into aSrc where the region's bound's
* TopLeft() sits.
* \param aPixelBuffer Pass true to upload texture data with an
* offset from the base data (generally for pixel buffer objects),
* otherwise textures are upload with an absolute pointer to the data.
* \param aTextureUnit, the texture unit used temporarily to upload the
* surface. This testure may be overridden, clients should not rely on
* the contents of this texture after this call or even on this
* texture unit being active.
* \return Surface format of this texture.
*/
gfx::SurfaceFormat
UploadImageDataToTexture(GLContext* gl,
unsigned char* aData,
int32_t aStride,
gfx::SurfaceFormat aFormat,
const nsIntRegion& aDstRegion,
GLuint& aTexture,
size_t* aOutUploadSize = nullptr,
bool aNeedInit = false,
bool aPixelBuffer = false,
GLenum aTextureUnit = LOCAL_GL_TEXTURE0,
GLenum aTextureTarget = LOCAL_GL_TEXTURE_2D);
/**
* Convenience wrapper around UploadImageDataToTexture for gfx::DataSourceSurface's.
*/
gfx::SurfaceFormat
UploadSurfaceToTexture(GLContext* gl,
gfx::DataSourceSurface *aSurface,
const nsIntRegion& aDstRegion,
GLuint& aTexture,
size_t* aOutUploadSize = nullptr,
bool aNeedInit = false,
const gfx::IntPoint& aSrcPoint = gfx::IntPoint(0, 0),
bool aPixelBuffer = false,
GLenum aTextureUnit = LOCAL_GL_TEXTURE0,
GLenum aTextureTarget = LOCAL_GL_TEXTURE_2D);
bool CanUploadSubTextures(GLContext* gl);
bool CanUploadNonPowerOfTwo(GLContext* gl);
} // namespace gl
} // namespace mozilla
#endif