Expose Map/UnmapTexSubImage2DCHROMIUM to pepper plugins

ppapi/c/dev/ppb_gles_chromium_texture_mapping_dev.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef PPAPI_C_DEV_PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_
+#define PPAPI_C_DEV_PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_
+
+#include "ppapi/c/pp_resource.h"
+#include "ppapi/c/dev/ppb_opengles_dev.h"
+
+#define PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_INTERFACE "PPB_GLESChromiumTextureMapping(Dev);0.1"
+
+struct PPB_GLESChromiumTextureMapping_Dev {
+  // Maps the sub-image of a texture. 'level', 'xoffset', 'yoffset', 'width',
+  // 'height', 'format' and 'type' correspond to the similarly named parameters
+  // of TexSubImage2D, and define the sub-image region, as well as the format of
+  // the data. 'access' must be one of GL_READ_ONLY, GL_WRITE_ONLY or
+  // GL_READ_WRITE. If READ is included, the returned buffer will contain the
+  // pixel data for the sub-image. If WRITE is included, the pixel data for the
+  // sub-image will be updated to the contents of the buffer when
+  // UnmapTexSubImage2DCHROMIUM is called. NOTE: for a GL_WRITE_ONLY map, it
+  // means that all the values of the buffer must be written.
+  void* (*MapTexSubImage2DCHROMIUM)(
+     PP_Resource context,
+     GLenum target,
+     GLint level,
+     GLint xoffset,
+     GLint yoffset,
+     GLsizei width,
+     GLsizei height,
+     GLenum format,
+     GLenum type,
+     GLenum access);
+
+  // Unmaps the sub-image of a texture. If the sub-image was mapped with one of
+  // the WRITE accesses, the pixels are updated at this time to the contents of
+  // the buffer. 'mem' must be the pointer returned by MapTexSubImage2DCHROMIUM.
+  void (*UnmapTexSubImage2DCHROMIUM)(PP_Resource context, const void* mem);
+};
+
+#endif  // PPAPI_C_DEV_PPB_GLES_CHROMIUM_TEXTURE_MAPPING_DEV_H_