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mutter/cogl/cogl-texture.h
Neil Roberts 3700cc26a5 Change API so that CoglPixelBuffer no longer knows its w/h/format 
The idea is that CoglPixelBuffer should just be a buffer that can be
used for pixel data and it has no idea about the details of any images
that are stored in it. This is analogous to CoglAttributeBuffer which
itself does not have any information about the attributes. When you
want to use a pixel buffer you should create a CoglBitmap which points
to a region of the attribute buffer and provides the extra needed
information such as the width, height and format. That way it is also
possible to use a single CoglPixelBuffer with multiple bitmaps.

The changes that are made are:

• cogl_pixel_buffer_new_with_size has been removed and in its place is
  cogl_bitmap_new_with_size. This will create a pixel buffer at the
  right size and rowstride for the given width/height/format and
  immediately create a single CoglBitmap to point into it. The old
  function had an out-parameter for the stride of the image but with
  the new API this should be queriable from the bitmap (although there
  is no function for this yet).

• There is now a public cogl_pixel_buffer_new constructor. This takes
  a size in bytes and data pointer similarly to
  cogl_attribute_buffer_new.

• cogl_texture_new_from_buffer has been removed. If you want to create
  a texture from a pixel buffer you should wrap it up in a bitmap
  first. There is already API to create a texture from a bitmap.

This patch also does a bit of header juggling because cogl-context.h
was including cogl-texture.h and cogl-framebuffer.h which were causing
some circular dependencies when cogl-bitmap.h includes cogl-context.h.
These weren't actually needed in cogl-context.h itself but a few other
headers were relying on them being included so this adds the #includes
where necessary.

Reviewed-by: Robert Bragg <robert@linux.intel.com>
2012-03-05 18:47:45 +00:00

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009,2010 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
*/
#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_TEXTURE_H__
#define __COGL_TEXTURE_H__
/* We forward declare the CoglTexture type here to avoid some circular
* dependency issues with the following headers.
*/
typedef struct _CoglTexture CoglTexture;
#include <cogl/cogl-types.h>
#include <cogl/cogl-defines.h>
#if defined (COGL_ENABLE_EXPERIMENTAL_API)
#include <cogl/cogl-pixel-buffer.h>
#endif
#include <cogl/cogl-bitmap.h>
G_BEGIN_DECLS
/**
* SECTION:cogl-texture
* @short_description: Fuctions for creating and manipulating textures
*
* Cogl allows creating and manipulating textures using a uniform
* API that tries to hide all the various complexities of creating,
* loading and manipulating textures.
*/
#define COGL_TEXTURE(X) ((CoglTexture *)X)
#define COGL_TEXTURE_MAX_WASTE 127
/**
* COGL_TEXTURE_ERROR:
*
* #GError domain for texture errors.
*
* Since: 2.0
* Stability: Unstable
*/
#define COGL_TEXTURE_ERROR (cogl_texture_error_quark ())
/**
* CoglTextureError:
* @COGL_TEXTURE_ERROR_SIZE: Unsupported size
*
* Error codes that can be thrown when allocating textures.
*
* Since: 2.0
* Stability: Unstable
*/
typedef enum {
COGL_TEXTURE_ERROR_SIZE,
COGL_TEXTURE_ERROR_FORMAT,
COGL_TEXTURE_ERROR_BAD_PARAMETER,
COGL_TEXTURE_ERROR_TYPE
} CoglTextureError;
/**
* CoglTextureType:
* @COGL_TEXTURE_TYPE_2D: A #CoglTexture2D
* @COGL_TEXTURE_TYPE_3D: A #CoglTexture3D
* @COGL_TEXTURE_TYPE_RECTANGLE: A #CoglTextureRectangle
*
* Constants representing the underlying hardware texture type of a
* #CoglTexture.
*
* Stability: unstable
* Since: 1.10
*/
typedef enum {
COGL_TEXTURE_TYPE_2D,
COGL_TEXTURE_TYPE_3D,
COGL_TEXTURE_TYPE_RECTANGLE
} CoglTextureType;
GQuark cogl_texture_error_quark (void);
/**
* cogl_texture_new_with_size:
* @width: width of texture in pixels.
* @height: height of texture in pixels.
* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture.
*
* Creates a new #CoglTexture with the specified dimensions and pixel format.
*
* Return value: A newly created #CoglTexture or %NULL on failure
*
* Since: 0.8
*/
CoglTexture *
cogl_texture_new_with_size (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat internal_format);
/**
* cogl_texture_new_from_file:
* @filename: the file to load
* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture. If %COGL_PIXEL_FORMAT_ANY is given then a premultiplied
* format similar to the format of the source data will be used. The
* default blending equations of Cogl expect premultiplied color data;
* the main use of passing a non-premultiplied format here is if you
* have non-premultiplied source data and are going to adjust the blend
* mode (see cogl_material_set_blend()) or use the data for something
* other than straight blending.
* @error: return location for a #GError or %NULL
*
* Creates a #CoglTexture from an image file.
*
* Return value: A newly created #CoglTexture or %NULL on failure
*
* Since: 0.8
*/
CoglTexture *
cogl_texture_new_from_file (const char *filename,
CoglTextureFlags flags,
CoglPixelFormat internal_format,
GError **error);
/**
* cogl_texture_new_from_data:
* @width: width of texture in pixels
* @height: height of texture in pixels
* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
* @format: the #CoglPixelFormat the buffer is stored in in RAM
* @internal_format: the #CoglPixelFormat that will be used for storing
* the buffer on the GPU. If COGL_PIXEL_FORMAT_ANY is given then a
* premultiplied format similar to the format of the source data will
* be used. The default blending equations of Cogl expect premultiplied
* color data; the main use of passing a non-premultiplied format here
* is if you have non-premultiplied source data and are going to adjust
* the blend mode (see cogl_material_set_blend()) or use the data for
* something other than straight blending.
* @rowstride: the memory offset in bytes between the starts of
* scanlines in @data
* @data: pointer the memory region where the source buffer resides
*
* Creates a new #CoglTexture based on data residing in memory.
*
* Return value: A newly created #CoglTexture or %NULL on failure
*
* Since: 0.8
*/
CoglTexture *
cogl_texture_new_from_data (unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
unsigned int rowstride,
const guint8 *data);
/**
* cogl_texture_new_from_foreign:
* @gl_handle: opengl handle of foreign texture.
* @gl_target: opengl target type of foreign texture
* @width: width of foreign texture
* @height: height of foreign texture.
* @x_pot_waste: horizontal waste on the right hand edge of the texture.
* @y_pot_waste: vertical waste on the bottom edge of the texture.
* @format: format of the foreign texture.
*
* Creates a #CoglTexture based on an existing OpenGL texture; the
* width, height and format are passed along since it is not always
* possible to query these from OpenGL.
*
* The waste arguments allow you to create a Cogl texture that maps to
* a region smaller than the real OpenGL texture. For instance if your
* hardware only supports power-of-two textures you may load a
* non-power-of-two image into a larger power-of-two texture and use
* the waste arguments to tell Cogl which region should be mapped to
* the texture coordinate range [0:1].
*
* Return value: A newly created #CoglTexture or %NULL on failure
*
* Since: 0.8
*/
CoglTexture *
cogl_texture_new_from_foreign (GLuint gl_handle,
GLenum gl_target,
GLuint width,
GLuint height,
GLuint x_pot_waste,
GLuint y_pot_waste,
CoglPixelFormat format);
/**
* cogl_texture_new_from_bitmap:
* @bitmap: A #CoglBitmap pointer
* @flags: Optional flags for the texture, or %COGL_TEXTURE_NONE
* @internal_format: the #CoglPixelFormat to use for the GPU storage of the
* texture
*
* Creates a #CoglTexture from a #CoglBitmap.
*
* Return value: A newly created #CoglTexture or %NULL on failure
*
* Since: 1.0
*/
CoglTexture *
cogl_texture_new_from_bitmap (CoglBitmap *bitmap,
CoglTextureFlags flags,
CoglPixelFormat internal_format);
/**
* cogl_is_texture:
* @object: A #CoglObject pointer
*
* Gets whether the given object references a texture object.
*
* Return value: %TRUE if the handle references a texture, and
* %FALSE otherwise
*/
gboolean
cogl_is_texture (void *object);
/**
* cogl_texture_get_width:
* @texture a #CoglTexture pointer.
*
* Queries the width of a cogl texture.
*
* Return value: the width of the GPU side texture in pixels
*/
unsigned int
cogl_texture_get_width (CoglTexture *texture);
/**
* cogl_texture_get_height:
* @texture a #CoglTexture pointer.
*
* Queries the height of a cogl texture.
*
* Return value: the height of the GPU side texture in pixels
*/
unsigned int
cogl_texture_get_height (CoglTexture *texture);
/**
* cogl_texture_get_format:
* @texture a #CoglTexture pointer.
*
* Queries the #CoglPixelFormat of a cogl texture.
*
* Return value: the #CoglPixelFormat of the GPU side texture
*/
CoglPixelFormat
cogl_texture_get_format (CoglTexture *texture);
/**
* cogl_texture_get_rowstride:
* @texture a #CoglTexture pointer.
*
* Determines the bytes-per-pixel for the #CoglPixelFormat retrieved
* from cogl_texture_get_format() and multiplies that by the texture's
* width.
*
* <note>It's very unlikely that anyone would need to use this API to
* query the internal rowstride of a #CoglTexture which can just be
* considered an implementation detail. Actually it's not even useful
* internally since underlying drivers are free to use a different
* format</note>
*
* </note>This API is only here for backwards compatibility and
* shouldn't be used in new code. In particular please don't be
* mislead to pass the returned value to cogl_texture_get_data() for
* the rowstride, since you should be passing the rowstride you desire
* for your destination buffer not the rowstride of the source
* texture.</note>
*
* Return value: The bytes-per-pixel for the current format
* multiplied by the texture's width
*
* Deprecated: 1.10: There's no replacement for the API but there's
* also no known need for API either. It was just
* a mistake that it was ever published.
*/
unsigned int
cogl_texture_get_rowstride (CoglTexture *texture);
/**
* cogl_texture_get_max_waste:
* @texture a #CoglTexture pointer.
*
* Queries the maximum wasted (unused) pixels in one dimension of a GPU side
* texture.
*
* Return value: the maximum waste
*/
int
cogl_texture_get_max_waste (CoglTexture *texture);
/**
* cogl_texture_is_sliced:
* @texture a #CoglTexture pointer.
*
* Queries if a texture is sliced (stored as multiple GPU side tecture
* objects).
*
* Return value: %TRUE if the texture is sliced, %FALSE if the texture
* is stored as a single GPU texture
*/
gboolean
cogl_texture_is_sliced (CoglTexture *texture);
/**
* cogl_texture_get_gl_texture:
* @texture a #CoglTexture pointer.
* @out_gl_handle: (out) (allow-none): pointer to return location for the
* textures GL handle, or %NULL.
* @out_gl_target: (out) (allow-none): pointer to return location for the
* GL target type, or %NULL.
*
* Queries the GL handles for a GPU side texture through its #CoglTexture.
*
* If the texture is spliced the data for the first sub texture will be
* queried.
*
* Return value: %TRUE if the handle was successfully retrieved, %FALSE
* if the handle was invalid
*/
gboolean
cogl_texture_get_gl_texture (CoglTexture *texture,
GLuint *out_gl_handle,
GLenum *out_gl_target);
/**
* cogl_texture_get_data:
* @texture a #CoglTexture pointer.
* @format: the #CoglPixelFormat to store the texture as.
* @rowstride: the rowstride of @data in bytes or pass 0 to calculate
* from the bytes-per-pixel of @format multiplied by the
* @texture width.
* @data: memory location to write the @texture's contents, or %NULL
* to only query the data size through the return value.
*
* Copies the pixel data from a cogl texture to system memory.
*
* <note>Don't pass the value of cogl_texture_get_rowstride() as the
* @rowstride argument, the rowstride should be the rowstride you
* want for the destination @data buffer not the rowstride of the
* source texture</note>
*
* Return value: the size of the texture data in bytes
*/
int
cogl_texture_get_data (CoglTexture *texture,
CoglPixelFormat format,
unsigned int rowstride,
guint8 *data);
/**
* cogl_texture_set_region:
* @texture a #CoglTexture.
* @src_x: upper left coordinate to use from source data.
* @src_y: upper left coordinate to use from source data.
* @dst_x: upper left destination horizontal coordinate.
* @dst_y: upper left destination vertical coordinate.
* @dst_width: width of destination region to write. (Must be less
* than or equal to @width)
* @dst_height: height of destination region to write. (Must be less
* than or equal to @height)
* @width: width of source data buffer.
* @height: height of source data buffer.
* @format: the #CoglPixelFormat used in the source buffer.
* @rowstride: rowstride of source buffer (computed from width if none
* specified)
* @data: the actual pixel data.
*
* Sets the pixels in a rectangular subregion of @texture from an in-memory
* buffer containing pixel data.
*
* <note>The region set can't be larger than the source @data</note>
*
* Return value: %TRUE if the subregion upload was successful, and
* %FALSE otherwise
*/
gboolean
cogl_texture_set_region (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
int width,
int height,
CoglPixelFormat format,
unsigned int rowstride,
const guint8 *data);
#if defined (COGL_ENABLE_EXPERIMENTAL_API)
#define cogl_texture_set_region_from_bitmap \
cogl_texture_set_region_from_bitmap_EXP
/**
* cogl_texture_set_region_from_bitmap:
* @texture a #CoglTexture pointer
* @src_x: upper left coordinate to use from the source bitmap.
* @src_y: upper left coordinate to use from the source bitmap
* @dst_x: upper left destination horizontal coordinate.
* @dst_y: upper left destination vertical coordinate.
* @dst_width: width of destination region to write. (Must be less
* than or equal to the bitmap width)
* @dst_height: height of destination region to write. (Must be less
* than or equal to the bitmap height)
* @bitmap: The source bitmap to read from
*
* Copies a specified source region from @bitmap to the position
* (@src_x, @src_y) of the given destination texture @handle.
*
* <note>The region updated can't be larger than the source
* bitmap</note>
*
* Return value: %TRUE if the subregion upload was successful, and
* %FALSE otherwise
*
* Since: 1.8
* Stability: unstable
*/
gboolean
cogl_texture_set_region_from_bitmap (CoglTexture *texture,
int src_x,
int src_y,
int dst_x,
int dst_y,
unsigned int dst_width,
unsigned int dst_height,
CoglBitmap *bitmap);
#endif
/**
* cogl_texture_new_from_sub_texture:
* @full_texture: a #CoglTexture pointer
* @sub_x: X coordinate of the top-left of the subregion
* @sub_y: Y coordinate of the top-left of the subregion
* @sub_width: Width in pixels of the subregion
* @sub_height: Height in pixels of the subregion
*
* Creates a new texture which represents a subregion of another
* texture. The GL resources will be shared so that no new texture
* data is actually allocated.
*
* Sub textures have undefined behaviour texture coordinates outside
* of the range [0,1] are used. They also do not work with
* CoglVertexBuffers.
*
* The sub texture will keep a reference to the full texture so you do
* not need to keep one separately if you only want to use the sub
* texture.
*
* Return value: A newly created #CoglTexture or %NULL on failure
* Since: 1.2
*/
CoglTexture *
cogl_texture_new_from_sub_texture (CoglTexture *full_texture,
int sub_x,
int sub_y,
int sub_width,
int sub_height);
#ifndef COGL_DISABLE_DEPRECATED
/**
* cogl_texture_ref:
* @texture: a #CoglTexture.
*
* Increment the reference count for a cogl texture.
*
* Deprecated: 1.2: Use cogl_object_ref() instead
*
* Return value: the @texture pointer.
*/
void *
cogl_texture_ref (void *texture) G_GNUC_DEPRECATED;
/**
* cogl_texture_unref:
* @texture: a #CoglTexture.
*
* Decrement the reference count for a cogl texture.
*
* Deprecated: 1.2: Use cogl_object_unref() instead
*/
void
cogl_texture_unref (void *texture) G_GNUC_DEPRECATED;
#endif /* COGL_DISABLE_DEPRECATED */
G_END_DECLS
#endif /* __COGL_TEXTURE_H__ */
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