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mutter-performance-source/cogl/cogl-texture.h
Robert Bragg ba02f70961 texture: assert set_region size <= src size 
This improves the documentation for cogl_texture_set_region() and
cogl_texture_set_region_from_bitmap() to explain that the region can't
be larger than the source data and also adds runtime assertions that
such a request isn't made.

Reviewed-by: Neil Roberts <neil@linux.intel.com>
2011-12-06 18:51:56 +00:00

545 lines
18 KiB
C
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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__
#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.
*/
typedef struct _CoglTexture CoglTexture;
#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;
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);
#if defined (COGL_ENABLE_EXPERIMENTAL_API)
#define cogl_texture_new_from_buffer cogl_texture_new_from_buffer_EXP
/**
* cogl_texture_new_from_buffer:
* @buffer: A #CoglPixelBuffer pointer
* @width: width of texture in pixels or 0
* @height: height of texture in pixels or 0
* @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. If 0 is given the row stride will be deduced from
* @width and @format or the stride given by cogl_pixel_buffer_new_for_size()
* @offset: offset in bytes in @buffer from where the texture data starts
*
* Creates a new texture using the buffer specified by @handle. If the buffer
* has been created using cogl_pixel_buffer_new_for_size() it's possible to omit
* the height and width values already specified at creation time.
*
* Return value: A newly created #CoglTexture or %NULL on failure
*
* Since: 1.2
* Stability: Unstable
*/
CoglTexture *
cogl_texture_new_from_buffer (CoglPixelBuffer *buffer,
unsigned int width,
unsigned int height,
CoglTextureFlags flags,
CoglPixelFormat format,
CoglPixelFormat internal_format,
unsigned int rowstride,
unsigned int offset);
#endif
#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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