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3a4a858ce3
This macro was introduced so as to be able to be built without GLib. However, this feature was long ago removed, and in Mutter we depend on it anyway, so let's get rid of it in favor of more consistency.
135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/*
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* Cogl
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*
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* A Low Level GPU Graphics and Utilities API
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*
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* Copyright (C) 2010 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy,
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* modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors:
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* Neil Roberts <neil@linux.intel.com>
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(COGL_COMPILATION)
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#error "Only <cogl/cogl.h> can be included directly."
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#endif
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#ifndef __COGL_SUB_TEXTURE_H
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#define __COGL_SUB_TEXTURE_H
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G_BEGIN_DECLS
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/**
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* SECTION:cogl-sub-texture
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* @short_description: Functions for creating and manipulating
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* sub-textures.
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*
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* These functions allow high-level textures to be created that
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* represent a sub-region of another texture. For example these
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* can be used to implement custom texture atlasing schemes.
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*/
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#define COGL_SUB_TEXTURE(tex) ((CoglSubTexture *) tex)
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typedef struct _CoglSubTexture CoglSubTexture;
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/**
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* cogl_sub_texture_get_gtype:
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*
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* Returns: a #GType that can be used with the GLib type system.
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*/
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GType cogl_sub_texture_get_gtype (void);
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/**
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* cogl_sub_texture_new:
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* @ctx: A #CoglContext pointer
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* @parent_texture: The full texture containing a sub-region you want
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* to make a #CoglSubTexture from.
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* @sub_x: The top-left x coordinate of the parent region to make
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* a texture from.
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* @sub_y: The top-left y coordinate of the parent region to make
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* a texture from.
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* @sub_width: The width of the parent region to make a texture from.
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* @sub_height: The height of the parent region to make a texture
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* from.
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*
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* Creates a high-level #CoglSubTexture representing a sub-region of
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* any other #CoglTexture. The sub-region must strictly lye within the
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* bounds of the @parent_texture. The returned texture implements the
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* #CoglMetaTexture interface because it's not a low level texture
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* that hardware can understand natively.
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*
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* <note>Remember: Unless you are using high level drawing APIs such
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* as cogl_rectangle() or other APIs documented to understand the
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* #CoglMetaTexture interface then you need to use the
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* #CoglMetaTexture interface to resolve a #CoglSubTexture into a
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* low-level texture before drawing.</note>
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*
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* Return value: (transfer full): A newly allocated #CoglSubTexture
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* representing a sub-region of @parent_texture.
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*
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* Since: 1.10
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* Stability: unstable
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*/
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CoglSubTexture *
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cogl_sub_texture_new (CoglContext *ctx,
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CoglTexture *parent_texture,
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int sub_x,
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int sub_y,
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int sub_width,
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int sub_height);
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/**
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* cogl_sub_texture_get_parent:
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* @sub_texture: A pointer to a #CoglSubTexture
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*
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* Retrieves the parent texture that @sub_texture derives its content
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* from. This is the texture that was passed to
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* cogl_sub_texture_new() as the parent_texture argument.
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*
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* Return value: (transfer none): The parent texture that @sub_texture
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* derives its content from.
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* Since: 1.10
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* Stability: unstable
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*/
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CoglTexture *
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cogl_sub_texture_get_parent (CoglSubTexture *sub_texture);
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/**
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* cogl_is_sub_texture:
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* @object: a #CoglObject
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*
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* Checks whether @object is a #CoglSubTexture.
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*
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* Return value: %TRUE if the passed @object represents a
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* #CoglSubTexture and %FALSE otherwise.
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*
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* Since: 1.10
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* Stability: unstable
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*/
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CoglBool
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cogl_is_sub_texture (void *object);
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G_END_DECLS
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#endif /* __COGL_SUB_TEXTURE_H */
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