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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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COGL_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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COGL_END_DECLS
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#endif /* __COGL_SUB_TEXTURE_H */
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