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This exposes 2 experimental functions that make it possible to upload a subregion of a texture from a CoglBuffer by first wrapping the buffer as a CoglBitmap and then allowing uploading of a subregion from a CoglBitmap. The new functions are: cogl_bitmap_new_from_buffer() and cogl_texture_set_region_from_bitmap() Actually for now we are exporting this API for practical reasons since we already had this API internally and it enables a specific feature that was requested, but it is worth nothing that it's quite likely we will replace these with functions that don't involve the CoglBitmap API at some point. For reference: The CoglBitmap API was actually removed from the 2.0 experimental API reference manual some time ago because the hope was that we'd come up with a neater replacement. It doesn't seem entirely clear what the scope of the CoglBitmap api is so it has became a bit of a dumping ground. CoglBitmap is used for image loading, as a means to represent the layout of image data and also internally deals with format conversions. Note: Because we are avoiding including CoglBitmap as part of the 2.0 API these functions aren't currently included in the 2.0 reference manual. Reviewed-by: Neil Roberts <neil@linux.intel.com>
164 lines
4.5 KiB
C
164 lines
4.5 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2007,2008,2009 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_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_BITMAP_H__
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#define __COGL_BITMAP_H__
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#include <cogl/cogl-types.h>
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#include <cogl/cogl-buffer.h>
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G_BEGIN_DECLS
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typedef struct _CoglBitmap CoglBitmap;
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/**
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* SECTION:cogl-bitmap
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* @short_description: Fuctions for loading images
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*
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* Cogl allows loading image data into memory as CoglBitmaps without
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* loading them immediately into GPU textures.
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*
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* #CoglBitmap is available since Cogl 1.0
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*/
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/**
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* cogl_bitmap_new_from_file:
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* @filename: the file to load.
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* @error: a #GError or %NULL.
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*
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* Loads an image file from disk. This function can be safely called from
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* within a thread.
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*
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* Return value: a #CoglBitmap to the new loaded image data, or
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* %NULL if loading the image failed.
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*
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* Since: 1.0
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*/
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CoglBitmap *
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cogl_bitmap_new_from_file (const char *filename,
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GError **error);
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#if defined (COGL_ENABLE_EXPERIMENTAL_API)
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#define cogl_bitmap_new_from_buffer cogl_bitmap_new_from_buffer_EXP
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/**
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* cogl_bitmap_new_from_buffer:
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* @buffer: A #CoglBuffer containing image data
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* @format: The #CoglPixelFormat defining the format of the image data
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* in the given @buffer.
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* @width: The width of the image data in the given @buffer.
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* @height: The height of the image data in the given @buffer.
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* @rowstride: The rowstride in bytes of the image data in the given @buffer.
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* @offset: The offset into the given @buffer to the first pixel that
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* should be considered part of the #CoglBitmap.
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*
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* Wraps some image data that has been uploaded into a #CoglBuffer as
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* a #CoglBitmap. The data is not copied in this process.
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*
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* Return value: a #CoglBitmap encapsulating the given @buffer.
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*
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* Since: 1.8
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* Stability: unstable
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*/
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CoglBitmap *
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cogl_bitmap_new_from_buffer (CoglBuffer *buffer,
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CoglPixelFormat format,
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int width,
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int height,
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int rowstride,
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int offset);
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#endif
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/**
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* cogl_bitmap_get_size_from_file:
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* @filename: the file to check
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* @width: (out): return location for the bitmap width, or %NULL
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* @height: (out): return location for the bitmap height, or %NULL
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*
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* Parses an image file enough to extract the width and height
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* of the bitmap.
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*
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* Return value: %TRUE if the image was successfully parsed
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*
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* Since: 1.0
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*/
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gboolean
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cogl_bitmap_get_size_from_file (const char *filename,
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int *width,
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int *height);
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/**
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* cogl_is_bitmap:
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* @handle: a #CoglHandle for a bitmap
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*
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* Checks whether @handle is a #CoglHandle for a bitmap
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*
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* Return value: %TRUE if the passed handle represents a bitmap,
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* and %FALSE otherwise
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*
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* Since: 1.0
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*/
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gboolean
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cogl_is_bitmap (CoglHandle handle);
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/**
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* COGL_BITMAP_ERROR:
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*
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* #GError domain for bitmap errors.
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*
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* Since: 1.4
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*/
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#define COGL_BITMAP_ERROR (cogl_bitmap_error_quark ())
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/**
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* CoglBitmapError:
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* @COGL_BITMAP_ERROR_FAILED: Generic failure code, something went
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* wrong.
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* @COGL_BITMAP_ERROR_UNKNOWN_TYPE: Unknown image type.
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* @COGL_BITMAP_ERROR_CORRUPT_IMAGE: An image file was broken somehow.
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*
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* Error codes that can be thrown when performing bitmap
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* operations. Note that gdk_pixbuf_new_from_file() can also throw
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* errors directly from the underlying image loading library. For
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* example, if GdkPixbuf is used then errors #GdkPixbufError<!-- -->s
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* will be used directly.
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*
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* Since: 1.4
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*/
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typedef enum {
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COGL_BITMAP_ERROR_FAILED,
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COGL_BITMAP_ERROR_UNKNOWN_TYPE,
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COGL_BITMAP_ERROR_CORRUPT_IMAGE
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} CoglBitmapError;
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GQuark cogl_bitmap_error_quark (void);
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G_END_DECLS
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#endif /* __COGL_BITMAP_H__ */
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