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317 lines
9.2 KiB
C
317 lines
9.2 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(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_BITMAP_H__
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#define __COGL_BITMAP_H__
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/* XXX: We forward declare CoglBitmap here to allow for circular
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* dependencies between some headers */
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typedef struct _CoglBitmap CoglBitmap;
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#include <cogl/cogl-types.h>
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#include <cogl/cogl-buffer.h>
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#include <cogl/cogl-context.h>
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#include <cogl/cogl-pixel-buffer.h>
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#ifdef COGL_HAS_ANDROID_SUPPORT
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#include <android/asset_manager.h>
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#endif
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COGL_BEGIN_DECLS
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/**
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* SECTION:cogl-bitmap
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* @short_description: Functions 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 #CoglError 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: (transfer full): a #CoglBitmap to the new loaded
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* image data, or %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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CoglError **error);
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#ifdef COGL_HAS_ANDROID_SUPPORT
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/**
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* cogl_android_bitmap_new_from_asset:
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* @context: A #CoglContext
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* @manager: An Android Asset Manager.
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* @filename: The file name for the asset
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* @error: A return location for a CoglError exception.
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*
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* Loads an Android asset into a newly allocated #CoglBitmap.
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*
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* Return value: (transfer full): A newly allocated #CoglBitmap
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* holding the image data of the specified asset.
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*
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* Since: 2.0
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*/
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CoglBitmap *
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cogl_android_bitmap_new_from_asset (CoglContext *context,
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AAssetManager *manager,
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const char *filename,
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CoglError **error);
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#endif
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#if defined (COGL_ENABLE_EXPERIMENTAL_API)
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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: (transfer full): 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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/**
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* cogl_bitmap_new_with_size:
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* @context: A #CoglContext
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* @width: width of the bitmap in pixels
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* @height: height of the bitmap in pixels
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* @format: the format of the pixels the array will store
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*
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* Creates a new #CoglBitmap with the given width, height and format.
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* The initial contents of the bitmap are undefined.
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*
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* The data for the bitmap will be stored in a newly created
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* #CoglPixelBuffer. You can get a pointer to the pixel buffer using
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* cogl_bitmap_get_buffer(). The #CoglBuffer API can then be
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* used to fill the bitmap with data.
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*
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* <note>Cogl will try its best to provide a hardware array you can
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* map, write into and effectively do a zero copy upload when creating
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* a texture from it with cogl_texture_new_from_bitmap(). For various
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* reasons, such arrays are likely to have a stride larger than width
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* * bytes_per_pixel. The user must take the stride into account when
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* writing into it. The stride can be retrieved with
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* cogl_bitmap_get_rowstride().</note>
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*
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* Return value: (transfer full): a #CoglPixelBuffer representing the
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* newly created array or %NULL on failure
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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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CoglBitmap *
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cogl_bitmap_new_with_size (CoglContext *context,
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unsigned int width,
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unsigned int height,
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CoglPixelFormat format);
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/**
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* cogl_bitmap_new_for_data:
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* @context: A #CoglContext
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* @width: The width of the bitmap.
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* @height: The height of the bitmap.
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* @format: The format of the pixel data.
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* @rowstride: The rowstride of the bitmap (the number of bytes from
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* the start of one row of the bitmap to the next).
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* @data: A pointer to the data. The bitmap will take ownership of this data.
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*
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* Creates a bitmap using some existing data. The data is not copied
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* so the application must keep the buffer alive for the lifetime of
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* the #CoglBitmap. This can be used for example with
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* cogl_framebuffer_read_pixels_into_bitmap() to read data directly
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* into an application buffer with the specified rowstride.
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*
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* Return value: (transfer full): A new #CoglBitmap.
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* Since: 1.10
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* Stability: unstable
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*/
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CoglBitmap *
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cogl_bitmap_new_for_data (CoglContext *context,
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int width,
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int height,
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CoglPixelFormat format,
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int rowstride,
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uint8_t *data);
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/**
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* cogl_bitmap_get_format:
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* @bitmap: A #CoglBitmap
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*
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* Return value: the #CoglPixelFormat that the data for the bitmap is in.
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* Since: 1.10
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* Stability: unstable
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*/
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CoglPixelFormat
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cogl_bitmap_get_format (CoglBitmap *bitmap);
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/**
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* cogl_bitmap_get_width:
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* @bitmap: A #CoglBitmap
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*
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* Return value: the width of the bitmap
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* Since: 1.10
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* Stability: unstable
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*/
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int
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cogl_bitmap_get_width (CoglBitmap *bitmap);
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/**
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* cogl_bitmap_get_height:
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* @bitmap: A #CoglBitmap
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*
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* Return value: the height of the bitmap
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* Since: 1.10
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* Stability: unstable
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*/
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int
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cogl_bitmap_get_height (CoglBitmap *bitmap);
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/**
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* cogl_bitmap_get_rowstride:
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* @bitmap: A #CoglBitmap
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*
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* Return value: the rowstride of the bitmap. This is the number of
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* bytes between the address of start of one row to the address of the
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* next row in the image.
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* Since: 1.10
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* Stability: unstable
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*/
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int
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cogl_bitmap_get_rowstride (CoglBitmap *bitmap);
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/**
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* cogl_bitmap_get_buffer:
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* @bitmap: A #CoglBitmap
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*
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* Return value: (transfer none): the #CoglPixelBuffer that this
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* buffer uses for storage. Note that if the bitmap was created with
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* cogl_bitmap_new_from_file() then it will not actually be using a
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* pixel buffer and this function will return %NULL.
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* Stability: unstable
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* Since: 1.10
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*/
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CoglPixelBuffer *
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cogl_bitmap_get_buffer (CoglBitmap *bitmap);
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#endif /* COGL_ENABLE_EXPERIMENTAL_API */
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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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CoglBool
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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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* @object: a #CoglObject pointer
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*
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* Checks whether @object is a #CoglBitmap
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*
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* Return value: %TRUE if the passed @object 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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CoglBool
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cogl_is_bitmap (void *object);
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/**
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* COGL_BITMAP_ERROR:
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*
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* #CoglError 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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uint32_t cogl_bitmap_error_quark (void);
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COGL_END_DECLS
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#endif /* __COGL_BITMAP_H__ */
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