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This creates a CoglBitmap which points into an existing buffer in system memory. That way it can be used to create a texture or to read pixel data into. The function replaces the existing internal function _cogl_bitmap_new_from_data but removes the destroy notify call back. If the application wants notification of destruction it can just use the cogl_object_set_user_data function as normal. Internally there is now a convenience function to create a bitmap for system memory and automatically free the buffer using that mechanism. The name of the function is inspired by cairo_image_surface_create_for_data which has similar semantics. Reviewed-by: Robert Bragg <robert@linux.intel.com>
146 lines
4.7 KiB
C
146 lines
4.7 KiB
C
/*
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* Clutter COGL
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*
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* A basic GL/GLES Abstraction/Utility Layer
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*
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* Authored By Matthew Allum <mallum@openedhand.com>
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*
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* Copyright (C) 2007 OpenedHand
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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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#ifndef __COGL_BITMAP_H
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#define __COGL_BITMAP_H
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#include <glib.h>
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#include "cogl-handle.h"
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#include "cogl-buffer.h"
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#include "cogl-bitmap.h"
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/*
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* _cogl_bitmap_new_with_malloc_buffer:
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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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* This is equivalent to cogl_bitmap_new_with_size() except that it
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* allocated the buffer using g_malloc() instead of creating a
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* #CoglPixelBuffer. The buffer will be automatically destroyed when
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* the bitmap is freed.
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*
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* Return value: a #CoglPixelBuffer representing the newly created array
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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_malloc_buffer (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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/* The idea of this function is that it will create a bitmap that
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shares the actual data with another bitmap. This is needed for the
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atlas texture backend because it needs upload a bitmap to a sub
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texture but override the format so that it ignores the premult
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flag. */
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CoglBitmap *
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_cogl_bitmap_new_shared (CoglBitmap *shared_bmp,
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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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CoglBitmap *
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_cogl_bitmap_convert (CoglBitmap *bmp,
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CoglPixelFormat dst_format);
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gboolean
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_cogl_bitmap_convert_into_bitmap (CoglBitmap *src_bmp,
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CoglBitmap *dst_bmp);
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CoglBitmap *
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_cogl_bitmap_from_file (const char *filename,
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GError **error);
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gboolean
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_cogl_bitmap_unpremult (CoglBitmap *dst_bmp);
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gboolean
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_cogl_bitmap_premult (CoglBitmap *dst_bmp);
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gboolean
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_cogl_bitmap_convert_premult_status (CoglBitmap *bmp,
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CoglPixelFormat dst_format);
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gboolean
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_cogl_bitmap_copy_subregion (CoglBitmap *src,
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CoglBitmap *dst,
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int src_x,
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int src_y,
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int dst_x,
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int dst_y,
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int width,
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int height);
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/* Creates a deep copy of the source bitmap */
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CoglBitmap *
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_cogl_bitmap_copy (CoglBitmap *src_bmp);
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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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void
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_cogl_bitmap_set_format (CoglBitmap *bitmap,
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CoglPixelFormat format);
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/* Maps the bitmap so that the pixels can be accessed directly or if
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the bitmap is just a memory bitmap then it just returns the pointer
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to memory. Note that the bitmap isn't guaranteed to allocated to
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the full size of rowstride*height so it is not safe to read up to
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the rowstride of the last row. This will be the case if the user
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uploads data using gdk_pixbuf_new_subpixbuf with a sub region
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containing the last row of the pixbuf because in that case the
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rowstride can be much larger than the width of the image */
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guint8 *
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_cogl_bitmap_map (CoglBitmap *bitmap,
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CoglBufferAccess access,
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CoglBufferMapHint hints);
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void
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_cogl_bitmap_unmap (CoglBitmap *bitmap);
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/* These two are replacements for map and unmap that should used when
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the pointer is going to be passed to GL for pixel packing or
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unpacking. The address might not be valid for reading if the bitmap
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was created with new_from_buffer but it will however be good to
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pass to glTexImage2D for example. The access should be READ for
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unpacking and WRITE for packing. It can not be both */
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guint8 *
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_cogl_bitmap_bind (CoglBitmap *bitmap,
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CoglBufferAccess access,
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CoglBufferMapHint hints);
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void
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_cogl_bitmap_unbind (CoglBitmap *bitmap);
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#endif /* __COGL_BITMAP_H */
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