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286 lines
8.9 KiB
C
286 lines
8.9 KiB
C
/* Libart_LGPL - library of basic graphic primitives
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* Copyright (C) 1998 Raph Levien
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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 Library 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "art_misc.h"
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#include "art_pixbuf.h"
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#include <string.h> /* memcpy */
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/**
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* art_pixbuf_new_rgb_dnotify: Create a new RGB #ArtPixBuf with explicit destroy notification.
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* @pixels: A buffer containing the actual pixel data.
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* @width: The width of the pixbuf.
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* @height: The height of the pixbuf.
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* @rowstride: The rowstride of the pixbuf.
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* @dfunc_data: The private data passed to @dfunc.
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* @dfunc: The destroy notification function.
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*
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* Creates a generic data structure for holding a buffer of RGB
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* pixels. It is possible to think of an #ArtPixBuf as a
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* virtualization over specific pixel buffer formats.
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*
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* @dfunc is called with @dfunc_data and @pixels as arguments when the
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* #ArtPixBuf is destroyed. Using a destroy notification function
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* allows a wide range of memory management disciplines for the pixel
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* memory. A NULL value for @dfunc is also allowed and means that no
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* special action will be taken on destruction.
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*
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* Return value: The newly created #ArtPixBuf.
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**/
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ArtPixBuf *
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art_pixbuf_new_rgb_dnotify (art_u8 *pixels, int width, int height, int rowstride,
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void *dfunc_data, ArtDestroyNotify dfunc)
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{
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ArtPixBuf *pixbuf;
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pixbuf = art_new (ArtPixBuf, 1);
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pixbuf->format = ART_PIX_RGB;
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pixbuf->n_channels = 3;
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pixbuf->has_alpha = 0;
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pixbuf->bits_per_sample = 8;
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pixbuf->pixels = (art_u8 *) pixels;
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pixbuf->width = width;
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pixbuf->height = height;
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pixbuf->rowstride = rowstride;
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pixbuf->destroy_data = dfunc_data;
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pixbuf->destroy = dfunc;
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return pixbuf;
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}
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/**
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* art_pixbuf_new_rgba_dnotify: Create a new RGBA #ArtPixBuf with explicit destroy notification.
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* @pixels: A buffer containing the actual pixel data.
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* @width: The width of the pixbuf.
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* @height: The height of the pixbuf.
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* @rowstride: The rowstride of the pixbuf.
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* @dfunc_data: The private data passed to @dfunc.
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* @dfunc: The destroy notification function.
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*
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* Creates a generic data structure for holding a buffer of RGBA
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* pixels. It is possible to think of an #ArtPixBuf as a
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* virtualization over specific pixel buffer formats.
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*
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* @dfunc is called with @dfunc_data and @pixels as arguments when the
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* #ArtPixBuf is destroyed. Using a destroy notification function
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* allows a wide range of memory management disciplines for the pixel
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* memory. A NULL value for @dfunc is also allowed and means that no
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* special action will be taken on destruction.
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*
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* Return value: The newly created #ArtPixBuf.
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**/
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ArtPixBuf *
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art_pixbuf_new_rgba_dnotify (art_u8 *pixels, int width, int height, int rowstride,
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void *dfunc_data, ArtDestroyNotify dfunc)
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{
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ArtPixBuf *pixbuf;
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pixbuf = art_new (ArtPixBuf, 1);
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pixbuf->format = ART_PIX_RGB;
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pixbuf->n_channels = 4;
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pixbuf->has_alpha = 1;
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pixbuf->bits_per_sample = 8;
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pixbuf->pixels = (art_u8 *) pixels;
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pixbuf->width = width;
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pixbuf->height = height;
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pixbuf->rowstride = rowstride;
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pixbuf->destroy_data = dfunc_data;
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pixbuf->destroy = dfunc;
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return pixbuf;
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}
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/**
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* art_pixbuf_new_const_rgb: Create a new RGB #ArtPixBuf with constant pixel data.
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* @pixels: A buffer containing the actual pixel data.
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* @width: The width of the pixbuf.
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* @height: The height of the pixbuf.
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* @rowstride: The rowstride of the pixbuf.
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*
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* Creates a generic data structure for holding a buffer of RGB
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* pixels. It is possible to think of an #ArtPixBuf as a
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* virtualization over specific pixel buffer formats.
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*
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* No action is taken when the #ArtPixBuf is destroyed. Thus, this
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* function is useful when the pixel data is constant or statically
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* allocated.
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*
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* Return value: The newly created #ArtPixBuf.
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**/
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ArtPixBuf *
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art_pixbuf_new_const_rgb (const art_u8 *pixels, int width, int height, int rowstride)
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{
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return art_pixbuf_new_rgb_dnotify ((art_u8 *) pixels, width, height, rowstride, NULL, NULL);
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}
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/**
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* art_pixbuf_new_const_rgba: Create a new RGBA #ArtPixBuf with constant pixel data.
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* @pixels: A buffer containing the actual pixel data.
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* @width: The width of the pixbuf.
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* @height: The height of the pixbuf.
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* @rowstride: The rowstride of the pixbuf.
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*
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* Creates a generic data structure for holding a buffer of RGBA
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* pixels. It is possible to think of an #ArtPixBuf as a
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* virtualization over specific pixel buffer formats.
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*
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* No action is taken when the #ArtPixBuf is destroyed. Thus, this
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* function is suitable when the pixel data is constant or statically
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* allocated.
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*
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* Return value: The newly created #ArtPixBuf.
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**/
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ArtPixBuf *
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art_pixbuf_new_const_rgba (const art_u8 *pixels, int width, int height, int rowstride)
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{
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return art_pixbuf_new_rgba_dnotify ((art_u8 *) pixels, width, height, rowstride, NULL, NULL);
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}
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static void
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art_pixel_destroy (void *func_data, void *data)
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{
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art_free (data);
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}
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/**
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* art_pixbuf_new_rgb: Create a new RGB #ArtPixBuf.
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* @pixels: A buffer containing the actual pixel data.
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* @width: The width of the pixbuf.
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* @height: The height of the pixbuf.
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* @rowstride: The rowstride of the pixbuf.
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*
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* Creates a generic data structure for holding a buffer of RGB
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* pixels. It is possible to think of an #ArtPixBuf as a
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* virtualization over specific pixel buffer formats.
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*
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* The @pixels buffer is freed with art_free() when the #ArtPixBuf is
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* destroyed. Thus, this function is suitable when the pixel data is
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* allocated with art_alloc().
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*
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* Return value: The newly created #ArtPixBuf.
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**/
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ArtPixBuf *
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art_pixbuf_new_rgb (art_u8 *pixels, int width, int height, int rowstride)
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{
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return art_pixbuf_new_rgb_dnotify (pixels, width, height, rowstride, NULL, art_pixel_destroy);
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}
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/**
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* art_pixbuf_new_rgba: Create a new RGBA #ArtPixBuf.
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* @pixels: A buffer containing the actual pixel data.
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* @width: The width of the pixbuf.
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* @height: The height of the pixbuf.
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* @rowstride: The rowstride of the pixbuf.
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*
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* Creates a generic data structure for holding a buffer of RGBA
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* pixels. It is possible to think of an #ArtPixBuf as a
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* virtualization over specific pixel buffer formats.
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*
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* The @pixels buffer is freed with art_free() when the #ArtPixBuf is
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* destroyed. Thus, this function is suitable when the pixel data is
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* allocated with art_alloc().
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*
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* Return value: The newly created #ArtPixBuf.
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**/
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ArtPixBuf *
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art_pixbuf_new_rgba (art_u8 *pixels, int width, int height, int rowstride)
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{
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return art_pixbuf_new_rgba_dnotify (pixels, width, height, rowstride, NULL, art_pixel_destroy);
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}
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/**
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* art_pixbuf_free: Destroy an #ArtPixBuf.
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* @pixbuf: The #ArtPixBuf to be destroyed.
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*
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* Destroys the #ArtPixBuf, calling the destroy notification function
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* (if non-NULL) so that the memory for the pixel buffer can be
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* properly reclaimed.
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**/
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void
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art_pixbuf_free (ArtPixBuf *pixbuf)
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{
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ArtDestroyNotify destroy = pixbuf->destroy;
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void *destroy_data = pixbuf->destroy_data;
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art_u8 *pixels = pixbuf->pixels;
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pixbuf->pixels = NULL;
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pixbuf->destroy = NULL;
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pixbuf->destroy_data = NULL;
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if (destroy)
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destroy (destroy_data, pixels);
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art_free (pixbuf);
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}
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/**
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* art_pixbuf_free_shallow:
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* @pixbuf: The #ArtPixBuf to be destroyed.
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*
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* Destroys the #ArtPixBuf without calling the destroy notification function.
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*
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* This function is deprecated. Use the _dnotify variants for
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* allocation instead.
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**/
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void
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art_pixbuf_free_shallow (ArtPixBuf *pixbuf)
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{
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art_free (pixbuf);
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}
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/**
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* art_pixbuf_duplicate: Duplicate a pixbuf.
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* @pixbuf: The #ArtPixBuf to duplicate.
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*
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* Duplicates a pixbuf, including duplicating the buffer.
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*
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* Return value: The duplicated pixbuf.
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**/
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ArtPixBuf *
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art_pixbuf_duplicate (const ArtPixBuf *pixbuf)
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{
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ArtPixBuf *result;
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int size;
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result = art_new (ArtPixBuf, 1);
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result->format = pixbuf->format;
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result->n_channels = pixbuf->n_channels;
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result->has_alpha = pixbuf->has_alpha;
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result->bits_per_sample = pixbuf->bits_per_sample;
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size = (pixbuf->height - 1) * pixbuf->rowstride +
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pixbuf->width * ((pixbuf->n_channels * pixbuf->bits_per_sample + 7) >> 3);
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result->pixels = art_alloc (size);
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memcpy(result->pixels, pixbuf->pixels, size);
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result->width = pixbuf->width;
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result->height = pixbuf->height;
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result->rowstride = pixbuf->rowstride;
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result->destroy_data = NULL;
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result->destroy = art_pixel_destroy;
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return result;
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}
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