mirror of https://github.com/GNOME/gimp.git
429 lines
10 KiB
C
429 lines
10 KiB
C
/* GIMP - The GNU Image Manipulation Program
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <string.h>
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#include <cairo.h>
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#include <gegl.h>
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#include <gegl-utils.h>
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#include <glib/gstdio.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "core-types.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "gimptempbuf.h"
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#define LOCK_DATA_ALIGNMENT 16
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struct _GimpTempBuf
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{
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gint ref_count;
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gint width;
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gint height;
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const Babl *format;
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guchar *data;
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};
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typedef struct
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{
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const Babl *format;
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GeglAccessMode access_mode;
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} LockData;
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G_STATIC_ASSERT (sizeof (LockData) <= LOCK_DATA_ALIGNMENT);
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GimpTempBuf *
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gimp_temp_buf_new (gint width,
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gint height,
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const Babl *format)
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{
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GimpTempBuf *temp;
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gint bpp;
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g_return_val_if_fail (format != NULL, NULL);
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bpp = babl_format_get_bytes_per_pixel (format);
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g_return_val_if_fail (width > 0 && height > 0 && bpp > 0, NULL);
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g_return_val_if_fail (G_MAXSIZE / width / height / bpp > 0, NULL);
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temp = g_slice_new (GimpTempBuf);
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temp->ref_count = 1;
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temp->width = width;
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temp->height = height;
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temp->format = format;
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temp->data = gegl_malloc ((gsize) width * height * bpp);
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return temp;
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}
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GimpTempBuf *
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gimp_temp_buf_new_from_pixbuf (GdkPixbuf *pixbuf,
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const Babl *f_or_null)
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{
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const Babl *format = f_or_null;
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const Babl *fish = NULL;
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GimpTempBuf *temp_buf;
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const guchar *pixels;
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gint width;
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gint height;
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gint rowstride;
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gint bpp;
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guchar *data;
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gint i;
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g_return_val_if_fail (GDK_IS_PIXBUF (pixbuf), NULL);
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if (! format)
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format = gimp_pixbuf_get_format (pixbuf);
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pixels = gdk_pixbuf_get_pixels (pixbuf);
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width = gdk_pixbuf_get_width (pixbuf);
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height = gdk_pixbuf_get_height (pixbuf);
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rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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temp_buf = gimp_temp_buf_new (width, height, format);
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data = gimp_temp_buf_get_data (temp_buf);
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bpp = babl_format_get_bytes_per_pixel (format);
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if (gimp_pixbuf_get_format (pixbuf) != format)
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fish = babl_fish (gimp_pixbuf_get_format (pixbuf), format);
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for (i = 0; i < height; i++)
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{
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if (fish)
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babl_process (fish, pixels, data, width);
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else
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memcpy (data, pixels, width * bpp);
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data += width * bpp;
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pixels += rowstride;
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}
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return temp_buf;
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}
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GimpTempBuf *
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gimp_temp_buf_copy (const GimpTempBuf *src)
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{
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GimpTempBuf *dest;
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g_return_val_if_fail (src != NULL, NULL);
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dest = gimp_temp_buf_new (src->width, src->height, src->format);
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memcpy (gimp_temp_buf_get_data (dest),
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gimp_temp_buf_get_data (src),
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gimp_temp_buf_get_data_size (src));
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return dest;
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}
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GimpTempBuf *
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gimp_temp_buf_ref (GimpTempBuf *buf)
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{
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g_return_val_if_fail (buf != NULL, NULL);
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buf->ref_count++;
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return buf;
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}
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void
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gimp_temp_buf_unref (GimpTempBuf *buf)
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{
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g_return_if_fail (buf != NULL);
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g_return_if_fail (buf->ref_count > 0);
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buf->ref_count--;
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if (buf->ref_count < 1)
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{
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if (buf->data)
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gegl_free (buf->data);
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g_slice_free (GimpTempBuf, buf);
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}
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}
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GimpTempBuf *
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gimp_temp_buf_scale (const GimpTempBuf *src,
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gint new_width,
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gint new_height)
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{
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GimpTempBuf *dest;
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const guchar *src_data;
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guchar *dest_data;
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gdouble x_ratio;
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gdouble y_ratio;
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gint bytes;
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gint loop1;
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gint loop2;
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g_return_val_if_fail (src != NULL, NULL);
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g_return_val_if_fail (new_width > 0 && new_height > 0, NULL);
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if (new_width == src->width && new_height == src->height)
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return gimp_temp_buf_copy (src);
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dest = gimp_temp_buf_new (new_width,
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new_height,
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src->format);
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src_data = gimp_temp_buf_get_data (src);
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dest_data = gimp_temp_buf_get_data (dest);
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x_ratio = (gdouble) src->width / (gdouble) new_width;
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y_ratio = (gdouble) src->height / (gdouble) new_height;
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bytes = babl_format_get_bytes_per_pixel (src->format);
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for (loop1 = 0 ; loop1 < new_height ; loop1++)
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{
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for (loop2 = 0 ; loop2 < new_width ; loop2++)
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{
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const guchar *src_pixel;
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guchar *dest_pixel;
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gint i;
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src_pixel = src_data +
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(gint) (loop2 * x_ratio) * bytes +
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(gint) (loop1 * y_ratio) * bytes * src->width;
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dest_pixel = dest_data +
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(loop2 + loop1 * new_width) * bytes;
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for (i = 0 ; i < bytes; i++)
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*dest_pixel++ = *src_pixel++;
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}
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}
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return dest;
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}
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gint
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gimp_temp_buf_get_width (const GimpTempBuf *buf)
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{
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return buf->width;
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}
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gint
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gimp_temp_buf_get_height (const GimpTempBuf *buf)
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{
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return buf->height;
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}
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const Babl *
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gimp_temp_buf_get_format (const GimpTempBuf *buf)
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{
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return buf->format;
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}
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void
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gimp_temp_buf_set_format (GimpTempBuf *buf,
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const Babl *format)
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{
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g_return_if_fail (babl_format_get_bytes_per_pixel (buf->format) ==
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babl_format_get_bytes_per_pixel (format));
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buf->format = format;
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}
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guchar *
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gimp_temp_buf_get_data (const GimpTempBuf *buf)
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{
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return buf->data;
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}
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gsize
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gimp_temp_buf_get_data_size (const GimpTempBuf *buf)
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{
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return (gsize) babl_format_get_bytes_per_pixel (buf->format) *
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buf->width * buf->height;
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}
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guchar *
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gimp_temp_buf_data_clear (GimpTempBuf *buf)
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{
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memset (buf->data, 0, gimp_temp_buf_get_data_size (buf));
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return buf->data;
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}
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gpointer
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gimp_temp_buf_lock (const GimpTempBuf *buf,
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const Babl *format,
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GeglAccessMode access_mode)
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{
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guchar *data;
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LockData *lock_data;
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gint n_pixels;
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gint bpp;
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g_return_val_if_fail (buf != NULL, NULL);
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if (! format || format == buf->format)
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return gimp_temp_buf_get_data (buf);
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n_pixels = buf->width * buf->height;
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bpp = babl_format_get_bytes_per_pixel (format);
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data = gegl_scratch_alloc (LOCK_DATA_ALIGNMENT + n_pixels * bpp);
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if ((guintptr) data % LOCK_DATA_ALIGNMENT)
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{
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g_free (data);
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g_return_val_if_reached (NULL);
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}
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lock_data = (LockData *) data;
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lock_data->format = format;
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lock_data->access_mode = access_mode;
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data += LOCK_DATA_ALIGNMENT;
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if (access_mode & GEGL_ACCESS_READ)
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{
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babl_process (babl_fish (buf->format, format),
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gimp_temp_buf_get_data (buf),
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data,
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n_pixels);
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}
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return data;
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}
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void
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gimp_temp_buf_unlock (const GimpTempBuf *buf,
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gconstpointer data)
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{
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LockData *lock_data;
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g_return_if_fail (buf != NULL);
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g_return_if_fail (data != NULL);
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if (data == buf->data)
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return;
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lock_data = (LockData *) ((const guint8 *) data - LOCK_DATA_ALIGNMENT);
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if (lock_data->access_mode & GEGL_ACCESS_WRITE)
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{
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babl_process (babl_fish (lock_data->format, buf->format),
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data,
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gimp_temp_buf_get_data (buf),
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buf->width * buf->height);
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}
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gegl_scratch_free (lock_data);
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}
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gsize
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gimp_temp_buf_get_memsize (const GimpTempBuf *buf)
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{
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if (buf)
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return (sizeof (GimpTempBuf) + gimp_temp_buf_get_data_size (buf));
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return 0;
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}
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GeglBuffer *
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gimp_temp_buf_create_buffer (GimpTempBuf *temp_buf)
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{
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GeglBuffer *buffer;
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g_return_val_if_fail (temp_buf != NULL, NULL);
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buffer =
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gegl_buffer_linear_new_from_data (gimp_temp_buf_get_data (temp_buf),
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temp_buf->format,
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GEGL_RECTANGLE (0, 0,
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temp_buf->width,
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temp_buf->height),
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GEGL_AUTO_ROWSTRIDE,
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(GDestroyNotify) gimp_temp_buf_unref,
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gimp_temp_buf_ref (temp_buf));
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g_object_set_data (G_OBJECT (buffer), "gimp-temp-buf", temp_buf);
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return buffer;
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}
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GdkPixbuf *
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gimp_temp_buf_create_pixbuf (GimpTempBuf *temp_buf)
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{
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GdkPixbuf *pixbuf;
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const Babl *format;
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const Babl *fish = NULL;
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const guchar *data;
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gint width;
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gint height;
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gint bpp;
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guchar *pixels;
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gint rowstride;
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gint i;
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g_return_val_if_fail (temp_buf != NULL, NULL);
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data = gimp_temp_buf_get_data (temp_buf);
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format = gimp_temp_buf_get_format (temp_buf);
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width = gimp_temp_buf_get_width (temp_buf);
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height = gimp_temp_buf_get_height (temp_buf);
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bpp = babl_format_get_bytes_per_pixel (format);
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pixbuf = gdk_pixbuf_new (GDK_COLORSPACE_RGB,
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babl_format_has_alpha (format),
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8, width, height);
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pixels = gdk_pixbuf_get_pixels (pixbuf);
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rowstride = gdk_pixbuf_get_rowstride (pixbuf);
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if (format != gimp_pixbuf_get_format (pixbuf))
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fish = babl_fish (format, gimp_pixbuf_get_format (pixbuf));
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for (i = 0; i < height; i++)
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{
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if (fish)
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babl_process (fish, data, pixels, width);
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else
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memcpy (pixels, data, width * bpp);
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data += width * bpp;
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pixels += rowstride;
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}
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return pixbuf;
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}
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GimpTempBuf *
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gimp_gegl_buffer_get_temp_buf (GeglBuffer *buffer)
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{
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g_return_val_if_fail (GEGL_IS_BUFFER (buffer), NULL);
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return g_object_get_data (G_OBJECT (buffer), "gimp-temp-buf");
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}
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