mirror of https://github.com/GNOME/gimp.git
528 lines
12 KiB
C
528 lines
12 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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <string.h>
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#include <glib-object.h>
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#include "libgimpbase/gimpbase.h"
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#include "libgimpcolor/gimpcolor.h"
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#include "base-types.h"
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#include "paint-funcs/paint-funcs.h"
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#include "pixel-region.h"
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#include "temp-buf.h"
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static void temp_buf_to_color (TempBuf *src_buf,
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TempBuf *dest_buf);
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static void temp_buf_to_gray (TempBuf *src_buf,
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TempBuf *dest_buf);
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TempBuf *
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temp_buf_new (gint width,
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gint height,
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gint bytes,
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gint x,
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gint y,
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const guchar *color)
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{
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TempBuf *temp;
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g_return_val_if_fail (width > 0 && height > 0, NULL);
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g_return_val_if_fail (bytes > 0, NULL);
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temp = g_slice_new (TempBuf);
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temp->bytes = bytes;
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temp->width = width;
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temp->height = height;
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temp->x = x;
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temp->y = y;
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temp->data = g_new (guchar, width * height * bytes);
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/* initialize the data */
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if (color)
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{
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glong i;
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/* First check if we can save a lot of work */
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for (i = 1; i < bytes; i++)
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{
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if (color[0] != color[i])
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break;
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}
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if (i == bytes)
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{
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memset (temp->data, *color, width * height * bytes);
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}
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else /* No, we cannot */
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{
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guchar *dptr = temp->data;
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/* Fill the first row */
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for (i = width - 1; i >= 0; --i)
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{
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const guchar *c = color;
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gint j = bytes;
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while (j--)
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*dptr++ = *c++;
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}
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/* Now copy from it (we set bytes to bytes-per-row now) */
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bytes *= width;
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while (--height)
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{
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memcpy (dptr, temp->data, bytes);
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dptr += bytes;
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}
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}
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}
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return temp;
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}
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/* This function simply renders a checkerboard with the given
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parameters into a newly allocated RGB tempbuf */
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TempBuf *
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temp_buf_new_check (gint width,
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gint height,
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GimpCheckType check_type,
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GimpCheckSize check_size)
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{
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TempBuf *new;
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guchar *data;
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guchar check_shift = 0;
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guchar check_mod = 0;
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guchar check_light = 0;
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guchar check_dark = 0;
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gint x, y;
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g_return_val_if_fail (width > 0 && height > 0, NULL);
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switch (check_size)
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{
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case GIMP_CHECK_SIZE_SMALL_CHECKS:
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check_mod = 0x3;
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check_shift = 2;
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break;
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case GIMP_CHECK_SIZE_MEDIUM_CHECKS:
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check_mod = 0x7;
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check_shift = 3;
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break;
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case GIMP_CHECK_SIZE_LARGE_CHECKS:
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check_mod = 0xf;
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check_shift = 4;
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break;
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}
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gimp_checks_get_shades (check_type, &check_light, &check_dark);
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new = temp_buf_new (width, height, 3, 0, 0, NULL);
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data = temp_buf_get_data (new);
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for (y = 0; y < height; y++)
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{
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guchar check_dark = y >> check_shift;
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guchar color = (check_dark & 0x1) ? check_light : check_dark;
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for (x = 0; x < width; x++)
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{
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*data++ = color;
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*data++ = color;
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*data++ = color;
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if (((x + 1) & check_mod) == 0)
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{
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check_dark += 1;
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color = (check_dark & 0x1) ? check_light : check_dark;
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}
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}
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}
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return new;
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}
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TempBuf *
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temp_buf_copy (TempBuf *src,
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TempBuf *dest)
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{
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g_return_val_if_fail (src != NULL, NULL);
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g_return_val_if_fail (! dest || (dest->width == src->width &&
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dest->height == src->height), NULL);
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if (! dest)
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dest = temp_buf_new (src->width, src->height, src->bytes, 0, 0, NULL);
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if (src->bytes != dest->bytes)
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{
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if (src->bytes == 4 && dest->bytes == 2) /* RGBA -> GRAYA */
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temp_buf_to_gray (src, dest);
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else if (src->bytes == 3 && dest->bytes == 1) /* RGB -> GRAY */
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temp_buf_to_gray (src, dest);
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else if (src->bytes == 2 && dest->bytes == 4) /* GRAYA -> RGBA */
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temp_buf_to_color (src, dest);
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else if (src->bytes == 1 && dest->bytes == 3) /* GRAY -> RGB */
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temp_buf_to_color (src, dest);
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else
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g_warning ("temp_buf_copy(): unimplemented color conversion");
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}
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else
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{
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memcpy (temp_buf_get_data (dest),
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temp_buf_get_data (src),
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src->width * src->height * src->bytes);
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}
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return dest;
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}
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TempBuf *
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temp_buf_resize (TempBuf *buf,
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gint bytes,
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gint x,
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gint y,
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gint width,
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gint height)
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{
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g_return_val_if_fail (width > 0 && height > 0, NULL);
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if (! buf)
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{
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buf = temp_buf_new (width, height, bytes, x, y, NULL);
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}
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else
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{
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gsize size = width * height * bytes;
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if (size != (buf->width * buf->height * buf->bytes))
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{
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buf->data = g_renew (guchar, buf->data, size);
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}
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buf->x = x;
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buf->y = y;
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buf->width = width;
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buf->height = height;
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buf->bytes = bytes;
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}
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return buf;
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}
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TempBuf *
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temp_buf_scale (TempBuf *src,
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gint new_width,
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gint new_height)
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{
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TempBuf *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 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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dest = temp_buf_new (new_width,
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new_height,
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src->bytes,
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0, 0, NULL);
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src_data = temp_buf_get_data (src);
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dest_data = 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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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) * src->bytes +
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(gint) (loop1 * y_ratio) * src->bytes * src->width;
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dest_pixel = dest_data +
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(loop2 + loop1 * new_width) * src->bytes;
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for (i = 0 ; i < src->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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TempBuf *
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temp_buf_copy_area (TempBuf *src,
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TempBuf *dest,
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gint x,
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gint y,
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gint width,
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gint height,
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gint dest_x,
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gint dest_y)
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{
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TempBuf *new;
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PixelRegion srcPR = { 0, };
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PixelRegion destPR = { 0, };
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guchar empty[MAX_CHANNELS] = { 0, 0, 0, 0 };
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gint x1, y1, x2, y2;
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g_return_val_if_fail (src != NULL, dest);
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g_return_val_if_fail (!dest || dest->bytes == src->bytes, dest);
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g_return_val_if_fail (width + dest_x > 0, dest);
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g_return_val_if_fail (height + dest_y > 0, dest);
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g_return_val_if_fail (!dest || dest->width >= width + dest_x, dest);
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g_return_val_if_fail (!dest || dest->height >= height + dest_y, dest);
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/* some bounds checking */
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x1 = CLAMP (x, 0, src->width - 1);
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y1 = CLAMP (y, 0, src->height - 1);
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x2 = CLAMP (x + width - 1, 0, src->width - 1);
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y2 = CLAMP (y + height - 1, 0, src->height - 1);
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if (!(x2 - x1) || !(y2 - y1))
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return dest;
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width = x2 - x1 + 1;
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height = y2 - y1 + 1;
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if (! dest)
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{
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new = temp_buf_new (width + dest_x,
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height + dest_y,
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src->bytes,
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0, 0,
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empty);
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}
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else
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{
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new = dest;
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}
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/* Copy the region */
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pixel_region_init_temp_buf (&srcPR, src, x1, y1, width, height);
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pixel_region_init_temp_buf (&destPR, new, dest_x, dest_y, width, height);
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copy_region (&srcPR, &destPR);
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return new;
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}
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/**
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* temp_buf_demultiply:
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* @buf:
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*
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* Converts a TempBuf with pre-multiplied alpha to a 'normal' TempBuf.
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*/
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void
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temp_buf_demultiply (TempBuf *buf)
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{
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guchar *data;
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gint pixels;
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g_return_if_fail (buf != NULL);
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switch (buf->bytes)
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{
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case 1:
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break;
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case 2:
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data = temp_buf_get_data (buf);
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pixels = buf->width * buf->height;
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while (pixels--)
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{
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data[0] = (data[0] << 8) / (data[1] + 1);
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data += 2;
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}
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break;
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case 3:
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break;
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case 4:
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data = temp_buf_get_data (buf);
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pixels = buf->width * buf->height;
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while (pixels--)
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{
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data[0] = (data[0] << 8) / (data[3] + 1);
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data[1] = (data[1] << 8) / (data[3] + 1);
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data[2] = (data[2] << 8) / (data[3] + 1);
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data += 4;
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}
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break;
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default:
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g_return_if_reached ();
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break;
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}
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}
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void
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temp_buf_free (TempBuf *buf)
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{
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g_return_if_fail (buf != NULL);
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if (buf->data)
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g_free (buf->data);
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g_slice_free (TempBuf, buf);
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}
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guchar *
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temp_buf_get_data (TempBuf *buf)
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{
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return buf->data;
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}
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guchar *
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temp_buf_data_clear (TempBuf *buf)
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{
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memset (buf->data, 0, buf->height * buf->width * buf->bytes);
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return buf->data;
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}
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gsize
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temp_buf_get_memsize (TempBuf *buf)
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{
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if (buf)
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return (sizeof (TempBuf) + buf->bytes * buf->width * buf->height);
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return 0;
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}
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/* The conversion routines */
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static void
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temp_buf_to_color (TempBuf *src_buf,
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TempBuf *dest_buf)
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{
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guchar *src;
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guchar *dest;
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glong num_pixels;
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src = temp_buf_get_data (src_buf);
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dest = temp_buf_get_data (dest_buf);
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num_pixels = src_buf->width * src_buf->height;
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switch (dest_buf->bytes)
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{
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case 3:
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g_return_if_fail (src_buf->bytes == 1);
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while (num_pixels--)
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{
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guchar tmp;
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*dest++ = tmp = *src++;
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*dest++ = tmp;
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*dest++ = tmp;
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}
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break;
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case 4:
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g_return_if_fail (src_buf->bytes == 2);
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while (num_pixels--)
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{
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guchar tmp;
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*dest++ = tmp = *src++;
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*dest++ = tmp;
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*dest++ = tmp;
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*dest++ = *src++; /* alpha channel */
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}
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break;
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default:
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g_return_if_reached ();
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break;
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}
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}
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static void
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temp_buf_to_gray (TempBuf *src_buf,
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TempBuf *dest_buf)
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{
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const guchar *src;
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guchar *dest;
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glong num_pixels;
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src = temp_buf_get_data (src_buf);
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dest = temp_buf_get_data (dest_buf);
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num_pixels = src_buf->width * src_buf->height;
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switch (dest_buf->bytes)
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{
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case 1:
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g_return_if_fail (src_buf->bytes == 3);
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while (num_pixels--)
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{
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gint lum = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]) + 0.5;
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*dest++ = (guchar) lum;
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src += 3;
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}
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break;
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case 2:
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g_return_if_fail (src_buf->bytes == 4);
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while (num_pixels--)
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{
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gint lum = GIMP_RGB_LUMINANCE (src[0], src[1], src[2]) + 0.5;
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*dest++ = (guchar) lum;
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*dest++ = src[3]; /* alpha channel */
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src += 4;
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}
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break;
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default:
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g_return_if_reached ();
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break;
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}
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}
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