254 lines
6.5 KiB
C
254 lines
6.5 KiB
C
/*
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DDS GIMP plugin
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Copyright (C) 2004-2012 Shawn Kirst <skirst@gmail.com>,
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with parts (C) 2003 Arne Reuter <homepage@arnereuter.de> where specified.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU 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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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 GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; see the file COPYING. If not, write to
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the Free Software Foundation, 51 Franklin Street, Fifth Floor
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Boston, MA 02110-1301, USA.
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*/
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#include <libgimp/gimp.h>
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#include "misc.h"
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static inline float saturate(float a)
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{
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if(a < 0) a = 0;
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if(a > 1) a = 1;
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return(a);
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}
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void decode_ycocg_image(gint32 drawableID, gboolean shadow)
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{
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GeglBuffer *buffer, *sbuffer;
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const Babl *format;
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unsigned char *data;
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unsigned int i, w, h, num_pixels;
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const float offset = 0.5f * 256.0f / 255.0f;
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float Y, Co, Cg, R, G, B;
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buffer = gimp_drawable_get_buffer(drawableID);
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if(shadow)
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{
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sbuffer = gimp_drawable_get_shadow_buffer(drawableID);
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gegl_buffer_copy(buffer, NULL, GEGL_ABYSS_NONE, sbuffer, NULL);
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g_object_unref(buffer);
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buffer = sbuffer;
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}
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format = babl_format("R'G'B'A u8");
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w = gegl_buffer_get_width(buffer);
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h = gegl_buffer_get_height(buffer);
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num_pixels = w * h;
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data = g_malloc(num_pixels * 4);
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gegl_buffer_get(buffer, GEGL_RECTANGLE(0, 0, w, h), 1.0, format, data,
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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gimp_progress_init("Decoding YCoCg pixels...");
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for(i = 0; i < num_pixels; ++i)
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{
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Y = (float)data[4 * i + 3] / 255.0f;
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Co = (float)data[4 * i + 0] / 255.0f;
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Cg = (float)data[4 * i + 1] / 255.0f;
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/* convert YCoCg to RGB */
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Co -= offset;
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Cg -= offset;
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R = saturate(Y + Co - Cg);
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G = saturate(Y + Cg);
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B = saturate(Y - Co - Cg);
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/* copy new alpha from blue */
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data[4 * i + 3] = data[4 * i + 2];
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data[4 * i + 0] = (unsigned char)(R * 255.0f);
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data[4 * i + 1] = (unsigned char)(G * 255.0f);
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data[4 * i + 2] = (unsigned char)(B * 255.0f);
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if((i & 0x7fff) == 0)
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gimp_progress_update((float)i / (float)num_pixels);
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}
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gegl_buffer_set(buffer, GEGL_RECTANGLE(0, 0, w, h), 0, format, data,
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GEGL_AUTO_ROWSTRIDE);
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gimp_progress_update(1.0);
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gegl_buffer_flush(buffer);
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if(shadow)
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gimp_drawable_merge_shadow(drawableID, TRUE);
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gimp_drawable_update(drawableID, 0, 0, w, h);
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g_free(data);
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g_object_unref(buffer);
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}
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void decode_ycocg_scaled_image(gint32 drawableID, gboolean shadow)
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{
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GeglBuffer *buffer, *sbuffer;
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const Babl *format;
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unsigned char *data;
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unsigned int i, w, h, num_pixels;
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const float offset = 0.5f * 256.0f / 255.0f;
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float Y, Co, Cg, R, G, B, s;
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buffer = gimp_drawable_get_buffer(drawableID);
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if(shadow)
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{
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sbuffer = gimp_drawable_get_shadow_buffer(drawableID);
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gegl_buffer_copy(buffer, NULL, GEGL_ABYSS_NONE, sbuffer, NULL);
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g_object_unref(buffer);
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buffer = sbuffer;
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}
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format = babl_format("R'G'B'A u8");
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w = gegl_buffer_get_width(buffer);
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h = gegl_buffer_get_height(buffer);
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num_pixels = w * h;
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data = g_malloc(num_pixels * 4);
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gegl_buffer_get(buffer, GEGL_RECTANGLE(0, 0, w, h), 1.0, format, data,
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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gimp_progress_init("Decoding YCoCg (scaled) pixels...");
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for(i = 0; i < num_pixels; ++i)
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{
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Y = (float)data[4 * i + 3] / 255.0f;
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Co = (float)data[4 * i + 0] / 255.0f;
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Cg = (float)data[4 * i + 1] / 255.0f;
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s = (float)data[4 * i + 2] / 255.0f;
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/* convert YCoCg to RGB */
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s = 1.0f / ((255.0f / 8.0f) * s + 1.0f);
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Co = (Co - offset) * s;
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Cg = (Cg - offset) * s;
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R = saturate(Y + Co - Cg);
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G = saturate(Y + Cg);
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B = saturate(Y - Co - Cg);
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data[4 * i + 0] = (unsigned char)(R * 255.0f);
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data[4 * i + 1] = (unsigned char)(G * 255.0f);
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data[4 * i + 2] = (unsigned char)(B * 255.0f);
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/* set alpha to 1 */
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data[4 * i + 3] = 255;
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if((i & 0x7fff) == 0)
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gimp_progress_update((float)i / (float)num_pixels);
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}
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gegl_buffer_set(buffer, GEGL_RECTANGLE(0, 0, w, h), 0, format, data,
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GEGL_AUTO_ROWSTRIDE);
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gimp_progress_update(1.0);
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gegl_buffer_flush(buffer);
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if(shadow)
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gimp_drawable_merge_shadow(drawableID, TRUE);
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gimp_drawable_update(drawableID, 0, 0, w, h);
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g_free(data);
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g_object_unref(buffer);
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}
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void decode_alpha_exp_image(gint32 drawableID, gboolean shadow)
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{
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GeglBuffer *buffer, *sbuffer;
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const Babl *format;
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unsigned char *data;
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unsigned int i, w, h, num_pixels;
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int R, G, B, A;
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buffer = gimp_drawable_get_buffer(drawableID);
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if(shadow)
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{
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sbuffer = gimp_drawable_get_shadow_buffer(drawableID);
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gegl_buffer_copy(buffer, NULL, GEGL_ABYSS_NONE, sbuffer, NULL);
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g_object_unref(buffer);
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buffer = sbuffer;
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}
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format = babl_format("R'G'B'A u8");
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w = gegl_buffer_get_width(buffer);
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h = gegl_buffer_get_height(buffer);
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num_pixels = w * h;
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data = g_malloc(num_pixels * 4);
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gegl_buffer_get(buffer, GEGL_RECTANGLE(0, 0, w, h), 1.0, format, data,
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GEGL_AUTO_ROWSTRIDE, GEGL_ABYSS_NONE);
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gimp_progress_init("Decoding Alpha-exponent pixels...");
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for(i = 0; i < num_pixels; ++i)
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{
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R = data[4 * i + 0];
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G = data[4 * i + 1];
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B = data[4 * i + 2];
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A = data[4 * i + 3];
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R = (R * A + 1) >> 8;
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G = (G * A + 1) >> 8;
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B = (B * A + 1) >> 8;
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A = 255;
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data[4 * i + 0] = R;
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data[4 * i + 1] = G;
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data[4 * i + 2] = B;
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data[4 * i + 3] = A;
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if((i & 0x7fff) == 0)
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gimp_progress_update((float)i / (float)num_pixels);
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}
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gegl_buffer_set(buffer, GEGL_RECTANGLE(0, 0, w, h), 0, format, data,
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GEGL_AUTO_ROWSTRIDE);
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gimp_progress_update(1.0);
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gegl_buffer_flush(buffer);
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if(shadow)
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gimp_drawable_merge_shadow(drawableID, TRUE);
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gimp_drawable_update(drawableID, 0, 0, w, h);
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g_free(data);
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g_object_unref(buffer);
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}
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