Doxygen Source Code Documentation
gifunopt.c File Reference
#include "gif.h"#include <assert.h>#include <string.h>Go to the source code of this file.
Defines | |
| #define | TRANSPARENT 256 |
Functions | |
| void | put_image_in_screen (Gif_Stream *gfs, Gif_Image *gfi, u_int16_t *screen) |
| void | put_background_in_screen (Gif_Stream *gfs, Gif_Image *gfi, u_int16_t *screen) |
| int | create_image_data (Gif_Stream *gfs, Gif_Image *gfi, u_int16_t *screen, byte *new_data) |
| int | unoptimize_image (Gif_Stream *gfs, Gif_Image *gfi, u_int16_t *screen) |
| int | Gif_Unoptimize (Gif_Stream *gfs) |
Define Documentation
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Definition at line 24 of file gifunopt.c. Referenced by create_image_data(), Gif_Unoptimize(), and put_background_in_screen(). |
Function Documentation
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Definition at line 72 of file gifunopt.c. References Gif_Colormap::col, Gif_ReArray, Gif_Stream::global, i, move(), Gif_Colormap::ncol, Gif_Stream::screen_height, Gif_Stream::screen_width, Gif_Image::transparent, TRANSPARENT, and u_int16_t. Referenced by unoptimize_image().
00074 {
00075 int have[257];
00076 int transparent = -1;
00077 int size = gfs->screen_width * gfs->screen_height;
00078 u_int16_t *move;
00079 int i;
00080
00081 /* mark colors used opaquely in the image */
00082 assert(TRANSPARENT == 256);
00083 for (i = 0; i < 257; i++)
00084 have[i] = 0;
00085 for (i = 0, move = screen; i < size; i++, move++)
00086 have[*move] = 1;
00087
00088 /* the new transparent color is a color unused in either */
00089 if (have[TRANSPARENT]) {
00090 for (i = 0; i < 256 && transparent < 0; i++)
00091 if (!have[i])
00092 transparent = i;
00093 if (transparent < 0)
00094 goto error;
00095 if (transparent >= gfs->global->ncol) {
00096 Gif_ReArray(gfs->global->col, Gif_Color, 256);
00097 if (!gfs->global->col) goto error;
00098 gfs->global->ncol = transparent + 1;
00099 }
00100 }
00101
00102 /* map the wide image onto the new data */
00103 for (i = 0, move = screen; i < size; i++, move++, new_data++)
00104 if (*move == TRANSPARENT)
00105 *new_data = transparent;
00106 else
00107 *new_data = *move;
00108
00109 gfi->transparent = transparent;
00110 return 1;
00111
00112 error:
00113 return 0;
00114 }
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Definition at line 158 of file gifunopt.c. References Gif_Stream::background, Gif_CalculateScreenSize(), Gif_DeleteArray, Gif_NewArray, Gif_Stream::global, i, Gif_Stream::images, Gif_Stream::nimages, Gif_Stream::screen_height, Gif_Stream::screen_width, TRANSPARENT, Gif_Image::transparent, u_int16_t, and unoptimize_image(). Referenced by input_stream().
00159 {
00160 int ok = 1;
00161 int i, size;
00162 u_int16_t *screen;
00163 u_int16_t background;
00164 Gif_Image *gfi;
00165
00166 if (gfs->nimages < 1) return 1;
00167 for (i = 0; i < gfs->nimages; i++)
00168 if (gfs->images[i]->local)
00169 return 0;
00170 if (!gfs->global)
00171 return 0;
00172
00173 Gif_CalculateScreenSize(gfs, 0);
00174 size = gfs->screen_width * gfs->screen_height;
00175
00176 screen = Gif_NewArray(u_int16_t, size);
00177 gfi = gfs->images[0];
00178 background = gfi->transparent >= 0 ? TRANSPARENT : gfs->background;
00179 for (i = 0; i < size; i++)
00180 screen[i] = background;
00181
00182 for (i = 0; i < gfs->nimages; i++)
00183 if (!unoptimize_image(gfs, gfs->images[i], screen))
00184 ok = 0;
00185
00186 Gif_DeleteArray(screen);
00187 return ok;
00188 }
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Definition at line 47 of file gifunopt.c. References Gif_Stream::background, Gif_Image::height, Gif_Stream::images, Gif_Image::left, move(), Gif_Stream::screen_height, Gif_Stream::screen_width, Gif_Image::top, TRANSPARENT, Gif_Image::transparent, u_int16_t, and Gif_Image::width. Referenced by unoptimize_image().
00048 {
00049 u_int16_t solid;
00050 int x, y;
00051 int w = gfi->width;
00052 int h = gfi->height;
00053 if (gfi->left + w > gfs->screen_width) w = gfs->screen_width - gfi->left;
00054 if (gfi->top + h > gfs->screen_height) h = gfs->screen_height - gfi->top;
00055
00056 if (gfi->transparent >= 0)
00057 solid = TRANSPARENT;
00058 else if (gfs->images[0]->transparent >= 0)
00059 solid = TRANSPARENT;
00060 else
00061 solid = gfs->background;
00062
00063 for (y = 0; y < h; y++) {
00064 u_int16_t *move = screen + gfs->screen_width * (y + gfi->top) + gfi->left;
00065 for (x = 0; x < w; x++, move++)
00066 *move = solid;
00067 }
00068 }
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Definition at line 27 of file gifunopt.c. References Gif_Image::height, Gif_Image::img, Gif_Image::left, move(), Gif_Stream::screen_height, Gif_Stream::screen_width, Gif_Image::top, Gif_Image::transparent, u_int16_t, and Gif_Image::width. Referenced by unoptimize_image().
00028 {
00029 int transparent = gfi->transparent;
00030 int x, y;
00031 int w = gfi->width;
00032 int h = gfi->height;
00033 if (gfi->left + w > gfs->screen_width) w = gfs->screen_width - gfi->left;
00034 if (gfi->top + h > gfs->screen_height) h = gfs->screen_height - gfi->top;
00035
00036 for (y = 0; y < h; y++) {
00037 u_int16_t *move = screen + gfs->screen_width * (y + gfi->top) + gfi->left;
00038 byte *line = gfi->img[y];
00039 for (x = 0; x < w; x++, move++, line++)
00040 if (*line != transparent)
00041 *move = *line;
00042 }
00043 }
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Definition at line 118 of file gifunopt.c. References create_image_data(), Gif_Image::disposal, Gif_DeleteArray, Gif_DeleteArrayFunc, GIF_DISPOSAL_BACKGROUND, GIF_DISPOSAL_PREVIOUS, Gif_NewArray, Gif_ReleaseCompressedImage(), Gif_SetUncompressedImage(), Gif_UncompressImage, Gif_Image::height, Gif_Image::left, put_background_in_screen(), put_image_in_screen(), Gif_Stream::screen_height, Gif_Stream::screen_width, Gif_Image::top, u_int16_t, and Gif_Image::width. Referenced by Gif_Unoptimize().
00119 {
00120 int size = gfs->screen_width * gfs->screen_height;
00121 byte *new_data = Gif_NewArray(byte, size);
00122 u_int16_t *new_screen = screen;
00123 if (!new_data) return 0;
00124
00125 /* Oops! May need to uncompress it */
00126 Gif_UncompressImage(gfi);
00127 Gif_ReleaseCompressedImage(gfi);
00128
00129 if (gfi->disposal == GIF_DISPOSAL_PREVIOUS) {
00130 new_screen = Gif_NewArray(u_int16_t, size);
00131 if (!new_screen) return 0;
00132 memcpy(new_screen, screen, size * sizeof(u_int16_t));
00133 }
00134
00135 put_image_in_screen(gfs, gfi, new_screen);
00136 if (!create_image_data(gfs, gfi, new_screen, new_data)) {
00137 Gif_DeleteArray(new_data);
00138 return 0;
00139 }
00140
00141 if (gfi->disposal == GIF_DISPOSAL_PREVIOUS)
00142 Gif_DeleteArray(new_screen);
00143 else if (gfi->disposal == GIF_DISPOSAL_BACKGROUND)
00144 put_background_in_screen(gfs, gfi, screen);
00145
00146 gfi->left = 0;
00147 gfi->top = 0;
00148 gfi->width = gfs->screen_width;
00149 gfi->height = gfs->screen_height;
00150 gfi->disposal = GIF_DISPOSAL_BACKGROUND;
00151 Gif_SetUncompressedImage(gfi, new_data, Gif_DeleteArrayFunc, 0);
00152
00153 return 1;
00154 }
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