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Fix code to optimize sub-picture saving in GIF code

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Thomas Bernard 2018-12-13 00:49:18 +01:00
parent 0f098d8b84
commit 003fbcfc1b
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GPG Key ID: 0FF11B67A5C0863C
1 changed files with 19 additions and 8 deletions
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27
src/fileformats.c
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@ -4903,23 +4903,31 @@ void Save_GIF(T_IO_Context * context)
// find bounding box of changes for Animated GIFs
min_X = min_Y = 0xffff;
max_X = max_Y = 0;
temp = LSDB.Backcol;//=context->Transparent_color;
for(GIF_pos_Y = 0; GIF_pos_Y < context->Height; GIF_pos_Y++) {
for(GIF_pos_X = 0; GIF_pos_X < context->Width; GIF_pos_X++) {
if (GIF_pos_X >= min_X && GIF_pos_X <= max_X && GIF_pos_Y >= min_Y && GIF_pos_Y <= max_Y)
continue; // already in the box
// compare Pixel from previous layer or from background depending on disposal method
if(disposal_method == DISPOSAL_METHOD_DO_NOT_DISPOSE) {
if(disposal_method == DISPOSAL_METHOD_DO_NOT_DISPOSE)
{
// if that pixel has same value in previous layer, no need to save it
Set_saving_layer(context, current_layer - 1);
temp = Get_pixel(context, GIF_pos_X, GIF_pos_Y);
Set_saving_layer(context, current_layer);
if(temp == Get_pixel(context, GIF_pos_X, GIF_pos_Y))
continue;
}
if(temp != Get_pixel(context, GIF_pos_X, GIF_pos_Y)) {
if(GIF_pos_X < min_X) min_X = GIF_pos_X;
if(GIF_pos_X > max_X) max_X = GIF_pos_X;
if(GIF_pos_Y < min_Y) min_Y = GIF_pos_Y;
if(GIF_pos_Y > max_Y) max_Y = GIF_pos_Y;
if (disposal_method == DISPOSAL_METHOD_RESTORE_BGCOLOR
|| context->Background_transparent
|| Main.backups->Pages->Image_mode != IMAGE_MODE_ANIMATION)
{
// if that pixel is Backcol, no need to save it
if (LSDB.Backcol == Get_pixel(context, GIF_pos_X, GIF_pos_Y))
continue;
}
if(GIF_pos_X < min_X) min_X = GIF_pos_X;
if(GIF_pos_X > max_X) max_X = GIF_pos_X;
if(GIF_pos_Y < min_Y) min_Y = GIF_pos_Y;
if(GIF_pos_Y > max_Y) max_Y = GIF_pos_Y;
}
}
if((min_X <= max_X) && (min_Y <= max_Y))
@ -4949,6 +4957,9 @@ void Save_GIF(T_IO_Context * context)
while((int)max >= (1 << IDB.Nb_bits_pixel)) {
IDB.Nb_bits_pixel++;
}
GFX2_Log(GFX2_DEBUG, "GIF image #%d %ubits (%u,%u) %ux%u\n",
current_layer, IDB.Nb_bits_pixel, IDB.Pos_X, IDB.Pos_Y,
IDB.Image_width, IDB.Image_height);
// On va écrire un block indicateur d'IDB et l'IDB du fichier
block_identifier=0x2C;