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Load_IFF() improve 4bits per component palettes

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Thomas Bernard 2018-03-01 19:27:32 +01:00
parent 975c343cd7
commit 144207f6d6
1 changed files with 18 additions and 0 deletions
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18
src/fileformats.c
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@ -1462,6 +1462,24 @@ void Load_IFF(T_IO_Context * context)
if (Read_bytes(IFF_file,context->Palette,3*nb_colors))
{
section_size -= 3*nb_colors;
if (nb_colors <= 64)
{
unsigned int i;
int is_4bits_colors = 1; // recoil also checks that header.Pad1 is not 0x80
for(i = 0; i < nb_colors && is_4bits_colors; i++)
{
is_4bits_colors = is_4bits_colors && ((context->Palette[i].R & 0x0f) == 0)
&& ((context->Palette[i].G & 0x0f) == 0)
&& ((context->Palette[i].B & 0x0f) == 0);
}
if (is_4bits_colors) // extend 4bits per component color palettes to 8bits per component
for(i = 0; i < nb_colors; i++)
{
context->Palette[i].R |= (context->Palette[i].R >> 4);
context->Palette[i].G |= (context->Palette[i].G >> 4);
context->Palette[i].B |= (context->Palette[i].B >> 4);
}
}
if (((nb_colors==32) || (AmigaViewModes & 0x80)) && (header.BitPlanes==6))
{
IFF_Set_EHB_Palette(context->Palette); // This is a Extra Half-Brite (EHB) 64 color image.