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Load_IFF() : parse SHAM (Sliced-HAM) chunks

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This commit is contained in:
Thomas Bernard 2018-02-02 11:42:31 +01:00
parent c5ea5d3a46
commit 38c9e3e2cf
1 changed files with 34 additions and 0 deletions
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34
src/fileformats.c
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@ -678,6 +678,8 @@ void Load_IFF(T_IO_Context * context)
dword AmigaViewModes = 0;
enum PIXEL_RATIO ratio = PIXEL_SIMPLE;
byte * buffer;
T_Components * SHAM_palettes = NULL;
unsigned SHAM_palette_count = 0;
Get_full_filename(filename, context->File_name, context->File_directory);
@ -843,6 +845,36 @@ void Load_IFF(T_IO_Context * context)
{
fseek(IFF_file, (section_size+1)&~1, SEEK_CUR); // Skip it
}
else if (memcmp(section, "SHAM", 4) == 0) // Sliced HAM
{
word version;
Read_word_be(IFF_file, &version); // always 0
section_size -= 2;
SHAM_palette_count = section_size >> 5; // 32 bytes per palette (16 colors * 2 bytes)
// SHAM_palette_count should be the image height, or height/2 for "interlaced" images
SHAM_palettes = malloc(sizeof(T_Components)*16*SHAM_palette_count);
if (SHAM_palettes == NULL)
{
Warning("Memory allocation error");
File_error = 1;
break;
}
for (counter = 0; (unsigned)counter < 16*SHAM_palette_count; counter++)
{
Read_byte(IFF_file, &temp_byte); // 0R
SHAM_palettes[counter].R = (temp_byte & 0x0f) * 0x11; // 4 bits to 8 bits
Read_byte(IFF_file, &temp_byte); // GB
SHAM_palettes[counter].G = (temp_byte & 0xf0) | (temp_byte >> 4);
SHAM_palettes[counter].B = (temp_byte & 0x0f) * 0x11; // 4 bits to 8 bits
section_size -= 2;
}
if (section_size > 0)
{
Warning("Extra bytes at the end of SHAM chunk");
fseek(IFF_file, (section_size+1)&~1, SEEK_CUR);
}
}
else if (memcmp(section, "TINY", 4) == 0)
{
word tiny_width, tiny_height;
@ -1085,6 +1117,8 @@ printf("%d x %d = %d %d\n", tiny_width, tiny_height, tiny_width*tiny_height, s
}
else
File_error=1;
if (SHAM_palettes)
free(SHAM_palettes);
}