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Save_IFF(): save CAMG chunk and detect EHB

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Extra Half Bright

see http://pulkomandy.tk/projects/GrafX2/ticket/134
This commit is contained in:
Thomas Bernard 2019-06-09 02:03:13 +02:00
parent 0d821b178b
commit 41e25d2204
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GPG Key ID: 0FF11B67A5C0863C
1 changed files with 33 additions and 3 deletions
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36
src/fileformats.c
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@ -2296,6 +2296,7 @@ void Save_IFF(T_IO_Context * context)
int palette_entries;
byte bit_depth;
long body_offset = -1;
int is_ehb = 0; // Extra half-bright
if (context->Format == FORMAT_LBM)
{
@ -2310,13 +2311,26 @@ void Save_IFF(T_IO_Context * context)
bit_depth++;
temp_byte>>=1;
} while (temp_byte);
GFX2_Log(GFX2_DEBUG, "Saving ILBM with bit_depth = %d\n", bit_depth);
if (bit_depth == 6)
{
for (i = 0; i < 32; i++)
{
if ( (context->Palette[i].R >> 5) != (context->Palette[i+32].R >> 4)
|| (context->Palette[i].G >> 5) != (context->Palette[i+32].G >> 4)
|| (context->Palette[i].B >> 5) != (context->Palette[i+32].B >> 4))
break;
}
if (i == 32) is_ehb = 1;
}
GFX2_Log(GFX2_DEBUG, "Saving ILBM with bit_depth = %d %s\n", bit_depth,
is_ehb ? "(Extra Half-Bright)" : "");
palette_entries = 1 << (bit_depth - is_ehb);
}
else // FORMAT_PBM
{
bit_depth=8;
bit_depth = 8;
palette_entries = 256;
}
palette_entries = 1<<bit_depth;
File_error=0;
@ -2386,6 +2400,22 @@ void Save_IFF(T_IO_Context * context)
Write_word_be(IFF_file,header.X_screen);
Write_word_be(IFF_file,header.Y_screen);
if (context->Format == FORMAT_LBM)
{
dword ViewMode = 0; // HIRES=0x8000 LACE=0x4 HAM=0x800 HALFBRITE=0x80
if (is_ehb) ViewMode |= 0x80;
if (context->Width > 400)
{
ViewMode |= 0x8000;
if (context->Width > 800)
ViewMode |= 0x20; // Super High-Res
}
if (context->Height > 300) ViewMode |= 0x4;
Write_bytes(IFF_file, "CAMG", 4);
Write_dword_be(IFF_file, 4); // Section size
Write_dword_be(IFF_file, ViewMode);
}
Write_bytes(IFF_file,"CMAP",4);
Write_dword_be(IFF_file,palette_entries*3);