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PCX : the CGA "color burst" bit is not taken into account by Paintbrush 3.11

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This commit is contained in:
Thomas Bernard 2018-01-20 11:56:03 +01:00
parent 34c7f96535
commit afb1feb75d
1 changed files with 11 additions and 11 deletions
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22
src/fileformats.c
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@ -3665,12 +3665,12 @@ void Load_PCX(T_IO_Context * context)
if (PCX_header.Version < 5 // Detect if the palette is usable
|| (nb_colors == 4
&& PCX_header.Palette_16c[6] == 0
&& PCX_header.Palette_16c[7] == 0
&& PCX_header.Palette_16c[8] == 0
&& PCX_header.Palette_16c[9] == 0
&& PCX_header.Palette_16c[10] == 0
&& PCX_header.Palette_16c[11] == 0)
&& (PCX_header.Palette_16c[6]&15) == 0
&& (PCX_header.Palette_16c[7]&15) == 0
&& (PCX_header.Palette_16c[8]&15) == 0
&& (PCX_header.Palette_16c[9]&15) == 0
&& (PCX_header.Palette_16c[10]&15) == 0
&& (PCX_header.Palette_16c[11]&15) == 0)
|| (nb_colors == 2
&& PCX_header.Palette_16c[1] == 0
&& PCX_header.Palette_16c[2] == 0))
@ -3678,7 +3678,6 @@ void Load_PCX(T_IO_Context * context)
// special CGA palette meaning :
if (nb_colors == 2)
{
printf("CGA background = #%X\n", PCX_header.Palette_16c[0] >> 4);
// Background : BLACK
context->Palette[0].R=0;
context->Palette[0].G=0;
@ -3700,15 +3699,16 @@ printf("CGA background = #%X\n", PCX_header.Palette_16c[0] >> 4);
// CGA Palette 0 : 2 green, 4 red, 6 brown
// CGA Palette 1 : 3 cyan, 5 magenta, 7 white
// CGA 3rd palette : 3 cyan, 4 red, 7 white
// After some tests in PC Paintbrush 3.11, it looks like
// the Color burst bit is not taken into acount.
i = 2; // 2 - CGA Green
if (PCX_header.Palette_16c[3] & 0x40 || !(PCX_header.Palette_16c[3] & 0x80))
i++; // Palette 1 or 3rd palette (cyan)
if (PCX_header.Palette_16c[3] & 0x40)
i++; // Palette 1 (3 = cyan)
if (PCX_header.Palette_16c[3] & 0x20)
i += 8; // High intensity
Set_CGA_Color(i++, &context->Palette[1]);
if (PCX_header.Palette_16c[3] & 0x80) i++; // Skip 1 color
i++; // Skip 1 color
Set_CGA_Color(i++, &context->Palette[2]);
if (!(PCX_header.Palette_16c[3] & 0x80)) i++; // Skip 1 color
i++; // Skip 1 color
Set_CGA_Color(i, &context->Palette[3]);
}