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Load_IFF() support CCRT color range chunck and read DRNG (but not implemented)

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Thomas Bernard 2018-12-14 15:56:47 +01:00
parent c86babeb35
commit 7a8b25ea4f
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1 changed files with 83 additions and 0 deletions
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83
src/fileformats.c
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@ -1608,6 +1608,89 @@ void Load_IFF(T_IO_Context * context)
else
File_error=47;
}
else if (memcmp(section, "DRNG", 4) == 0) // DPaint IV enhanced color cycle chunk
{
/// @todo DRNG IFF chunk is read, but complex color cycling are not implemented.
// see http://amigadev.elowar.com/read/ADCD_2.1/Devices_Manual_guide/node0282.html
byte min_col;
byte max_col;
word rate;
word flags;
byte ntruecolor;
byte nregs;
Read_byte(IFF_file, &min_col);
Read_byte(IFF_file, &max_col);
Read_word_be(IFF_file, &rate);
Read_word_be(IFF_file, &flags);
Read_byte(IFF_file, &ntruecolor);
Read_byte(IFF_file, &nregs);
section_size -= 8;
GFX2_Log(GFX2_DEBUG, "IFF DRNG : [#%u #%u] rate=%u flags=%04x, %u tc cells, %u reg cells\n", min_col, max_col, rate, flags, ntruecolor, nregs);
while (ntruecolor-- > 0 && section_size > 0)
{
byte cell, r, g, b;
Read_byte(IFF_file, &cell);
Read_byte(IFF_file, &r);
Read_byte(IFF_file, &g);
Read_byte(IFF_file, &b);
section_size -= 4;
GFX2_Log(GFX2_DEBUG, " #%u #%02X%02X%02X\n", cell, r, g, b);
}
while (nregs-- > 0 && section_size > 0)
{
byte cell, index;
Read_byte(IFF_file, &cell);
Read_byte(IFF_file, &index);
section_size -= 2;
GFX2_Log(GFX2_DEBUG, " #%u index %u\n", cell, index);
}
if (section_size > 0)
{
GFX2_Log(GFX2_DEBUG, "IFF DRNG : skipping %u bytes\n", section_size);
fseek(IFF_file, section_size, SEEK_CUR);
}
}
else if (memcmp(section, "CCRT", 4) == 0) // Color Cycling Range and Timing
{
// see http://amigadev.elowar.com/read/ADCD_2.1/Devices_Manual_guide/node01BA.html
word direction;
byte start, end;
dword seconds, microseconds;
word pad;
Read_word_be(IFF_file, &direction);
Read_byte(IFF_file, &start);
Read_byte(IFF_file, &end);
Read_dword_be(IFF_file, &seconds);
Read_dword_be(IFF_file, &microseconds);
Read_word_be(IFF_file, &pad);
section_size -= 14;
GFX2_Log(GFX2_DEBUG, "IFF CCRT : dir %04x [#%u #%u] delay %u.%06u\n",
direction, start, end, seconds, microseconds);
if (context->Color_cycles >= 16)
{
GFX2_Log(GFX2_INFO, "IFF CCRT : Maximum CRNG number is 16\n");
}
else if (start != end)
{
// Speed resolution is 0.2856Hz
// Speed = (1000000/delay) / 0.2856 = 3501400 / delay
context->Cycle_range[context->Color_cycles].Start = start;
context->Cycle_range[context->Color_cycles].End = end;
if (direction != 0)
{
context->Cycle_range[context->Color_cycles].Inverse = (~direction >> 15) & 1;
context->Cycle_range[context->Color_cycles].Speed = 3501400 / (seconds * 1000000 + microseconds);
}
else
{
context->Cycle_range[context->Color_cycles].Speed = 0;
}
context->Color_cycles++;
}
}
else if (memcmp(section, "CAMG", 4) == 0) // Amiga Viewport Modes
{
Read_dword_be(IFF_file, &AmigaViewModes); // HIRES=0x8000 LACE=0x4 HAM=0x800 HALFBRITE=0x80