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Attempt to decompile sub_679C4A

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This commit is contained in:
Marijn van der Werf
2016-02-26 20:51:55 +01:00
parent a0e08146bb
commit ce4590f914
1 changed files with 67 additions and 0 deletions
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67
src/interface/viewport.c
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@@ -2705,6 +2705,73 @@ void sub_679788(rct_g1_element *image, rct_drawpixelinfo *dpi) {
}
void sub_679C4A(rct_g1_element *image, uint8 *esi) {
uint8 *ebx = esi + *(esi + (_yStartPoint * 2));
uint8 last_data_line = 0;
while (!last_data_line) {
uint8 gap_size = *ebx++;
int no_pixels = *ebx++;
last_data_line = no_pixels & 0x80;
no_pixels &= 0x7F;
ebx += no_pixels;
if (gap_size & 1) {
gap_size++;
no_pixels--;
if (no_pixels == 0) {
continue;
}
}
// This is only done for one of the functions
int sub = 0x679C4A;
if (sub == 0x679C4A) {
if (gap_size & 2) {
gap_size += 2;
no_pixels -= 2;
if (no_pixels <= 0) {
continue;
}
}
}
int x_start = gap_size - _xStartPoint;
if (x_start <= 0) {
no_pixels += x_start;
if (no_pixels <= 0) {
continue;
}
x_start = 0;
} else {
// Do nothing?
}
x_start += no_pixels;
x_start--;
if (x_start > 0) {
no_pixels -= x_start;
if (no_pixels <= 0) {
continue;
}
}
// These differ per variant ( `+7)>>3`, `+1)>>1` or `+3)>>2` )
// Could be 'ceil2(n, 8)`, 'ceil2(n, 2)`, 'ceil2(n, 4)`
int pixel_offset = 3;
int shift_amount = 2;
no_pixels = (no_pixels + pixel_offset) >> shift_amount;
if (no_pixels != 0) {
RCT2_GLOBAL(0x141F569, uint8) = 1;
break;
}
}
}
/**
*
* rct2: 0x00679074