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decompiled sub_683359

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kmdreko
2015-11-02 23:30:48 -06:00
parent 273293456c
commit 1293325699
1 changed files with 48 additions and 7 deletions
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55
src/interface/viewport.c
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@@ -270,15 +270,56 @@ void sub_689174(sint16* x, sint16* y, sint16 *z)
*z = height;
}
// ax = viewport->x
// bx = viewport->y;
// cx = viewport->width;
// dx = viewport->height;
void sub_683326(int left, int top, int right, int bottom)
{
RCT2_CALLPROC_X(0x00683359, left, top, right, bottom, 0, 0, 0);
}
// shifts pixels from the region in a direction. Used when a viewport moves;
// consider putting in src/drawing/drawing.c or src/drawing/rect.c
//
// 0x00683359
// ax = x
// bx = y;
// cx = width;
// dx = height;
// di = dx;
// si = dy;
void sub_683359(int x, int y, int width, int height, int dx, int dy)
void gfx_move_screen_rect(int x, int y, int width, int height, int dx, int dy)
{
RCT2_CALLPROC_X(0x00683359, x, y, width, height, dy, dx, 0);
// nothing to do
if (dx == 0 && dy == 0)
return;
// I have seen no advantages of having this function nor disadvantages from
// leaving it out. Kept in for completeness
sub_683326(x, y, x + width - 1, y + height - 1);
// get screen info
rct_drawpixelinfo *screenDPI = RCT2_ADDRESS(RCT2_ADDRESS_SCREEN_DPI, rct_drawpixelinfo);
sint32 stride = screenDPI->width + screenDPI->pitch;
uint8* to = screenDPI->bits + y * stride + x;
uint8* from = screenDPI->bits + (y - dy) * stride + x - dx;
if (dy > 0)
{
// if positive dy, reverse directions
to += (height - 1) * stride;
from += (height - 1) * stride;
stride = -stride;
}
// move bits
for (int i = 0; i < height; i++, to += stride, from += stride)
{
// when zooming, there can be x, y, dx, dy combinations that go off the
// screen; hence the condition. This code should ultimately not be
// called when zooming because this function is specific to updating the
// screen on move
if (from >= screenDPI->bits && from + width < screenDPI->bits + RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_WIDTH, uint16) * RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_HEIGHT, uint16))
memmove(to, from, width);
}
}
void sub_6E7FF3(rct_window *window, rct_viewport *viewport, int x, int y)
@@ -361,7 +402,7 @@ void sub_6E7FF3(rct_window *window, rct_viewport *viewport, int x, int y)
if (abs(x) < viewport->width && abs(y) < viewport->height)
{
// update whole block ?
sub_683359(viewport->x, viewport->y, viewport->width, viewport->height, x, y);
gfx_move_screen_rect(viewport->x, viewport->y, viewport->width, viewport->height, x, y);
if (x > 0)
{