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scale images down to the available surface size

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This commit is contained in:
Dana Jansens 2003-02-13 22:45:11 +00:00
parent 576f03f629
commit 8446eaedc7
1 changed files with 22 additions and 3 deletions
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25
otk/rendercontrol.cc
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@ -452,11 +452,31 @@ void RenderControl::drawImage(Surface &sf, int w, int h,
if (y < 0) y = 0;
// XXX SCALING!@!&*(@! to make it fit on the surface
int orgw = w;
int oldw = w, oldh = h;
unsigned long *olddata = data;
if (w > sfw) w = sfw;
if (h > sfh) h = sfh;
unsigned long newdata[w*h];
if (w < oldw || h < oldh) {
double dx = oldw / (double)w;
double dy = oldh / (double)h;
double px = 0.0;
double py = 0.0;
int iy = 0;
for (i = 0, c = 0, e = w*h; i < e; ++i) {
newdata[i] = olddata[(int)px + iy];
if (++c >= w) {
c = 0;
px = 0;
py += dy;
iy = (int)py * oldw;
} else
px += dx;
}
data = newdata;
}
for (i = 0, c = 0, bgi = y * sfw + x, e = orgw*h; i < e; ++i, ++bgi) {
for (i = 0, c = 0, bgi = y * sfw + x, e = w*h; i < e; ++i, ++bgi) {
unsigned char alpha = data[i] >> 24;
unsigned char r = data[i] >> 16;
unsigned char g = data[i] >> 8;
@ -477,7 +497,6 @@ void RenderControl::drawImage(Surface &sf, int w, int h,
if (++c >= w) {
c = 0;
bgi += sfw - w;
i += orgw - w;
}
}