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better clipping for left/top sides

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svn-id: r47098
This commit is contained in:
Vladimir Menshakov 2010-01-06 21:16:11 +00:00
parent d2978e3d92
commit 1779a44882
1 changed files with 18 additions and 11 deletions
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29
engines/teenagent/surface.cpp
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@ -69,12 +69,16 @@ Common::Rect Surface::render(Graphics::Surface *surface, int dx, int dy, bool mi
{
int left = x + dx, right = left + src_rect.width();
int top = y + dy, bottom = top + src_rect.height();
if (left < 0)
src_rect.left -= left;
if (left < 0) {
src_rect.left = -left;
dx = -x;
}
if (right > surface->w)
src_rect.right -= right - surface->w;
if (top < 0)
if (top < 0) {
src_rect.top -= top;
dy = -y;
}
if (bottom > surface->h)
src_rect.bottom -= bottom - surface->h;
if (src_rect.isEmpty())
@ -82,19 +86,22 @@ Common::Rect Surface::render(Graphics::Surface *surface, int dx, int dy, bool mi
}
if (zoom == 256) {
assert(x + dx + src_rect.width() <= surface->w);
assert(y + dy + src_rect.height() <= surface->h);
assert(x + dx >= 0 && x + dx + src_rect.width() <= surface->w);
assert(y + dy >= 0 && y + dy + src_rect.height() <= surface->h);
byte *src = (byte *)getBasePtr(src_rect.left, src_rect.top);
byte *dst = (byte *)surface->getBasePtr(dx + x, dy + y);
byte *src = (byte *)getBasePtr(0, src_rect.top);
byte *dst_base = (byte *)surface->getBasePtr(dx + x, dy + y);
for (int i = src_rect.top; i < src_rect.bottom; ++i) {
for (int j = 0; j < src_rect.width(); ++j) {
byte p = src[j];
byte *dst = dst_base;
for (int j = src_rect.left; j < src_rect.right; ++j) {
byte p = src[(mirror? w - j - 1: j)];
if (p != 0xff)
dst[(mirror? src_rect.width() - j - 1: j)] = p;
*dst++ = p;
else
++dst;
}
dst += surface->pitch;
dst_base += surface->pitch;
src += pitch;
}
src_rect.translate(x + dx, y + dy);