static void merge_zoomed_image_scale_down(Image* dst, const Image* src, const Palette* pal,
int x, int y, int opacity, int blend_mode, Zoom zoom)
{
BlenderHelper<DstTraits, SrcTraits> blender(src, pal, blend_mode);
int src_x, src_y, src_w, src_h;
int dst_x, dst_y, dst_w, dst_h;
int unbox_w, unbox_h;
int bottom;
unbox_w = zoom.remove(1);
unbox_h = zoom.remove(1);
src_x = 0;
src_y = 0;
src_w = src->width();
src_h = src->height();
dst_x = x;
dst_y = y;
dst_w = zoom.apply(src->width());
dst_h = zoom.apply(src->height());
// clipping...
if (dst_x < 0) {
src_x += zoom.remove(-dst_x);
src_w -= zoom.remove(-dst_x);
dst_w -= (-dst_x);
dst_x = 0;
}
if (dst_y < 0) {
src_y += zoom.remove(-dst_y);
src_h -= zoom.remove(-dst_y);
dst_h -= (-dst_y);
dst_y = 0;
}
if (dst_x+dst_w > dst->width()) {
src_w -= zoom.remove(dst_x+dst_w-dst->width());
dst_w = dst->width() - dst_x;
}
if (dst_y+dst_h > dst->height()) {
src_h -= zoom.remove(dst_y+dst_h-dst->height());
dst_h = dst->height() - dst_y;
}
src_w = zoom.remove(zoom.apply(src_w));
src_h = zoom.remove(zoom.apply(src_h));
if ((src_w <= 0) || (src_h <= 0) ||
(dst_w <= 0) || (dst_h <= 0))
return;
bottom = dst_y+dst_h-1;
// Lock all necessary bits
const LockImageBits<SrcTraits> srcBits(src, gfx::Rect(src_x, src_y, src_w, src_h));
LockImageBits<DstTraits> dstBits(dst, gfx::Rect(dst_x, dst_y, dst_w, dst_h));
typename LockImageBits<SrcTraits>::const_iterator src_it = srcBits.begin();
typename LockImageBits<SrcTraits>::const_iterator src_end = srcBits.end();
typename LockImageBits<DstTraits>::iterator dst_it, dst_end;
// For each line to draw of the source image...
for (y=0; y<src_h; y+=unbox_h) {
dst_it = dstBits.begin_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
dst_end = dstBits.end_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
for (x=0; x<src_w; x+=unbox_w) {
ASSERT(src_it >= srcBits.begin() && src_it < src_end);
ASSERT(dst_it >= dstBits.begin() && dst_it < dst_end);
blender(*dst_it, *dst_it, *src_it, opacity);
// Skip source pixels
for (int delta=0; delta < unbox_w && src_it != src_end; ++delta)
++src_it;
++dst_it;
}
if (++dst_y > bottom)
break;
// Skip lines
for (int delta=0; delta < src_w * (unbox_h-1) && src_it != src_end; ++delta)
++src_it;
}
}
static void merge_zoomed_image_scale_up(Image* dst, const Image* src, const Palette* pal,
int x, int y, int opacity, int blend_mode, Zoom zoom)
{
BlenderHelper<DstTraits, SrcTraits> blender(src, pal, blend_mode);
int src_x, src_y, src_w, src_h;
int dst_x, dst_y, dst_w, dst_h;
int box_x, box_y, box_w, box_h;
int first_box_w, first_box_h;
int line_h, bottom;
box_w = zoom.apply(1);
box_h = zoom.apply(1);
src_x = 0;
src_y = 0;
src_w = src->width();
src_h = src->height();
dst_x = x;
dst_y = y;
dst_w = zoom.apply(src->width());
dst_h = zoom.apply(src->height());
// clipping...
if (dst_x < 0) {
src_x += zoom.remove(-dst_x);
src_w -= zoom.remove(-dst_x);
dst_w -= (-dst_x);
first_box_w = box_w - ((-dst_x) % box_w);
dst_x = 0;
}
else
first_box_w = 0;
if (dst_y < 0) {
src_y += zoom.remove(-dst_y);
src_h -= zoom.remove(-dst_y);
dst_h -= (-dst_y);
first_box_h = box_h - ((-dst_y) % box_h);
dst_y = 0;
}
else
first_box_h = 0;
if (dst_x+dst_w > dst->width()) {
src_w -= zoom.remove(dst_x+dst_w-dst->width());
dst_w = dst->width() - dst_x;
}
if (dst_y+dst_h > dst->height()) {
src_h -= zoom.remove(dst_y+dst_h-dst->height());
dst_h = dst->height() - dst_y;
}
if ((src_w <= 0) || (src_h <= 0) ||
(dst_w <= 0) || (dst_h <= 0))
return;
bottom = dst_y+dst_h-1;
// the scanline variable is used to blend src/dst pixels one time for each pixel
typedef std::vector<typename DstTraits::pixel_t> Scanline;
Scanline scanline(src_w);
typename Scanline::iterator scanline_it;
#ifdef _DEBUG
typename Scanline::iterator scanline_end = scanline.end();
#endif
// Lock all necessary bits
const LockImageBits<SrcTraits> srcBits(src, gfx::Rect(src_x, src_y, src_w, src_h));
LockImageBits<DstTraits> dstBits(dst, gfx::Rect(dst_x, dst_y, dst_w, dst_h));
typename LockImageBits<SrcTraits>::const_iterator src_it = srcBits.begin();
#ifdef _DEBUG
typename LockImageBits<SrcTraits>::const_iterator src_end = srcBits.end();
#endif
typename LockImageBits<DstTraits>::iterator dst_it, dst_end;
// For each line to draw of the source image...
for (y=0; y<src_h; ++y) {
dst_it = dstBits.begin_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
dst_end = dstBits.end_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
// Read 'src' and 'dst' and blend them, put the result in `scanline'
scanline_it = scanline.begin();
for (x=0; x<src_w; ++x) {
ASSERT(src_it >= srcBits.begin() && src_it < src_end);
ASSERT(dst_it >= dstBits.begin() && dst_it < dst_end);
ASSERT(scanline_it >= scanline.begin() && scanline_it < scanline_end);
blender(*scanline_it, *dst_it, *src_it, opacity);
++src_it;
int delta;
if ((x == 0) && (first_box_w > 0))
delta = first_box_w;
else
delta = box_w;
while (dst_it != dst_end && delta-- > 0)
++dst_it;
++scanline_it;
}
// Get the 'height' of the line to be painted in 'dst'
if ((y == 0) && (first_box_h > 0))
line_h = first_box_h;
else
line_h = box_h;
// Draw the line in 'dst'
for (box_y=0; box_y<line_h; ++box_y) {
dst_it = dstBits.begin_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
dst_end = dstBits.end_area(gfx::Rect(dst_x, dst_y, dst_w, 1));
scanline_it = scanline.begin();
x = 0;
// first pixel
if (first_box_w > 0) {
for (box_x=0; box_x<first_box_w; ++box_x) {
ASSERT(scanline_it != scanline_end);
ASSERT(dst_it != dst_end);
*dst_it = *scanline_it;
++dst_it;
if (dst_it == dst_end)
goto done_with_line;
}
++scanline_it;
++x;
}
// the rest of the line
for (; x<src_w; ++x) {
for (box_x=0; box_x<box_w; ++box_x) {
ASSERT(dst_it != dst_end);
*dst_it = *scanline_it;
++dst_it;
if (dst_it == dst_end)
goto done_with_line;
}
++scanline_it;
}
done_with_line:;
if (++dst_y > bottom)
goto done_with_blit;
}
// go to the next line in the source image
++src_y;
}
done_with_blit:;
}