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Implemented sharpening for image slicer

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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@241 0fc631ac-6414-0410-93d0-97cfa31319b6
This commit is contained in:
twanvl
2007-03-29 14:45:59 +00:00
parent 0f48513684
commit 30b38d6fab
3 changed files with 70 additions and 4 deletions
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src/gfx/resample_image.cpp
+59
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@@ -165,3 +165,62 @@ void resample_preserve_aspect(const Image& img_in, Image& img_out) {
resample_pass(img_in, img_temp, 0, 0, img_in.GetWidth(), 1, rwidth, 1, img_in.GetHeight(), img_in.GetWidth(), img_temp.GetWidth());
resample_pass(img_temp, img_out, 0, offset_out, img_in.GetHeight(), img_temp.GetWidth(), rheight, img_out.GetWidth(), rwidth, 1, 1);
}
// ----------------------------------------------------------------------------- : Sharpening
void sharp_downsample(const Image& img_in, Image& img_out, int amount);
void sharp_resample(const Image& img_in, Image& img_out, int amount) {
sharp_resample_and_clip(img_in, img_out, wxRect(0, 0, img_in.GetWidth(), img_in.GetHeight()), amount);
}
void sharp_resample_and_clip(const Image& img_in, Image& img_out, wxRect rect, int amount) {
Image img_larger(img_out.GetWidth() * 2, img_out.GetHeight() * 2, false);
resample_and_clip(img_in, img_larger, rect);
sharp_downsample(img_larger, img_out, amount);
}
// Downsample an image to create a sharp result by applying a sharpening filter
// img_in must be twice as large as img_out
void sharp_downsample(const Image& img_in, Image& img_out, int amount) {
assert(img_in.GetWidth() == img_out.GetWidth() * 2);
assert(img_in.GetHeight() == img_out.GetHeight() * 2);
int width = img_out.GetWidth(), height = img_out.GetHeight();
int line = width * 6;
int center_weight = 201;
int border_weight = amount;
assert(4 * center_weight - 8 * border_weight > 0);
Byte *in = img_in.GetData(), *out = img_out.GetData();
for (int y = 0 ; y < height ; ++y) {
for (int x = 0 ; x < width ; ++x) {
for (int c = 0 ; c < 3 ; ++c) { // for each component
// Filter using a kernel of the form
/* -1 -1
* -1 c c -1
* -1 c c -1
* -1 -1
* But when we are near the edge replicate the edge pixel
*/
int tot =
center_weight * (in[0] + in[3] + in[line] + in[line+3]) - // center
border_weight * (
(x == 0 ? in[0] + in[line] : in[-3] + in[line-3]) + // left
(x+1 == width ? in[3] + in[line+3] : in[6] + in[line+6]) + // right
(y == 0 ? in[0] + in[3] : in[-line] + in[3-line]) + // top
(y+1 == height ? in[line] + in[line+3] : in[line*2] + in[line*2+3]) );// bottom
// And then avarage the result into a single pixel (downsample by factor 2)
out[0] = col( tot / (4 * center_weight - 8 * border_weight) );
// next pixel
++in;
++out;
}
// skip a pixel
in += 3;
}
// skip a line
in += line;
}
}