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fixed resample_persever_aspect

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git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@158 0fc631ac-6414-0410-93d0-97cfa31319b6
This commit is contained in:
twanvl
2006-12-23 21:04:09 +00:00
parent 323a310de8
commit 3883251961
1 changed files with 19 additions and 4 deletions
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src/gfx/resample_image.cpp
+19 -4
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@@ -141,10 +141,25 @@ void resample_and_clip(const Image& img_in, Image& img_out, wxRect rect) {
// ----------------------------------------------------------------------------- : Aspect ratio preserving
// fill an image with 100% transparent
void fill_transparent(Image& img) {
// fill an image with 100% transparent, except for the given rectangle
void fill_transparent(Image& img, int dx, int dy, int w, int h) {
if (!img.HasAlpha()) img.InitAlpha();
memset(img.GetAlpha(), 0, img.GetWidth() * img.GetHeight());
int iw = img.GetWidth(), ih = img.GetHeight();
Byte* data = img.GetAlpha();
// fill
int y = 0;
for (; y < dy ; ++y) {
for (int x = 0 ; x < iw ; ++x) *data++ = 0;
}
for (; y < dy + h ; ++y) {
int x = 0;
for (; x < dx ; ++x) *data++ = 0;
for (; x < dx + w ; ++x) *data++ = 255;
for (; x < iw ; ++x) *data++ = 0;
}
for (; y < ih ; ++y) {
for (int x = 0 ; x < iw ; ++x) *data++ = 0;
}
}
void resample_preserve_aspect(const Image& img_in, Image& img_out) {
@@ -157,7 +172,7 @@ void resample_preserve_aspect(const Image& img_in, Image& img_out) {
int dx = (img_out.GetWidth() - rwidth) / 2;
int dy = (img_out.GetHeight() - rheight) / 2;
// transparent background
fill_transparent(img_out);
fill_transparent(img_out, dx, dy, rwidth, rheight);
// resample
int offset_out = dx + img_out.GetWidth() * dy;
Image img_temp(rwidth, img_in.GetHeight(), false);