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mult_sub_image()

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This commit is contained in:
David Rose 2012-11-20 19:33:56 +00:00
parent 779fceafdd
commit b16e829044
2 changed files with 42 additions and 0 deletions
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38
panda/src/pnmimage/pnmImage.cxx
View File

@ -1007,6 +1007,44 @@ add_sub_image(const PNMImage &copy, int xto, int yto,
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::mult_sub_image
// Access: Published
// Description: Behaves like copy_sub_image(), except the copy pixels
// are multiplied to the pixels of the destination, after
// scaling by the specified pixel_scale. Unlike
// blend_sub_image(), the alpha channel is not treated
// specially.
////////////////////////////////////////////////////////////////////
void PNMImage::
mult_sub_image(const PNMImage &copy, int xto, int yto,
int xfrom, int yfrom, int x_size, int y_size,
double pixel_scale) {
int xmin, ymin, xmax, ymax;
setup_sub_image(copy, xto, yto, xfrom, yfrom, x_size, y_size,
xmin, ymin, xmax, ymax);
int x, y;
if (has_alpha() && copy.has_alpha()) {
for (y = ymin; y < ymax; y++) {
for (x = xmin; x < xmax; x++) {
set_alpha(x, y, get_alpha(x, y) * copy.get_alpha(x, y) * pixel_scale);
}
}
}
for (y = ymin; y < ymax; y++) {
for (x = xmin; x < xmax; x++) {
LRGBColord rgb1 = get_xel(x, y);
LRGBColord rgb2 = copy.get_xel(x, y);
set_xel(x, y,
rgb1[0] * rgb2[0] * pixel_scale,
rgb1[1] * rgb2[1] * pixel_scale,
rgb1[2] * rgb2[2] * pixel_scale);
}
}
}
////////////////////////////////////////////////////////////////////
// Function: PNMImage::darken_sub_image
// Access: Published

4
panda/src/pnmimage/pnmImage.h
View File

@ -204,6 +204,10 @@ PUBLISHED:
int xfrom = 0, int yfrom = 0,
int x_size = -1, int y_size = -1,
double pixel_scale = 1.0);
void mult_sub_image(const PNMImage &copy, int xto, int yto,
int xfrom = 0, int yfrom = 0,
int x_size = -1, int y_size = -1,
double pixel_scale = 1.0);
void darken_sub_image(const PNMImage &copy, int xto, int yto,
int xfrom = 0, int yfrom = 0,
int x_size = -1, int y_size = -1,