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pnmimage: Add an additive PNMPainter brush

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rdb 2022-01-10 12:59:51 +01:00
parent 40f54a766c
commit 6777f19162
2 changed files with 51 additions and 4 deletions
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54
panda/src/pnmimage/pnmBrush.cxx
View File

@ -142,6 +142,32 @@ public:
}
};
// Adds a value to the pixel.
class EXPCL_PANDA_PNMIMAGE PNMAddPixelBrush : public PNMPixelBrush {
public:
PNMAddPixelBrush(const LColorf &color) : PNMPixelBrush(color) { }
virtual void draw(PNMImage &image, int x, int y, float pixel_scale) {
if (x >= 0 && x < image.get_x_size() &&
y >= 0 && y < image.get_y_size()) {
image.set_xel_a(x, y,
image.get_xel_a(x, y) + (_color * pixel_scale));
}
}
virtual void fill(PNMImage &image, int xfrom, int xto, int y,
int xo, int yo) {
if (y >= 0 && y < image.get_y_size()) {
xfrom = max(xfrom, 0);
xto = max(xto, image.get_x_size() - 1);
for (int x = xfrom; x <= xto; ++x) {
image.set_xel_a(x, y,
image.get_xel_a(x, y) + _color);
}
}
}
};
// A PNMImageBrush is a family of brushes that draw an image at a time.
class EXPCL_PANDA_PNMIMAGE PNMImageBrush : public PNMBrush {
protected:
@ -244,6 +270,22 @@ public:
}
};
// Adds a constant value to the pixels
class EXPCL_PANDA_PNMIMAGE PNMAddImageBrush : public PNMImageBrush {
public:
PNMAddImageBrush(const PNMImage &image, float xc, float yc) :
PNMImageBrush(image, xc, yc) { }
virtual void draw(PNMImage &image, int x, int y, float pixel_scale) {
image.add_sub_image(_image, x, y, 0, 0, -1, -1, pixel_scale);
}
virtual void do_scanline(PNMImage &image, int xto, int yto,
int xfrom, int yfrom, int x_size, int y_size) {
image.add_sub_image(_image, xto, yto, xfrom, yfrom, x_size, y_size);
}
};
/**
*
*/
@ -278,6 +320,9 @@ make_pixel(const LColorf &color, PNMBrush::BrushEffect effect) {
case BE_lighten:
return new PNMLightenPixelBrush(color);
case BE_add:
return new PNMAddPixelBrush(color);
}
pnmimage_cat.error()
@ -296,6 +341,8 @@ make_spot(const LColorf &color, float radius, bool fuzzy,
switch (effect) {
case BE_set:
case BE_lighten:
case BE_add:
bg.set(0, 0, 0, 0);
break;
@ -307,10 +354,6 @@ make_spot(const LColorf &color, float radius, bool fuzzy,
bg.set(1, 1, 1, 1);
break;
case BE_lighten:
bg.set(0, 0, 0, 0);
break;
default:
pnmimage_cat.error()
<< "**Invalid BrushEffect (" << (int)effect << ")**\n";
@ -351,6 +394,9 @@ make_image(const PNMImage &image, float xc, float yc,
case BE_lighten:
return new PNMLightenImageBrush(image, xc, yc);
case BE_add:
return new PNMAddImageBrush(image, xc, yc);
}
pnmimage_cat.error()

1
panda/src/pnmimage/pnmBrush.h
View File

@ -45,6 +45,7 @@ PUBLISHED:
BE_blend,
BE_darken,
BE_lighten,
BE_add,
};
static PT(PNMBrush) make_transparent();