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Add additional texture modifiers (#10100)
* Adjust hue, saturation, and lightness * Colorize using hue, saturation, and lightness * Adjust contrast & brightness * Hard light * Overlay * Screen * Create texture of a given size and color
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doc/lua_api.md
111
doc/lua_api.md
@ -594,6 +594,29 @@ Example:
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Creates an inventorycube with `grass.png`, `dirt.png^grass_side.png` and
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`dirt.png^grass_side.png` textures
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#### `[fill:<w>x<h>:<x>,<y>:<color>`
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* `<w>`: width
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* `<h>`: height
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* `<x>`: x position
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* `<y>`: y position
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* `<color>`: a `ColorString`.
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Creates a texture of the given size and color, optionally with an <x>,<y>
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position. An alpha value may be specified in the `Colorstring`.
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The optional <x>,<y> position is only used if the [fill is being overlaid
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onto another texture with '^'.
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When [fill is overlaid onto another texture it will not upscale or change
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the resolution of the texture, the base texture will determine the output
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resolution.
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Examples:
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[fill:16x16:#20F02080
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texture.png^[fill:8x8:4,4:red
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#### `[lowpart:<percent>:<file>`
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Blit the lower `<percent>`% part of `<file>` on the texture.
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@ -628,7 +651,7 @@ which it assumes to be a tilesheet with dimensions w,h.
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Colorize the textures with the given color.
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`<color>` is specified as a `ColorString`.
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`<ratio>` is an int ranging from 0 to 255 or the word "`alpha`". If
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`<ratio>` is an int ranging from 0 to 255 or the word "`alpha`". If
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it is an int, then it specifies how far to interpolate between the
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colors where 0 is only the texture color and 255 is only `<color>`. If
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omitted, the alpha of `<color>` will be used as the ratio. If it is
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@ -636,6 +659,22 @@ the word "`alpha`", then each texture pixel will contain the RGB of
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`<color>` and the alpha of `<color>` multiplied by the alpha of the
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texture pixel.
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#### `[colorizehsl:<hue>:<saturation>:<lightness>`
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Colorize the texture to the given hue. The texture will be converted into a
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greyscale image as seen through a colored glass, like "Colorize" in GIMP.
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Saturation and lightness can optionally be adjusted.
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`<hue>` should be from -180 to +180. The hue at 0° on an HSL color wheel is
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red, 60° is yellow, 120° is green, and 180° is cyan, while -60° is magenta
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and -120° is blue.
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`<saturation>` and `<lightness>` are optional adjustments.
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`<lightness>` is from -100 to +100, with a default of 0
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`<saturation>` is from 0 to 100, with a default of 50
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#### `[multiply:<color>`
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Multiplies texture colors with the given color.
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@ -644,6 +683,76 @@ Result is more like what you'd expect if you put a color on top of another
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color, meaning white surfaces get a lot of your new color while black parts
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don't change very much.
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A Multiply blend can be applied between two textures by using the overlay
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modifier with a brightness adjustment:
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textureA.png^[contrast:0:-64^[overlay:textureB.png
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#### `[screen:<color>`
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Apply a Screen blend with the given color. A Screen blend is the inverse of
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a Multiply blend, lightening images instead of darkening them.
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`<color>` is specified as a `ColorString`.
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A Screen blend can be applied between two textures by using the overlay
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modifier with a brightness adjustment:
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textureA.png^[contrast:0:64^[overlay:textureB.png
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#### `[hsl:<hue>:<saturation>:<lightness>`
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Adjust the hue, saturation, and lightness of the texture. Like
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"Hue-Saturation" in GIMP, but with 0 as the mid-point.
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`<hue>` should be from -180 to +180
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`<saturation>` and `<lightness>` are optional, and both percentages.
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`<lightness>` is from -100 to +100.
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`<saturation>` goes down to -100 (fully desaturated) but may go above 100,
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allowing for even muted colors to become highly saturated.
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#### `[contrast:<contrast>:<brightness>`
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Adjust the brightness and contrast of the texture. Conceptually like
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GIMP's "Brightness-Contrast" feature but allows brightness to be wound
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all the way up to white or down to black.
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`<contrast>` is a value from -127 to +127.
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`<brightness>` is an optional value, from -127 to +127.
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If only a boost in contrast is required, an alternative technique is to
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hardlight blend the texture with itself, this increases contrast in the same
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way as an S-shaped color-curve, which avoids dark colors clipping to black
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and light colors clipping to white:
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texture.png^[hardlight:texture.png
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#### `[overlay:<file>`
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Applies an Overlay blend with the two textures, like the Overlay layer mode
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in GIMP. Overlay is the same as Hard light but with the role of the two
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textures swapped, see the `[hardlight` modifier description for more detail
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about these blend modes.
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#### `[hardlight:<file>`
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Applies a Hard light blend with the two textures, like the Hard light layer
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mode in GIMP.
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Hard light combines Multiply and Screen blend modes. Light parts of the
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`<file>` texture will lighten (screen) the base texture, and dark parts of the
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`<file>` texture will darken (multiply) the base texture. This can be useful
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for applying embossing or chiselled effects to textures. A Hard light with the
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same texture acts like applying an S-shaped color-curve, and can be used to
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increase contrast without clipping.
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Hard light is the same as Overlay but with the roles of the two textures
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swapped, i.e. `A.png^[hardlight:B.png` is the same as `B.png^[overlay:A.png`
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#### `[png:<base64>`
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Embed a base64 encoded PNG image in the texture string.
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@ -556,6 +556,32 @@ static void apply_colorize(video::IImage *dst, v2u32 dst_pos, v2u32 size,
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static void apply_multiplication(video::IImage *dst, v2u32 dst_pos, v2u32 size,
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const video::SColor &color);
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// Perform a Screen blend with the given color. The opposite effect of a
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// Multiply blend.
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static void apply_screen(video::IImage *dst, v2u32 dst_pos, v2u32 size,
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const video::SColor &color);
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// Adjust the hue, saturation, and lightness of destination. Like
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// "Hue-Saturation" in GIMP.
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// If colorize is true then the image will be converted to a grayscale
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// image as though seen through a colored glass, like "Colorize" in GIMP.
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static void apply_hue_saturation(video::IImage *dst, v2u32 dst_pos, v2u32 size,
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s32 hue, s32 saturation, s32 lightness, bool colorize);
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// Apply an overlay blend to an images.
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// Overlay blend combines Multiply and Screen blend modes.The parts of the top
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// layer where the base layer is light become lighter, the parts where the base
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// layer is dark become darker.Areas where the base layer are mid grey are
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// unaffected.An overlay with the same picture looks like an S - curve.
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static void apply_overlay(video::IImage *overlay, video::IImage *dst,
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v2s32 overlay_pos, v2s32 dst_pos, v2u32 size, bool hardlight);
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// Adjust the brightness and contrast of the base image. Conceptually like
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// "Brightness-Contrast" in GIMP but allowing brightness to be wound all the
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// way up to white or down to black.
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static void apply_brightness_contrast(video::IImage *dst, v2u32 dst_pos, v2u32 size,
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s32 brightness, s32 contrast);
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// Apply a mask to an image
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static void apply_mask(video::IImage *mask, video::IImage *dst,
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v2s32 mask_pos, v2s32 dst_pos, v2u32 size);
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@ -1106,43 +1132,53 @@ static std::string unescape_string(const std::string &str, const char esc = '\\'
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return out;
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}
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/*
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Replaces the smaller of the two images with one upscaled to match the
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dimensions of the other.
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Ensure no other references to these images are being held, as one may
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get dropped and switched with a new image.
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*/
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void upscaleImagesToMatchLargest(video::IImage *& img1,
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video::IImage *& img2)
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{
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core::dimension2d<u32> dim1 = img1->getDimension();
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core::dimension2d<u32> dim2 = img2->getDimension();
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if (dim1 == dim2) {
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// image dimensions match, no scaling required
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}
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else if (dim1.Width * dim1.Height < dim2.Width * dim2.Height) {
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// Upscale img1
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video::IImage *scaled_image = RenderingEngine::get_video_driver()->
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createImage(video::ECF_A8R8G8B8, dim2);
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img1->copyToScaling(scaled_image);
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img1->drop();
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img1 = scaled_image;
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} else {
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// Upscale img2
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video::IImage *scaled_image = RenderingEngine::get_video_driver()->
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createImage(video::ECF_A8R8G8B8, dim1);
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img2->copyToScaling(scaled_image);
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img2->drop();
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img2 = scaled_image;
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}
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}
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void blitBaseImage(video::IImage* &src, video::IImage* &dst)
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{
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//infostream<<"Blitting "<<part_of_name<<" on base"<<std::endl;
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upscaleImagesToMatchLargest(dst, src);
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// Size of the copied area
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core::dimension2d<u32> dim = src->getDimension();
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//core::dimension2d<u32> dim(16,16);
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core::dimension2d<u32> dim_dst = dst->getDimension();
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// Position to copy the blitted to in the base image
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core::position2d<s32> pos_to(0,0);
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// Position to copy the blitted from in the blitted image
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core::position2d<s32> pos_from(0,0);
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// Blit
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/*image->copyToWithAlpha(baseimg, pos_to,
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core::rect<s32>(pos_from, dim),
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video::SColor(255,255,255,255),
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NULL);*/
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core::dimension2d<u32> dim_dst = dst->getDimension();
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if (dim == dim_dst) {
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blit_with_alpha(src, dst, pos_from, pos_to, dim);
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} else if (dim.Width * dim.Height < dim_dst.Width * dim_dst.Height) {
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// Upscale overlying image
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video::IImage *scaled_image = RenderingEngine::get_video_driver()->
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createImage(video::ECF_A8R8G8B8, dim_dst);
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src->copyToScaling(scaled_image);
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blit_with_alpha(scaled_image, dst, pos_from, pos_to, dim_dst);
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scaled_image->drop();
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} else {
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// Upscale base image
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video::IImage *scaled_base = RenderingEngine::get_video_driver()->
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createImage(video::ECF_A8R8G8B8, dim);
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dst->copyToScaling(scaled_base);
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dst->drop();
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dst = scaled_base;
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blit_with_alpha(src, dst, pos_from, pos_to, dim);
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}
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blit_with_alpha(src, dst, pos_from, pos_to, dim_dst);
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}
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bool TextureSource::generateImagePart(std::string part_of_name,
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@ -1312,6 +1348,44 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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}
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}
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}
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/*
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[fill:WxH:color
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[fill:WxH:X,Y:color
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Creates a texture of the given size and color, optionally with an <x>,<y>
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position. An alpha value may be specified in the `Colorstring`.
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*/
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else if (str_starts_with(part_of_name, "[fill"))
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{
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s32 x = 0;
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s32 y = 0;
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Strfnd sf(part_of_name);
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sf.next(":");
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u32 width = stoi(sf.next("x"));
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u32 height = stoi(sf.next(":"));
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std::string color_or_x = sf.next(",");
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video::SColor color;
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if (!parseColorString(color_or_x, color, true)) {
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x = stoi(color_or_x);
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y = stoi(sf.next(":"));
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std::string color_str = sf.next(":");
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if (!parseColorString(color_str, color, false))
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return false;
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}
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core::dimension2d<u32> dim(width, height);
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video::IImage *img = driver->createImage(video::ECF_A8R8G8B8, dim);
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img->fill(color);
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if (baseimg == nullptr) {
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baseimg = img;
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} else {
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blit_with_alpha(img, baseimg, v2s32(0, 0), v2s32(x, y), dim);
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img->drop();
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}
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}
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/*
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[brighten
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*/
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@ -1584,10 +1658,16 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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}
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/*
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[multiply:color
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multiplys a given color to any pixel of an image
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or
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[screen:color
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Multiply and Screen blend modes are basic blend modes for darkening and lightening
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images, respectively.
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A Multiply blend multiplies a given color to every pixel of an image.
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A Screen blend has the opposite effect to a Multiply blend.
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color = color as ColorString
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*/
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else if (str_starts_with(part_of_name, "[multiply:")) {
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else if (str_starts_with(part_of_name, "[multiply:") ||
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str_starts_with(part_of_name, "[screen:")) {
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Strfnd sf(part_of_name);
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sf.next(":");
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std::string color_str = sf.next(":");
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@ -1603,13 +1683,18 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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if (!parseColorString(color_str, color, false))
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return false;
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apply_multiplication(baseimg, v2u32(0, 0), baseimg->getDimension(), color);
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if (str_starts_with(part_of_name, "[multiply:")) {
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apply_multiplication(baseimg, v2u32(0, 0),
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baseimg->getDimension(), color);
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} else {
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apply_screen(baseimg, v2u32(0, 0), baseimg->getDimension(), color);
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}
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}
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/*
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[colorize:color
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[colorize:color:ratio
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Overlays image with given color
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color = color as ColorString
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ratio = optional string "alpha", or a weighting between 0 and 255
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*/
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else if (str_starts_with(part_of_name, "[colorize:"))
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{
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@ -1876,6 +1961,115 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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}
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pngimg->drop();
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}
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/*
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[hsl:hue:saturation:lightness
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or
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[colorizehsl:hue:saturation:lightness
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Adjust the hue, saturation, and lightness of the base image. Like
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"Hue-Saturation" in GIMP, but with 0 as the mid-point.
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Hue should be from -180 to +180, though 0 to 360 is also supported.
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Saturation and lightness are optional, with lightness from -100 to
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+100, and sauration from -100 to +100-or-higher.
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If colorize is true then saturation is from 0 to 100, and the image
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will be converted to a grayscale image as though seen through a
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colored glass, like "Colorize" in GIMP.
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*/
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else if (str_starts_with(part_of_name, "[hsl:") ||
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str_starts_with(part_of_name, "[colorizehsl:")) {
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if (baseimg == nullptr) {
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errorstream << "generateImagePart(): baseimg == NULL "
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<< "for part_of_name=\"" << part_of_name
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<< "\", cancelling." << std::endl;
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return false;
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}
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bool colorize = str_starts_with(part_of_name, "[colorizehsl:");
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// saturation range is 0 to 100 when colorize is true
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s32 defaultSaturation = colorize ? 50 : 0;
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Strfnd sf(part_of_name);
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sf.next(":");
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s32 hue = mystoi(sf.next(":"), -180, 360);
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s32 saturation = sf.at_end() ? defaultSaturation : mystoi(sf.next(":"), -100, 1000);
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s32 lightness = sf.at_end() ? 0 : mystoi(sf.next(":"), -100, 100);
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apply_hue_saturation(baseimg, v2u32(0, 0), baseimg->getDimension(),
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hue, saturation, lightness, colorize);
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}
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/*
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[overlay:filename
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or
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[hardlight:filename
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"A.png^[hardlight:B.png" is the same as "B.png^[overlay:A.Png"
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Applies an Overlay or Hard Light blend between two images, like the
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layer modes of the same names in GIMP.
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Overlay combines Multiply and Screen blend modes. The parts of the
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top layer where the base layer is light become lighter, the parts
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where the base layer is dark become darker. Areas where the base
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layer are mid grey are unaffected. An overlay with the same picture
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looks like an S-curve.
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Swapping the top layer and base layer is a Hard Light blend
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*/
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else if (str_starts_with(part_of_name, "[overlay:") ||
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str_starts_with(part_of_name, "[hardlight:")) {
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if (baseimg == nullptr) {
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errorstream << "generateImage(): baseimg == NULL "
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<< "for part_of_name=\"" << part_of_name
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<< "\", cancelling." << std::endl;
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return false;
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}
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Strfnd sf(part_of_name);
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sf.next(":");
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std::string filename = unescape_string(sf.next_esc(":", escape), escape);
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video::IImage *img = generateImage(filename, source_image_names);
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if (img) {
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upscaleImagesToMatchLargest(baseimg, img);
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bool hardlight = str_starts_with(part_of_name, "[hardlight:");
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apply_overlay(img, baseimg, v2s32(0, 0), v2s32(0, 0),
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img->getDimension(), hardlight);
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img->drop();
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} else {
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errorstream << "generateImage(): Failed to load \""
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<< filename << "\".";
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}
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}
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/*
|
||||
[contrast:C:B
|
||||
|
||||
Adjust the brightness and contrast of the base image. Conceptually
|
||||
like GIMP's "Brightness-Contrast" feature but allows brightness to
|
||||
be wound all the way up to white or down to black.
|
||||
C and B are both values from -127 to +127.
|
||||
B is optional.
|
||||
*/
|
||||
else if (str_starts_with(part_of_name, "[contrast:")) {
|
||||
|
||||
if (baseimg == nullptr) {
|
||||
errorstream << "generateImagePart(): baseimg == NULL "
|
||||
<< "for part_of_name=\"" << part_of_name
|
||||
<< "\", cancelling." << std::endl;
|
||||
return false;
|
||||
}
|
||||
|
||||
Strfnd sf(part_of_name);
|
||||
sf.next(":");
|
||||
s32 contrast = mystoi(sf.next(":"), -127, 127);
|
||||
s32 brightness = sf.at_end() ? 0 : mystoi(sf.next(":"), -127, 127);
|
||||
|
||||
apply_brightness_contrast(baseimg, v2u32(0, 0),
|
||||
baseimg->getDimension(), brightness, contrast);
|
||||
}
|
||||
else
|
||||
{
|
||||
errorstream << "generateImagePart(): Invalid "
|
||||
@ -1984,7 +2178,7 @@ static void blit_with_interpolate_overlay(video::IImage *src, video::IImage *dst
|
||||
#endif
|
||||
|
||||
/*
|
||||
Apply color to destination
|
||||
Apply color to destination, using a weighted interpolation blend
|
||||
*/
|
||||
static void apply_colorize(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
const video::SColor &color, int ratio, bool keep_alpha)
|
||||
@ -2022,7 +2216,7 @@ static void apply_colorize(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
}
|
||||
|
||||
/*
|
||||
Apply color to destination
|
||||
Apply color to destination, using a Multiply blend mode
|
||||
*/
|
||||
static void apply_multiplication(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
const video::SColor &color)
|
||||
@ -2042,6 +2236,196 @@ static void apply_multiplication(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
Apply color to destination, using a Screen blend mode
|
||||
*/
|
||||
static void apply_screen(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
const video::SColor &color)
|
||||
{
|
||||
video::SColor dst_c;
|
||||
|
||||
for (u32 y = dst_pos.Y; y < dst_pos.Y + size.Y; y++)
|
||||
for (u32 x = dst_pos.X; x < dst_pos.X + size.X; x++) {
|
||||
dst_c = dst->getPixel(x, y);
|
||||
dst_c.set(
|
||||
dst_c.getAlpha(),
|
||||
255 - ((255 - dst_c.getRed()) * (255 - color.getRed())) / 255,
|
||||
255 - ((255 - dst_c.getGreen()) * (255 - color.getGreen())) / 255,
|
||||
255 - ((255 - dst_c.getBlue()) * (255 - color.getBlue())) / 255
|
||||
);
|
||||
dst->setPixel(x, y, dst_c);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
Adjust the hue, saturation, and lightness of destination. Like
|
||||
"Hue-Saturation" in GIMP, but with 0 as the mid-point.
|
||||
Hue should be from -180 to +180, or from 0 to 360.
|
||||
Saturation and Lightness are percentages.
|
||||
Lightness is from -100 to +100.
|
||||
Saturation goes down to -100 (fully desaturated) but can go above 100,
|
||||
allowing for even muted colors to become saturated.
|
||||
|
||||
If colorize is true then saturation is from 0 to 100, and destination will
|
||||
be converted to a grayscale image as seen through a colored glass, like
|
||||
"Colorize" in GIMP.
|
||||
*/
|
||||
static void apply_hue_saturation(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
s32 hue, s32 saturation, s32 lightness, bool colorize)
|
||||
{
|
||||
video::SColorf colorf;
|
||||
video::SColorHSL hsl;
|
||||
f32 norm_s = core::clamp(saturation, -100, 1000) / 100.0f;
|
||||
f32 norm_l = core::clamp(lightness, -100, 100) / 100.0f;
|
||||
|
||||
if (colorize) {
|
||||
hsl.Saturation = core::clamp((f32)saturation, 0.0f, 100.0f);
|
||||
}
|
||||
|
||||
for (u32 y = dst_pos.Y; y < dst_pos.Y + size.Y; y++)
|
||||
for (u32 x = dst_pos.X; x < dst_pos.X + size.X; x++) {
|
||||
|
||||
if (colorize) {
|
||||
f32 lum = dst->getPixel(x, y).getLuminance() / 255.0f;
|
||||
|
||||
if (norm_l < 0) {
|
||||
lum *= norm_l + 1.0f;
|
||||
} else {
|
||||
lum = lum * (1.0f - norm_l) + norm_l;
|
||||
}
|
||||
hsl.Hue = 0;
|
||||
hsl.Luminance = lum * 100;
|
||||
|
||||
} else {
|
||||
// convert the RGB to HSL
|
||||
colorf = video::SColorf(dst->getPixel(x, y));
|
||||
hsl.fromRGB(colorf);
|
||||
|
||||
if (norm_l < 0) {
|
||||
hsl.Luminance *= norm_l + 1.0f;
|
||||
} else{
|
||||
hsl.Luminance = hsl.Luminance + norm_l * (100.0f - hsl.Luminance);
|
||||
}
|
||||
|
||||
// Adjusting saturation in the same manner as lightness resulted in
|
||||
// muted colours being affected too much and bright colours not
|
||||
// affected enough, so I'm borrowing a leaf out of gimp's book and
|
||||
// using a different scaling approach for saturation.
|
||||
// https://github.com/GNOME/gimp/blob/6cc1e035f1822bf5198e7e99a53f7fa6e281396a/app/operations/gimpoperationhuesaturation.c#L139-L145=
|
||||
// This difference is why values over 100% are not necessary for
|
||||
// lightness but are very useful with saturation. An alternative UI
|
||||
// approach would be to have an upper saturation limit of 100, but
|
||||
// multiply positive values by ~3 to make it a more useful positive
|
||||
// range scale.
|
||||
hsl.Saturation *= norm_s + 1.0f;
|
||||
hsl.Saturation = core::clamp(hsl.Saturation, 0.0f, 100.0f);
|
||||
}
|
||||
|
||||
// Apply the specified HSL adjustments
|
||||
hsl.Hue = fmod(hsl.Hue + hue, 360);
|
||||
if (hsl.Hue < 0)
|
||||
hsl.Hue += 360;
|
||||
|
||||
// Convert back to RGB
|
||||
hsl.toRGB(colorf);
|
||||
dst->setPixel(x, y, colorf.toSColor());
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
Apply an Overlay blend to destination
|
||||
If hardlight is true then swap the dst & blend images (a hardlight blend)
|
||||
*/
|
||||
static void apply_overlay(video::IImage *blend, video::IImage *dst,
|
||||
v2s32 blend_pos, v2s32 dst_pos, v2u32 size, bool hardlight)
|
||||
{
|
||||
video::IImage *blend_layer = hardlight ? dst : blend;
|
||||
video::IImage *base_layer = hardlight ? blend : dst;
|
||||
v2s32 blend_layer_pos = hardlight ? dst_pos : blend_pos;
|
||||
v2s32 base_layer_pos = hardlight ? blend_pos : dst_pos;
|
||||
|
||||
for (u32 y = 0; y < size.Y; y++)
|
||||
for (u32 x = 0; x < size.X; x++) {
|
||||
s32 base_x = x + base_layer_pos.X;
|
||||
s32 base_y = y + base_layer_pos.Y;
|
||||
|
||||
video::SColor blend_c =
|
||||
blend_layer->getPixel(x + blend_layer_pos.X, y + blend_layer_pos.Y);
|
||||
video::SColor base_c = base_layer->getPixel(base_x, base_y);
|
||||
double blend_r = blend_c.getRed() / 255.0;
|
||||
double blend_g = blend_c.getGreen() / 255.0;
|
||||
double blend_b = blend_c.getBlue() / 255.0;
|
||||
double base_r = base_c.getRed() / 255.0;
|
||||
double base_g = base_c.getGreen() / 255.0;
|
||||
double base_b = base_c.getBlue() / 255.0;
|
||||
|
||||
base_c.set(
|
||||
base_c.getAlpha(),
|
||||
// Do a Multiply blend if less that 0.5, otherwise do a Screen blend
|
||||
(u32)((base_r < 0.5 ? 2 * base_r * blend_r : 1 - 2 * (1 - base_r) * (1 - blend_r)) * 255),
|
||||
(u32)((base_g < 0.5 ? 2 * base_g * blend_g : 1 - 2 * (1 - base_g) * (1 - blend_g)) * 255),
|
||||
(u32)((base_b < 0.5 ? 2 * base_b * blend_b : 1 - 2 * (1 - base_b) * (1 - blend_b)) * 255)
|
||||
);
|
||||
dst->setPixel(base_x, base_y, base_c);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
Adjust the brightness and contrast of the base image.
|
||||
|
||||
Conceptually like GIMP's "Brightness-Contrast" feature but allows brightness to be
|
||||
wound all the way up to white or down to black.
|
||||
*/
|
||||
static void apply_brightness_contrast(video::IImage *dst, v2u32 dst_pos, v2u32 size,
|
||||
s32 brightness, s32 contrast)
|
||||
{
|
||||
video::SColor dst_c;
|
||||
// Only allow normalized contrast to get as high as 127/128 to avoid infinite slope.
|
||||
// (we could technically allow -128/128 here as that would just result in 0 slope)
|
||||
double norm_c = core::clamp(contrast, -127, 127) / 128.0;
|
||||
double norm_b = core::clamp(brightness, -127, 127) / 127.0;
|
||||
|
||||
// Scale brightness so its range is -127.5 to 127.5, otherwise brightness
|
||||
// adjustments will outputs values from 0.5 to 254.5 instead of 0 to 255.
|
||||
double scaled_b = brightness * 127.5 / 127;
|
||||
|
||||
// Calculate a contrast slope such that that no colors will get clamped due
|
||||
// to the brightness setting.
|
||||
// This allows the texture modifier to used as a brightness modifier without
|
||||
// the user having to calculate a contrast to avoid clipping at that brightness.
|
||||
double slope = 1 - fabs(norm_b);
|
||||
|
||||
// Apply the user's contrast adjustment to the calculated slope, such that
|
||||
// -127 will make it near-vertical and +127 will make it horizontal
|
||||
double angle = atan(slope);
|
||||
angle += norm_c <= 0
|
||||
? norm_c * angle // allow contrast slope to be lowered to 0
|
||||
: norm_c * (M_PI_2 - angle); // allow contrast slope to be raised almost vert.
|
||||
slope = tan(angle);
|
||||
|
||||
double c = slope <= 1
|
||||
? -slope * 127.5 + 127.5 + scaled_b // shift up/down when slope is horiz.
|
||||
: -slope * (127.5 - scaled_b) + 127.5; // shift left/right when slope is vert.
|
||||
|
||||
// add 0.5 to c so that when the final result is cast to int, it is effectively
|
||||
// rounded rather than trunc'd.
|
||||
c += 0.5;
|
||||
|
||||
for (u32 y = dst_pos.Y; y < dst_pos.Y + size.Y; y++)
|
||||
for (u32 x = dst_pos.X; x < dst_pos.X + size.X; x++) {
|
||||
dst_c = dst->getPixel(x, y);
|
||||
|
||||
dst_c.set(
|
||||
dst_c.getAlpha(),
|
||||
core::clamp((int)(slope * dst_c.getRed() + c), 0, 255),
|
||||
core::clamp((int)(slope * dst_c.getGreen() + c), 0, 255),
|
||||
core::clamp((int)(slope * dst_c.getBlue() + c), 0, 255)
|
||||
);
|
||||
dst->setPixel(x, y, dst_c);
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
Apply mask to destination
|
||||
*/
|
||||
|
||||
Loading…
Reference in New Issue
Block a user