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Fix dividing by zero crashes in texture modifiers
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2c390b5473
commit
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@ -1598,6 +1598,13 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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u32 frame_count = stoi(sf.next(":"));
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u32 frame_index = stoi(sf.next(":"));
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if (frame_count == 0){
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errorstream << "generateImagePart(): invalid frame_count "
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<< "for part_of_name=\"" << part_of_name
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<< "\", using frame_count = 1 instead." << std::endl;
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frame_count = 1;
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}
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if (baseimg == NULL){
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errorstream<<"generateImagePart(): baseimg != NULL "
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<<"for part_of_name=\""<<part_of_name
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@ -1659,7 +1666,7 @@ 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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or
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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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@ -1685,7 +1692,7 @@ 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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if (str_starts_with(part_of_name, "[multiply:")) {
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apply_multiplication(baseimg, v2u32(0, 0),
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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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@ -1899,6 +1906,13 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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u32 x0 = stoi(sf.next(","));
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u32 y0 = stoi(sf.next(":"));
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if (w0 == 0 || h0 == 0) {
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errorstream << "generateImagePart(): invalid width or height "
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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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core::dimension2d<u32> img_dim = baseimg->getDimension();
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core::dimension2d<u32> tile_dim(v2u32(img_dim) / v2u32(w0, h0));
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@ -1965,7 +1979,7 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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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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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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@ -1978,7 +1992,7 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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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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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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@ -1995,7 +2009,7 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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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 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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@ -2005,7 +2019,7 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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}
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/*
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[overlay:filename
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or
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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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@ -2069,7 +2083,7 @@ bool TextureSource::generateImagePart(std::string part_of_name,
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s32 contrast = mystoi(sf.next(":"), -127, 127);
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s32 brightness = sf.at_end() ? 0 : mystoi(sf.next(":"), -127, 127);
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apply_brightness_contrast(baseimg, v2u32(0, 0),
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apply_brightness_contrast(baseimg, v2u32(0, 0),
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baseimg->getDimension(), brightness, contrast);
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}
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else
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@ -2347,14 +2361,14 @@ static void apply_overlay(video::IImage *blend, video::IImage *dst,
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v2s32 blend_layer_pos = hardlight ? dst_pos : blend_pos;
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v2s32 base_layer_pos = hardlight ? blend_pos : dst_pos;
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for (u32 y = 0; y < size.Y; y++)
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for (u32 y = 0; y < size.Y; y++)
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for (u32 x = 0; x < size.X; x++) {
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s32 base_x = x + base_layer_pos.X;
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s32 base_y = y + base_layer_pos.Y;
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video::SColor blend_c =
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blend_layer->getPixel(x + blend_layer_pos.X, y + blend_layer_pos.Y);
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video::SColor base_c = base_layer->getPixel(base_x, base_y);
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video::SColor base_c = base_layer->getPixel(base_x, base_y);
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double blend_r = blend_c.getRed() / 255.0;
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double blend_g = blend_c.getGreen() / 255.0;
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double blend_b = blend_c.getBlue() / 255.0;
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@ -2373,7 +2387,7 @@ static void apply_overlay(video::IImage *blend, video::IImage *dst,
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}
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}
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/*
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/*
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Adjust the brightness and contrast of the base image.
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Conceptually like GIMP's "Brightness-Contrast" feature but allows brightness to be
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@ -2387,17 +2401,17 @@ static void apply_brightness_contrast(video::IImage *dst, v2u32 dst_pos, v2u32 s
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// (we could technically allow -128/128 here as that would just result in 0 slope)
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double norm_c = core::clamp(contrast, -127, 127) / 128.0;
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double norm_b = core::clamp(brightness, -127, 127) / 127.0;
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// Scale brightness so its range is -127.5 to 127.5, otherwise brightness
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// adjustments will outputs values from 0.5 to 254.5 instead of 0 to 255.
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double scaled_b = brightness * 127.5 / 127;
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// Calculate a contrast slope such that that no colors will get clamped due
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// Calculate a contrast slope such that that no colors will get clamped due
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// to the brightness setting.
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// This allows the texture modifier to used as a brightness modifier without
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// the user having to calculate a contrast to avoid clipping at that brightness.
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double slope = 1 - fabs(norm_b);
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// Apply the user's contrast adjustment to the calculated slope, such that
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// -127 will make it near-vertical and +127 will make it horizontal
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double angle = atan(slope);
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