Support-routines for the SDL-graphics-library. More...

#include "sdl/utils.hpp"
#include "sdl/rect.hpp"
#include "color.hpp"
#include "log.hpp"
#include "xBRZ/xbrz.hpp"
#include <algorithm>
#include <cassert>
#include <cstring>
#include <boost/circular_buffer.hpp>
#include <boost/math/constants/constants.hpp>

Include dependency graph for utils.cpp:

Functions
surface	scale_surface_xbrz (const surface &surf, std::size_t z)
	Scale a surface using xBRZ algorithm. More...

surface	scale_surface_nn (const surface &surf, int w, int h)
	Scale a surface using the nearest neighbor algorithm (provided by xBRZ lib) More...

surface	scale_surface (const surface &surf, int w, int h)
	Scale a surface using alpha-weighted modified bilinear filtering Note: causes artifacts with alpha gradients, for example in some portraits. More...

surface	scale_surface_legacy (const surface &surf, int w, int h)
	Scale a surface using simple bilinear filtering (discarding rgb from source pixels with 0 alpha) More...

surface	scale_surface_sharp (const surface &surf, int w, int h)
	Scale a surface using modified nearest neighbour algorithm. More...

surface	adjust_surface_color (const surface &surf, int red, int green, int blue)

surface	greyscale_image (const surface &surf)

surface	monochrome_image (const surface &surf, const int threshold)

surface	sepia_image (const surface &surf)

surface	negative_image (const surface &surf, const int thresholdR, const int thresholdG, const int thresholdB)

surface	alpha_to_greyscale (const surface &surf)

surface	wipe_alpha (const surface &surf)

surface	shadow_image (const surface &surf, int scale)
	create an heavy shadow of the image, by blurring, increasing alpha and darkening More...

surface	swap_channels_image (const surface &surf, channel r, channel g, channel b, channel a)

surface	recolor_image (surface surf, const color_range_map &map_rgb)
	Recolors a surface using a map with source and converted palette values. More...

surface	brighten_image (const surface &surf, int32_t amount)

void	adjust_surface_alpha (surface &surf, uint8_t alpha_mod)

surface	adjust_surface_alpha_add (const surface &surf, int amount)

surface	mask_surface (const surface &surf, const surface &mask, bool *empty_result, const std::string &filename)
	Applies a mask on a surface. More...

bool	in_mask_surface (const surface &surf, const surface &mask)
	Check if a surface fit into a mask. More...

surface	light_surface (const surface &surf, const surface &lightmap)
	Light surf using lightmap. More...

surface	blur_surface (const surface &surf, int depth)
	Cross-fades a surface. More...

void	blur_surface (surface &surf, SDL_Rect rect, int depth)
	Cross-fades a surface in place. More...

surface	blur_alpha_surface (const surface &surf, int depth)
	Cross-fades a surface with alpha channel. More...

surface	cut_surface (const surface &surf, const SDL_Rect &r)
	Cuts a rectangle from a surface. More...

surface	blend_surface (const surface &surf, const double amount, const color_t color)
	Blends a surface with a color. More...

surface	rotate_any_surface (const surface &surf, float angle, int zoom, int offset)
	Rotates a surface by any degrees. More...

void	put_pixel (const surface &surf, surface_lock &surf_lock, int x, int y, uint32_t pixel)
	Helper methods for setting/getting a single pixel in an image. More...

uint32_t	get_pixel (const surface &surf, const const_surface_lock &surf_lock, int x, int y)

surface	rotate_180_surface (const surface &surf)
	Rotates a surface 180 degrees. More...

surface	rotate_90_surface (const surface &surf, bool clockwise)
	Rotates a surface 90 degrees. More...

surface	flip_surface (const surface &surf)

surface	flop_surface (const surface &surf)

surface	get_surface_portion (const surface &src, SDL_Rect &area)
	Get a portion of the screen. More...

SDL_Rect	get_non_transparent_portion (const surface &surf)

Detailed Description

Support-routines for the SDL-graphics-library.

Definition in file utils.cpp.

Function Documentation

◆ adjust_surface_alpha()

void adjust_surface_alpha	(	surface &	surf,
		uint8_t	alpha_mod
	)

Definition at line 975 of file utils.cpp.

◆ adjust_surface_alpha_add()

surface adjust_surface_alpha_add	(	const surface &	surf,
		int	amount
	)

Definition at line 984 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

◆ adjust_surface_color()

surface adjust_surface_color	(	const surface &	surf,
		int	red,
		int	green,
		int	blue
	)

Definition at line 484 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::apply_light(), image::get_tod_colored(), image::getMinimap(), image::cs_modification::operator()(), and sdl_blit().

◆ alpha_to_greyscale()

surface alpha_to_greyscale ( const surface & surf )

Definition at line 699 of file utils.cpp.

References surface::clone(), surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::plot_alpha_modification::operator()(), and sdl_blit().

◆ blend_surface()

surface blend_surface	(	const surface &	surf,
		const double	amount,
		const color_t	color
	)

Blends a surface with a color.

Every pixel in the surface will be blended with the color given. The final color of a pixel is amount * color + (1 - amount) * original.

Parameters

surf	The surface to blend.
amount	The amount of the new color is determined by `color`. Must be a number in the range [0, 1].
color	The color to blend width, note its alpha channel is ignored.

Returns: The blended surface.

Definition at line 1544 of file utils.cpp.

References a, b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::blend_modification::operator()().

◆ blur_alpha_surface()

surface blur_alpha_surface	(	const surface &	surf,
		int	depth = `1`
	)

Cross-fades a surface with alpha channel.

Parameters

surf	The source surface.
depth	The depth of the blurring.

Returns: A new, blurred, neutral surface.

Definition at line 1339 of file utils.cpp.

References surface::clone(), p, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::bl_modification::operator()(), and shadow_image().

◆ blur_surface() [1/2]

surface blur_surface	(	const surface &	surf,
		int	depth = `1`
	)

Cross-fades a surface.

Parameters

surf	The source surface.
depth	The depth of the blurring.

Returns: A new, blurred, neutral surface.

Definition at line 1204 of file utils.cpp.

References blur_surface(), surface::clone(), and PLAIN_LOG.

Referenced by blur_surface(), and gui2::canvas::draw().

◆ blur_surface() [2/2]

void blur_surface	(	surface &	surf,
		SDL_Rect	rect,
		int	depth = `1`
	)

Cross-fades a surface in place.

Parameters

surf	The surface to blur, must have 32 bits per pixel.
rect	The part of the surface to blur.
depth	The depth of the blurring.

Definition at line 1223 of file utils.cpp.

References p, and surface_locker< T >::pixels().

◆ brighten_image()

surface brighten_image	(	const surface &	surf,
		int32_t	amount
	)

Definition at line 933 of file utils.cpp.

References b, surface::clone(), fixed_point_multiply(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

◆ cut_surface()

surface cut_surface	(	const surface &	surf,
		const SDL_Rect &	r
	)

Cuts a rectangle from a surface.

Definition at line 1486 of file utils.cpp.

References surface_locker< T >::pixels(), PLAIN_LOG, and utf8::size().

Referenced by image::get_hexed(), image::load_image_sub_file(), and image::crop_modification::operator()().

◆ flip_surface()

surface flip_surface ( const surface & surf )

Definition at line 1779 of file utils.cpp.

References surface::clone(), surface_locker< T >::pixels(), PLAIN_LOG, and swap().

Referenced by image::fl_modification::operator()().

◆ flop_surface()

surface flop_surface ( const surface & surf )

Definition at line 1808 of file utils.cpp.

References surface::clone(), surface_locker< T >::pixels(), PLAIN_LOG, and swap().

Referenced by image::fl_modification::operator()().

◆ get_non_transparent_portion()

SDL_Rect get_non_transparent_portion ( const surface & surf )

Definition at line 1888 of file utils.cpp.

References surface::clone(), n, surface_locker< T >::pixels(), and PLAIN_LOG.

◆ get_pixel()

uint32_t get_pixel	(	const surface &	surf,
		const const_surface_lock &	surf_lock,
		int	x,
		int	y
	)

Definition at line 1679 of file utils.cpp.

References surface_locker< T >::pixels().

Referenced by rotate_any_surface().

◆ get_surface_portion()

surface get_surface_portion	(	const surface &	surf,
		SDL_Rect &	rect
	)

Get a portion of the screen.

Send nullptr if the portion is outside of the screen.

Parameters

surf	The source surface.
rect	The portion of the source surface to copy.

Returns: A surface containing the portion of the source. No RLE or Alpha bits are set.

Return values

0	if error or the portion is outside of the surface.

Definition at line 1837 of file utils.cpp.

References PLAIN_LOG.

◆ greyscale_image()

surface greyscale_image ( const surface & surf )

Definition at line 529 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::gs_modification::operator()(), and sdl_blit().

◆ in_mask_surface()

bool in_mask_surface	(	const surface &	surf,
		const surface &	mask
	)

Check if a surface fit into a mask.

Definition at line 1092 of file utils.cpp.

References surface::clone(), surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::is_in_hex().

◆ light_surface()

surface light_surface	(	const surface &	surf,
		const surface &	lightmap
	)

Light surf using lightmap.

Parameters

surf	The source surface.
lightmap	add/subtract this color to surf but RGB values are converted to (X-128)*2 to cover the full (-256,256) spectrum. Should already be neutral

Definition at line 1138 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::apply_light(), and image::light_modification::operator()().

◆ mask_surface()

surface mask_surface	(	const surface &	surf,
		const surface &	mask,
		bool *	empty_result = `nullptr`,
		const std::string &	filename = `std::string()`
	)

Applies a mask on a surface.

Definition at line 1022 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::get_hexed(), image::is_empty_hex(), image::load_image_sub_file(), and image::mask_modification::operator()().

◆ monochrome_image()

surface monochrome_image	(	const surface &	surf,
		const int	threshold
	)

Definition at line 574 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::bw_modification::operator()(), and sdl_blit().

◆ negative_image()

surface negative_image	(	const surface &	surf,
		const int	thresholdR,
		const int	thresholdG,
		const int	thresholdB
	)

Definition at line 656 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::negative_modification::operator()(), and sdl_blit().

◆ put_pixel()

void put_pixel	(	const surface &	surf,
		surface_lock &	surf_lock,
		int	x,
		int	y,
		uint32_t	pixel
	)

Helper methods for setting/getting a single pixel in an image.

Lifted from http://sdl.beuc.net/sdl.wiki/Pixel_Access

Parameters

surf	The image to get or receive the pixel from.
surf_lock	The locked surface to make sure the pointers are valid.
x	The position in the row of the pixel.
y	The row of the pixel.
pixel	The pixel value.

Definition at line 1648 of file utils.cpp.

References surface_locker< T >::pixels().

Referenced by rotate_any_surface().

◆ recolor_image()

surface recolor_image	(	surface	surf,
		const color_range_map &	map_rgb
	)

Recolors a surface using a map with source and converted palette values.

This is most often used for team-coloring.

Parameters

surf	The source surface.
map_rgb	Map of color values, with the keys corresponding to the source palette, and the values to the recolored palette.

Returns: A recolored surface, or a null surface if there are problems with the source.

Definition at line 894 of file utils.cpp.

References surface::clone(), color_t::from_argb_bytes(), i, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::rc_modification::operator()().

◆ rotate_180_surface()

surface rotate_180_surface ( const surface & surf )

Rotates a surface 180 degrees.

Parameters

surf	The surface to rotate.

Returns: The rotated surface.

Definition at line 1702 of file utils.cpp.

References surface::clone(), is_odd(), surface_locker< T >::pixels(), PLAIN_LOG, and swap().

Referenced by image::fl_modification::operator()(), and image::rotate_modification::operator()().

◆ rotate_90_surface()

surface rotate_90_surface	(	const surface &	surf,
		bool	clockwise
	)

Rotates a surface 90 degrees.

Parameters

surf	The surface to rotate.
clockwise	Whether the rotation should be clockwise (true) or counter-clockwise (false).

Returns: The rotated surface.

Definition at line 1744 of file utils.cpp.

References surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::rotate_modification::operator()().

◆ rotate_any_surface()

surface rotate_any_surface	(	const surface &	surf,
		float	angle,
		int	zoom,
		int	offset
	)

Rotates a surface by any degrees.

Precondition: zoom >= offset Otherwise

Returns: will have empty pixels.

Precondition: offset > 0 Otherwise the procedure will not return.

Parameters

surf	The surface to rotate.
angle	The angle of rotation.
zoom	Which zoom level to use for calculating the result.
offset	Pixel offset when scanning the zoomed source.

Returns: The rotated surface.

Definition at line 1591 of file utils.cpp.

References get_pixel(), put_pixel(), xbrz::scale(), and scale_surface().

Referenced by image::rotate_modification::operator()().

◆ scale_surface()

surface scale_surface	(	const surface &	surf,
		int	w,
		int	h
	)

Scale a surface using alpha-weighted modified bilinear filtering Note: causes artifacts with alpha gradients, for example in some portraits.

Parameters

surf	The source surface.
w	The width of the resulting surface.
h	The height of the resulting surface.

Returns: A surface containing the scaled version of the source.

Return values

0	Returned upon error.
surf	Returned if w == surf->w and h == surf->h.

Definition at line 129 of file utils.cpp.

References a, b, e, fixed_point_divide(), fixed_point_to_int(), g, h, n, surface_locker< T >::pixels(), PLAIN_LOG, s, and w.

Referenced by image::light_modification::operator()(), video::read_pixels_low_res(), rotate_any_surface(), and sdl_blit().

◆ scale_surface_legacy()

surface scale_surface_legacy	(	const surface &	surf,
		int	w,
		int	h
	)

Scale a surface using simple bilinear filtering (discarding rgb from source pixels with 0 alpha)

Parameters

surf	The source surface.
w	The width of the resulting surface.
h	The height of the resulting surface.

Returns: A surface containing the scaled version of the source.

Return values

0	Returned upon error.
surf	Returned if w == surf->w and h == surf->h.

Definition at line 258 of file utils.cpp.

References a, b, fixed_point_divide(), fixed_point_to_int(), g, h, surface_locker< T >::pixels(), PLAIN_LOG, and w.

Referenced by image::scale_modification::operator()(), and sdl_blit().

◆ scale_surface_nn()

surface scale_surface_nn	(	const surface &	surf,
		int	w,
		int	h
	)

Scale a surface using the nearest neighbor algorithm (provided by xBRZ lib)

Parameters

surf	The sources surface
w	The width of the resulting surface.
h	The height of the resulting surface.

Returns: The rescaled surface.

Definition at line 92 of file utils.cpp.

References h, xbrz::nearestNeighborScale(), surface_locker< T >::pixels(), PLAIN_LOG, and w.

Referenced by sdl_blit().

◆ scale_surface_sharp()

surface scale_surface_sharp	(	const surface &	surf,
		int	w,
		int	h
	)

Scale a surface using modified nearest neighbour algorithm.

Use only if preserving sharp edges is a priority (e.g. minimap).

Parameters

surf	The source surface.
w	The width of the resulting surface.
h	The height of the resulting surface.

Returns: A surface containing the scaled version of the source.

Return values

0	Returned upon error.
surf	Returned if w == surf->w and h == surf->h.

Definition at line 395 of file utils.cpp.

References a, b, g, h, surface_locker< T >::pixels(), PLAIN_LOG, and w.

Referenced by image::getMinimap(), image::scale_modification::operator()(), and sdl_blit().

◆ scale_surface_xbrz()

surface scale_surface_xbrz	(	const surface &	surf,
		std::size_t	z
	)

Scale a surface using xBRZ algorithm.

Parameters

surf	The source surface
z	The scaling factor. Should be an integer 2-5 (1 is tolerated).

Returns: The scaled surface

Definition at line 55 of file utils.cpp.

References surface_locker< T >::pixels(), PLAIN_LOG, and xbrz::scale().

Referenced by image::xbrz_modification::operator()(), and sdl_blit().

◆ sepia_image()

surface sepia_image ( const surface & surf )

Definition at line 614 of file utils.cpp.

References b, surface::clone(), g, surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::sepia_modification::operator()(), and sdl_blit().

◆ shadow_image()

surface shadow_image	(	const surface &	surf,
		int	scale
	)

create an heavy shadow of the image, by blurring, increasing alpha and darkening

Definition at line 755 of file utils.cpp.

References blur_alpha_surface(), surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by sdl_blit().

◆ swap_channels_image()

surface swap_channels_image	(	const surface &	surf,
		channel	r,
		channel	g,
		channel	b,
		channel	a
	)

Definition at line 792 of file utils.cpp.

References ALPHA, BLUE, surface::clone(), GREEN, surface_locker< T >::pixels(), PLAIN_LOG, and RED.

Referenced by image::swap_modification::operator()().

◆ wipe_alpha()

surface wipe_alpha ( const surface & surf )

Definition at line 727 of file utils.cpp.

References surface::clone(), surface_locker< T >::pixels(), and PLAIN_LOG.

Referenced by image::wipe_alpha_modification::operator()(), and sdl_blit().

Functions

Detailed Description

Function Documentation

◆ adjust_surface_alpha()

◆ adjust_surface_alpha_add()

◆ adjust_surface_color()

◆ alpha_to_greyscale()

◆ blend_surface()

◆ blur_alpha_surface()

◆ blur_surface() [1/2]

◆ blur_surface() [2/2]

◆ brighten_image()

◆ cut_surface()

◆ flip_surface()

◆ flop_surface()

◆ get_non_transparent_portion()

◆ get_pixel()

◆ get_surface_portion()

◆ greyscale_image()

◆ in_mask_surface()

◆ light_surface()

◆ mask_surface()

◆ monochrome_image()

◆ negative_image()

◆ put_pixel()

◆ recolor_image()

◆ rotate_180_surface()

◆ rotate_90_surface()

◆ rotate_any_surface()

◆ scale_surface()

◆ scale_surface_legacy()

◆ scale_surface_nn()

◆ scale_surface_sharp()

◆ scale_surface_xbrz()

◆ sepia_image()

◆ shadow_image()

◆ swap_channels_image()

◆ wipe_alpha()