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

#include "sdl/rect.hpp"
#include "sdl/utils.hpp"
#include "color.hpp"
#include "log.hpp"
#include "xBRZ/xbrz.hpp"
#include <algorithm>
#include <cassert>
#include <cstring>
#include "utils/span.hpp"
#include <SDL2/SDL_version.h>
#include <boost/circular_buffer.hpp>
#include <boost/math/constants/constants.hpp>

Include dependency graph for utils.cpp:

Macros
#define	ERR_DP LOG_STREAM(err, log_display)

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

void	adjust_surface_color (surface &nsurf, int red, int green, int blue)

void	greyscale_image (surface &nsurf)

void	monochrome_image (surface &nsurf, const int threshold)

void	sepia_image (surface &nsurf)

void	negative_image (surface &nsurf, const int thresholdR, const int thresholdG, const int thresholdB)

void	alpha_to_greyscale (surface &nsurf)

void	wipe_alpha (surface &nsurf)

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

void	swap_channels_image (surface &nsurf, channel r, channel g, channel b, channel a)

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

void	brighten_image (surface &nsurf, int32_t amount)

void	adjust_surface_alpha (surface &surf, uint8_t alpha_mod)

void	adjust_surface_alpha_add (surface &nsurf, int amount)

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

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

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

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

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

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

void	blend_surface (surface &nsurf, 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...

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...

void	flip_surface (surface &nsurf)

void	flop_surface (surface &nsurf)

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

rect	get_non_transparent_portion (const surface &nsurf)

Variables
static lg::log_domain	log_display ("display")

Detailed Description

Support-routines for the SDL-graphics-library.

Definition in file utils.cpp.

Macro Definition Documentation

◆ ERR_DP

#define ERR_DP LOG_STREAM(err, log_display)

Definition at line 38 of file utils.cpp.

Function Documentation

◆ adjust_surface_alpha()

void adjust_surface_alpha	(	surface &	surf,
		uint8_t	alpha_mod
	)

Definition at line 683 of file utils.cpp.

References surf.

◆ adjust_surface_alpha_add()

void adjust_surface_alpha_add	(	surface &	nsurf,
		int	amount
	)

Definition at line 692 of file utils.cpp.

References b, color_t::from_argb_bytes(), g, and surface_locker< T >::pixel_span().

◆ adjust_surface_color()

void adjust_surface_color	(	surface &	nsurf,
		int	red,
		int	green,
		int	blue
	)

Definition at line 405 of file utils.cpp.

References b, blue, color_t::from_argb_bytes(), g, green, surface_locker< T >::pixel_span(), and red.

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

◆ alpha_to_greyscale()

void alpha_to_greyscale ( surface & nsurf )

Definition at line 502 of file utils.cpp.

References surface_locker< T >::pixel_span().

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

◆ blend_surface()

void blend_surface	(	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.

Definition at line 1159 of file utils.cpp.

References b, blue, color_t::from_argb_bytes(), g, green, surface_locker< T >::pixel_span(), and red.

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

◆ blur_alpha_surface()

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

Cross-fades a surface with alpha channel.

Parameters

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

Definition at line 962 of file utils.cpp.

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

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

◆ blur_surface()

void blur_surface	(	surface &	surf,
		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 846 of file utils.cpp.

References blue, green, p, surface_locker< T >::pixels(), red, and surf.

Referenced by gui2::canvas::update_blur().

◆ brighten_image()

void brighten_image	(	surface &	nsurf,
		int32_t	amount
	)

Definition at line 665 of file utils.cpp.

References b, fixed_point_multiply(), color_t::from_argb_bytes(), g, and surface_locker< T >::pixel_span().

◆ cut_surface()

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

Cuts a rectangle from a surface.

Definition at line 1100 of file utils.cpp.

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

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

◆ flip_surface()

void flip_surface ( surface & nsurf )

Definition at line 1323 of file utils.cpp.

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

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

◆ flop_surface()

void flop_surface ( surface & nsurf )

Definition at line 1339 of file utils.cpp.

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

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

◆ get_non_transparent_portion()

rect get_non_transparent_portion ( const surface & nsurf )

Definition at line 1399 of file utils.cpp.

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

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

◆ get_surface_portion()

surface get_surface_portion	(	const surface &	surf,
		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 1355 of file utils.cpp.

References dst, PLAIN_LOG, and src.

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

◆ greyscale_image()

void greyscale_image ( surface & nsurf )

Definition at line 422 of file utils.cpp.

References b, color_t::from_argb_bytes(), g, and surface_locker< T >::pixel_span().

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

◆ in_mask_surface()

bool in_mask_surface	(	const surface &	nsurf,
		const surface &	nmask
	)

Check if a surface fit into a mask.

Definition at line 760 of file utils.cpp.

References surface_locker< T >::pixels().

Referenced by image::is_in_hex().

◆ light_surface()

void light_surface	(	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 798 of file utils.cpp.

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

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

◆ mask_surface()

void mask_surface	(	surface &	nsurf,
		const surface &	nmask,
		bool *	empty_result,
		const std::string &	filename
	)

Applies a mask on a surface.

Definition at line 706 of file utils.cpp.

References surface::area(), b, filename, color_t::from_argb_bytes(), 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()

void monochrome_image	(	surface &	nsurf,
		const int	threshold
	)

Definition at line 444 of file utils.cpp.

References b, color_t::from_argb_bytes(), g, and surface_locker< T >::pixel_span().

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

◆ negative_image()

void negative_image	(	surface &	nsurf,
		const int	thresholdR,
		const int	thresholdG,
		const int	thresholdB
	)

Definition at line 481 of file utils.cpp.

References b, color_t::from_argb_bytes(), g, and surface_locker< T >::pixel_span().

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

◆ recolor_image()

void 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.

Definition at line 634 of file utils.cpp.

References ALPHA_OPAQUE, color_t::from_argb_bytes(), and surface_locker< T >::pixel_span().

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 1249 of file utils.cpp.

References surface::clone(), is_odd(), surface_locker< T >::pixels(), PLAIN_LOG, surf, 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 1289 of file utils.cpp.

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

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.