#include <config.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <png.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include "client-types.h"
#include "client.h"
#include "x11.h"

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Data Structures
struct	Pngx_Color_Values
Defines
#define	BPP 4
#define	BRIGHTNESS_FACTOR 1
#define	COLOR_FACTOR 3
#define	MAX_IMAGE_HEIGHT 1024
#define	MAX_IMAGE_WIDTH 1024
#define	PNGX_DATA 3
#define	PNGX_NOFILE 1
#define	PNGX_OUTOFMEM 2
#define	RATIO 100
Functions
int	create_and_rescale_image_from_data (Cache_Entry ce, int pixmap_num, uint8 rgba_data, int width, int height)
	Takes the pixmap to put the data into, as well as the rgba data (ie, already loaded with png_to_data).
void	get_map_image_size (int face, uint8 w, uint8 h)
int	init_pngx_loader (Display *display)
uint8 *	png_to_data (uint8 data, int len, uint32 width, uint32 *height)
int	png_to_xpixmap (Display display, Drawable draw, unsigned char data, int len, Pixmap pix, Pixmap mask, Colormap cmap, unsigned long width, unsigned long *height)
long	pngx_find_color (Display display, Colormap cmap, int red, int green, int blue)
uint8 *	rescale_rgba_data (uint8 data, int width, int *height, int scale)
	Takes png data and scales it accordingly.
int	rgba_to_xpixmap (Display display, Drawable draw, uint8 pixels, Pixmap pix, Pixmap mask, Colormap *cmap, unsigned long width, unsigned long height)
static void	user_read_data (png_structp png_ptr, png_bytep data, png_size_t length)
Variables
static int	bmask = 0
static int	bshift = 0
struct Pngx_Color_Values *	color_values
static int	colormap_size
static int	colors_alloced = 0
static unsigned char *	data_cp
static int	data_len
static int	data_start
static int	gmask = 0
static int	gshift = 8
static int	need_color_alloc = 0
static int	private_cmap = 0
const char *	rcsid_x11_png_c = "$Id: png.c 9195 2008-06-01 15:36:42Z anmaster $"
static int	rev_bshift = 0
static int	rev_gshift = 0
static int	rev_rshift = 0
static int	rmask = 0
static int	rshift = 16
static XImage *	ximage

Define Documentation

#define BPP 4

Definition at line 237 of file png.c.

Referenced by rescale_rgba_data().

#define BRIGHTNESS_FACTOR 1

Definition at line 407 of file png.c.

Referenced by pngx_find_color().

#define COLOR_FACTOR 3

Definition at line 406 of file png.c.

Referenced by pngx_find_color().

#define MAX_IMAGE_HEIGHT 1024

Definition at line 236 of file png.c.

Referenced by rescale_rgba_data().

#define MAX_IMAGE_WIDTH 1024

Definition at line 235 of file png.c.

Referenced by rescale_rgba_data().

#define PNGX_DATA 3

Definition at line 54 of file png.c.

Referenced by png_to_xpixmap().

#define PNGX_NOFILE 1

Definition at line 52 of file png.c.

#define PNGX_OUTOFMEM 2

Definition at line 53 of file png.c.

Referenced by png_to_xpixmap().

#define RATIO 100

Definition at line 233 of file png.c.

Referenced by rescale_rgba_data().

Function Documentation

int create_and_rescale_image_from_data	(	Cache_Entry *	ce,
		int	pixmap_num,
		uint8 *	rgba_data,
		int	width,
		int	height
	)

Takes the pixmap to put the data into, as well as the rgba data (ie, already loaded with png_to_data).

Scales and stores the relevant data into the pixmap structure.

Parameters:

ce	can be NULL
pixmap_num
rgba_data
width
height

Returns:: 1 on failure.

Definition at line 888 of file png.c.

References BPP, CFG_DM_PIXMAP, CFG_DM_SDL, colormap, CONFIG_DISPLAYMODE, CONFIG_ICONSCALE, CONFIG_MAPSCALE, create_icon_image(), create_map_image(), DEFAULT_IMAGE_SIZE, display, free_pixmap(), PixmapInfo::height, height, PixmapInfo::icon_height, PixmapInfo::icon_image, PixmapInfo::icon_mask, icon_rescale_factor, PixmapInfo::icon_width, Cache_Entry::image_data, image_size, PixmapInfo::map_height, PixmapInfo::map_image, PixmapInfo::map_mask, PixmapInfo::map_width, PixmapInfo::mask, mask, MAX_ICON_SPACES, MAXPIXMAPNUM, PixmapInfo::pixmap, pixmap, pixmaps, redraw_needed, rescale_rgba_data(), rgba_to_xpixmap(), use_config, PixmapInfo::width, width, and win_game.

Referenced by display_newpng(), and finish_face_cmd().

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void get_map_image_size	(	int	face,
		uint8 *	w,
		uint8 *	h
	)

Parameters:

face
w
h

Definition at line 929 of file png.c.

References PixmapInfo::height, PixmapInfo::map_height, map_image_size, PixmapInfo::map_width, MAXPIXMAPNUM, pixmaps, and PixmapInfo::width.

Referenced by mapdata_get_image_size().

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int init_pngx_loader ( Display * display )

Definition at line 482 of file png.c.

References bmask, bshift, color_values, colormap_size, gmask, gshift, MAX_IMAGE_SIZE, need_color_alloc, rev_bshift, rev_gshift, rev_rshift, rmask, rshift, and ximage.

Referenced by get_root_display().

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uint8* png_to_data	(	uint8 *	data,
		int	len,
		uint32 *	width,
		uint32 *	height
	)

Parameters:

*data
len
*width
*height

Definition at line 65 of file png.c.

References data_cp, data_len, data_start, height, LOG(), LOG_CRITICAL, and user_read_data().

Referenced by display_newpng(), and finish_face_cmd().

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int png_to_xpixmap	(	Display *	display,
		Drawable	draw,
		unsigned char *	data,
		int	len,
		Pixmap *	pix,
		Pixmap *	mask,
		Colormap *	cmap,
		unsigned long *	width,
		unsigned long *	height
	)

Definition at line 573 of file png.c.

References bmask, bshift, data_cp, data_len, data_start, gmask, gshift, height, need_color_alloc, PNGX_DATA, pngx_find_color(), PNGX_OUTOFMEM, rev_bshift, rev_gshift, rev_rshift, rmask, rshift, user_read_data(), width, and ximage.

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long pngx_find_color	(	Display *	display,
		Colormap *	cmap,
		int	red,
		int	green,
		int	blue
	)

Definition at line 416 of file png.c.

References Pngx_Color_Values::blue, BRIGHTNESS_FACTOR, COLOR_FACTOR, color_values, colormap_size, colors_alloced, Pngx_Color_Values::green, Pngx_Color_Values::pixel_value, private_cmap, and Pngx_Color_Values::red.

Referenced by png_to_xpixmap(), and rgba_to_xpixmap().

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uint8* rescale_rgba_data	(	uint8 *	data,
		int *	width,
		int *	height,
		int	scale
	)

Takes png data and scales it accordingly.

This function is based on pnmscale, but has been modified to support alpha channel - instead of blending the alpha channel, it takes the most opaque value - blending it is not likely to give sane results IMO - for any image that has transparent information, if we blended the alpha, the result would be the edges of that region being partially transparent. This function has also been re-written to use more static data - in the case of the client, it will be called thousands of times, so it doesn't make sense to free the data and then re-allocate it.

For pixels that are fully transparent, the end result after scaling is they will be tranparent black. This is a needed effect for blending to work properly.

This function returns a new pointer to the scaled image data. This is malloc'd data, so should be freed at some point to prevent leaks. This function does not modify the data passed to it - the caller is responsible for freeing it if it is no longer needed.

function arguments:

Parameters:

*data	PNG data - this is any 4 byte per pixel data, in RGBA format.
*width	Source width modified to contain the new image size.
*height	Source height modified to contain the new image size.
scale	Percentage size that new image should be. 100 is a same size image - values larger than 100 will result in zoom, values less than 100 will result in a shrinkage.

Definition at line 239 of file png.c.

References BPP, LOG(), LOG_CRITICAL, MAX_IMAGE_HEIGHT, MAX_IMAGE_WIDTH, RATIO, and width.

Referenced by create_and_rescale_image_from_data().

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int rgba_to_xpixmap	(	Display *	display,
		Drawable	draw,
		uint8 *	pixels,
		Pixmap *	pix,
		Pixmap *	mask,
		Colormap *	cmap,
		unsigned long	width,
		unsigned long	height
	)