#include <config.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>
#include <png.h>
#include <client-types.h>
#include <client.h>
#include <gtk/gtk.h>
#include <gdk/gdkx.h>
#include <gdk/gdkkeysyms.h>

Include dependency graph for png.c:

Macros
#define	BPP 4

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

int	png_to_gdkpixmap (GdkWindow window, uint8 data, int len, GdkPixmap pix, GdkBitmap mask, GdkColormap *colormap)

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

int	rgba_to_gdkpixbuf (uint8 data, int width, int height, GdkPixbuf *pix)

int	rgba_to_gdkpixmap (GdkWindow window, uint8 data, int width, int height, GdkPixmap pix, GdkBitmap mask, GdkColormap *colormap)

static void	user_read_data (png_structp png_ptr, png_bytep data, png_size_t length)

Variables
static uint8 *	data_cp

static int	data_len

static int	data_start

const char *const	rcsid_gtk2_png_c

guchar	rgb [512 512 3]

Detailed Description

Functions for manipulating graphics in the GTK-V2 client.

Definition in file png.c.

Macro Definition Documentation

#define BPP 4

Definition at line 237 of file png.c.

Referenced by rescale_rgba_data().

#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 57 of file png.c.

Referenced by png_to_gdkpixmap().

#define PNGX_NOFILE 1

Definition at line 55 of file png.c.

#define PNGX_OUTOFMEM 2

Definition at line 56 of file png.c.

Referenced by png_to_gdkpixmap().

#define RATIO 100

Definition at line 233 of file png.c.

Referenced by rescale_rgba_data().

Function Documentation

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

Parameters

*data
len
*width
*height

Definition at line 80 of file png.c.

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

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int png_to_gdkpixmap	(	GdkWindow *	window,
		uint8 *	data,
		int	len,
		GdkPixmap **	pix,
		GdkBitmap **	mask,
		GdkColormap *	colormap
	)

Parameters

*window
*data
len
**pix
**mask
*colormap

Definition at line 544 of file png.c.

References data_cp, data_len, data_start, height, PNGX_DATA, PNGX_OUTOFMEM, rgb, user_read_data(), and width.

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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 267 of file png.c.

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

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int rgba_to_gdkpixbuf	(	uint8 *	data,
		int	width,
		int	height,
		GdkPixbuf **	pix
	)

Takes data that has already been converted into RGBA format (via png_to_data above perhaps) and creates a GdkPixbuf of it.

Parameters

*data
width
height
**pix

Returns: Non-zero on error (currently, no checks for error conditions is done

Definition at line 500 of file png.c.

References height, TRUE, and width.

Referenced by create_icon_image().

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int rgba_to_gdkpixmap	(	GdkWindow *	window,
		uint8 *	data,
		int	width,
		int	height,
		GdkPixmap **	pix,
		GdkBitmap **	mask,
		GdkColormap *	colormap
	)

Takes data that has already been converted into RGBA format (via png_to_data above perhaps) and creates a GdkPixmap and GdkBitmap out of it.

Parameters

*window
*data
width
height
**pix
**mask
*colormap

Returns: Non-zero on error (currently, no checks for error conditions is done

Definition at line 441 of file png.c.

References height, and width.

Referenced by create_icon_image(), and create_map_image().

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static void user_read_data	(	png_structp	png_ptr,
		png_bytep	data,
		png_size_t	length
	)

static

Parameters

png_ptr
data
length

Definition at line 68 of file png.c.

References data_cp, and data_start.

Referenced by png_to_data(), and png_to_gdkpixmap().

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Variable Documentation

uint8* data_cp

static

Definition at line 59 of file png.c.

Referenced by png_to_data(), png_to_gdkpixmap(), and user_read_data().

int data_len

static

Definition at line 60 of file png.c.

Referenced by png_to_data(), and png_to_gdkpixmap().

int data_start

static

Definition at line 60 of file png.c.

Referenced by png_to_data(), png_to_gdkpixmap(), and user_read_data().

const char* const rcsid_gtk2_png_c

Initial value:

=

"$Id: png.c 9193 2008-06-01 14:26:32Z anmaster $"

Definition at line 1 of file png.c.

guchar rgb[512 *512 *3]

Make this especially big to support larger images in the future

Definition at line 425 of file png.c.

Referenced by png_to_gdkpixmap().

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

Function Documentation

Variable Documentation