image_png.c File Reference

PNG image functions. More...

#include <string.h>
#include <png.h>
#include "techtype.h"
#include "dbgfuncs.h"
#include "stbheap.h"

Classes
struct	S_PNG_BUFFER
struct	S_PNG_READER

Macros
#define	DBG(x)
#define	PNG_HEADER_SIZE   8
#define	ST_ALPHA(x)   (((x) * 128 + 127) / 255)

Functions
BOOLEAN	STB_IMGConvertPNG (U8BIT *image_data, U32BIT image_data_size, U8BIT **output_data, U32BIT *output_data_size, U16BIT *pixel_width, U16BIT *pixel_height)
	Converts the given PNG image data to a bitmap image that can be displayed on-screen with the given bit depth. More...

Detailed Description

PNG image functions.

Date

22 November 2010

Author

Steve Ford

Function Documentation

BOOLEAN STB_IMGConvertPNG	(	U8BIT *	image_data,
		U32BIT	image_data_size,
		U8BIT **	output_data,
		U32BIT *	output_data_size,
		U16BIT *	pixel_width,
		U16BIT *	pixel_height
	)

Converts the given PNG image data to a bitmap image that can be displayed on-screen with the given bit depth.

---

Parameters

image_data	- PNG image data
image_data_size	- number of PNG image data bytes
output_data	- address of pointer to buffer allocated for output data
output_data_size	- pointer to number of bytes in output bitmap
pixel_width	- pointer to returned width in pixels
pixel_height	- pointer to returned height in pixels

Returns

TRUE if image data is a valid PNG and conversion succeeds, FALSE otherwise