source/decoder/src/mg_bitmap.c File Reference

Implementation of Bitmap functionality. More...

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "glue_memory.h"
#include "glue_debug.h"
#include "osd_utils.h"
#include "mg_ctxt.h"
#include "stb_osd.h"
#include "decoder.h"

Data Structures
struct	S_COLOUR
Typedefs
typedef U32BIT	HD4Color
Functions
S_COLOUR	MeanArgbCol (S_COLOUR cola, U32BIT weighta, S_COLOUR colb, U32BIT weightb)
void *	DEC_OSDCreateBmpSurf (U32BIT s_width, U32BIT s_height, U32BIT i_width, U32BIT i_height, S_IMAGE *image, U32BIT *pStride)
	This creates a hardware surface of size using STB_OSDMhegCreateSurface() with s_width and s_height, and fills the surface with the IMAGE data. The bitmap must be stretched or shrunk onto surface with image size (i_width,i_height) When surface size is greater than image size, then the bitmap is 'tiled' to fill the surface. Otherwise sizes will be equal. Implementations may choose to ignore requested surface size and leave MHEG5 to do the tiling (where graphic memory is limited). If so, 'tiled' should be set to FALSE, and use (i_width,i_height) for surface size. Colour format of resulting surface is as used in the call to MHEG5_Open() with 'ColourDepth' in setup config.

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Detailed Description

Implementation of Bitmap functionality.

Date:

28/05/2009

Author:

Adam Sturtridge

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Function Documentation

void* DEC_OSDCreateBmpSurf	(	U32BIT	s_width,
		U32BIT	s_height,
		U32BIT	i_width,
		U32BIT	i_height,
		S_IMAGE *	image,
		U32BIT *	pStride
	)

This creates a hardware surface of size using STB_OSDMhegCreateSurface() with s_width and s_height, and fills the surface with the IMAGE data. The bitmap must be stretched or shrunk onto surface with image size (i_width,i_height) When surface size is greater than image size, then the bitmap is 'tiled' to fill the surface. Otherwise sizes will be equal. Implementations may choose to ignore requested surface size and leave MHEG5 to do the tiling (where graphic memory is limited). If so, 'tiled' should be set to FALSE, and use (i_width,i_height) for surface size. Colour format of resulting surface is as used in the call to MHEG5_Open() with 'ColourDepth' in setup config.

Parameters:

s_width	Width of requested surface in pixels
s_height	Height of requested surface in pixels
i_width	Width of image on surface in pixels
i_height	Height of image on surface in pixels
image	image structure returned by DEC_DecodePNG() or DEC_DecodeJPG()
pitch	width of returned buffer in bytes.

Returns:

void* Success - Handle to surface. Failure - NULL (or zero)