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Software » c6000 graphics overlay system

C6000 graphics overlay system

Project name:		C6000 graphics overlay system
Language:		ANSI C, with CCS3.3 extensions and assembler
Target platform:		c6000, including DM642 and DM648
Abstract:		This software module takes in a video stream and overlays customisable graphics including bitmaps, text, lines, circles etc
Key features and advantages:		The software is a complete tested solution, the library has been heavily optimised to be efficient on the pipelined c6000 achitecture. For a typical D1 screen with about 30 graphics coverage, CPU loading is about 10% on a 600MHz DM642. The graphics are of the highest quality and are fully anti aliased and alpha blended.

Full Description

Graphics overlay system is a high quality graphic object blending tool which is suitable to use with embedded video applications. This library is originally developed to blend graphical objects to a D1 PAL (720 x 576 x 25fps) video source on Ti c6000 platform. Apart from that, it is also capable to draw another video source as Picture in Picture (PIP) to the main video source.

Overview of the C6000 graphics overlay system

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1. void DrawAALine (

int x1, int y1,

int x2, int y2,

unsigned char y, unsigned char u, unsigned char v,

unsigned char ThickLine,

unsigned short Alpha,

unsigned int line1, unsigned int line2 )

This function draws an anti-aliased line to the global canvas.

Parameters:      x1, y1              -           Start position

x2, y2              -           End position

y, u, v              -           Colour in YUV format

ThickLine        -           0 - Normal Line          1-Think Line

Alpha              -           Opacity control  [0..255]

0 - invisible, 255 - Opaque

Line1, line2     -           Upper & lower values of Overlay Block

2. void BlendRectangle (

int x1, int y1,

int x2, int y2,

unsigned char y, unsigned char u, unsigned char v,

unsigned int row1, unsigned int row2,

unsigned short alpha_c ) 

This function blends a filled Rectangle to the global canvas.

Parameters:      x1, y1              -           Top-left position

x2, y2              -           Right-Bottom position

y, u, v              -           Colour in YUV format

row1, row2      -           Upper & lower values of Overlay Block

alpha_c            -           Opacity control  [0..255]

0 - invisible, 255 - Opaque 

3. void DrawRectangle (

int x1, int y1,

int x2, int y2,

unsigned char y, unsigned char u, unsigned char v,

unsigned short row1, unsigned short row2)

This function draws a opaque filled Rectangle to the global canvas. 

Parameters:      x1, y1              -           Top-left position

x2, y2              -           Right-Bottom position

y, u, v              -           Colour in YUV format

row1, row2      -           Upper & lower values of Overlay Block 

4. void Draw_BMP (

int top_y,

bitmap *bmp) 

This function blends a BMP given by the bmp object. 

Parameters:      top_y               -           upper value of Overlay block

bmp                 -           Bitmap object 

5. void OpenFont (

unsigned char *fn_array,

RTGlyph *rtg) 

Opens & initializes an RTG font file. This must be used before using a font type.

Parameters:      fn_array           -           Start position of RTG font

rtg                    -           Font object to be initialised for this font 

6. void BlendText_left (

int blk_top, int blk_bottom,

RTGlyph *rtg,

char *text,

short textlen,

short x, short y,

unsigned char lum, unsigned char chro_u, unsigned char chro_v,

unsigned char alpha_c) 

This function is used to blend a left aligned text to the global canvas. 

Parameters:      blk_top, blk_bottom   -           Upper & lower values of Overlay Block

rtg                                -           Font to be used to print this text

text                              -           Text buffer representing the string to be printed

textlen                         -           Number of characters in the Text

x, y                              -           Left position of the text

lum, chro_u, chro_v    -           Colour in YUV format

alpha_c                        -           Opacity control  [0..255]

0 - invisible, 255 - Opaque 

7. void BlendText_right (

int blk_top, int blk_bottom,

RTGlyph *rtg,

char *text,

short textlen,

short x, short y,

unsigned char lum, unsigned char chro_u, unsigned char chro_v,

unsigned char alpha_c) 

This function is used to blend a right aligned text to the global canvas.

Parameters:      blk_top, blk_bottom   -           Upper & lower values of Overlay Block

rtg                                -           Font to be used to print this text

text                              -           Text buffer representing the string to be printed

textlen                         -           Number of characters in the Text

x, y                              -           Right position of the text

lum, chro_u, chro_v    -           Colour in YUV format

alpha_c                        -           Opacity control  [0..255]

0 - invisible, 255 - Opaque 

8. void CentreCoord (

RTGlyph *rtg,

char *text,

short textlen,

int *leftPos, int *botPos)

This function is used to find the centre of a given text string. 

Parameters:      rtg                                -           Font to be used to print this text

text                              -           Text buffer representing the string to be printed

textlen                         -           Number of characters in the Text

leftPos                         -           X postion

botPos                         -           Y position

void closeFont (

RTGlyph *rtg)

This function is used to close an already open font object. 

Parameters:      rtg                                -           Font object