Edge smoothing systems and methods

1. A computer-implemented method of processing video data to be displayed on a display device having horizontal resolution h 1 and vertical resolution v 1 , wherein the video data has horizontal resolution h 2 and vertical resolution v 2 , wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection onto that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width, the method comprising:

for a resultant video data set having a horizontal resolution less than h 2 , determining a color of an edge resultant pixel in a resultant scan line using, at least in part the slope of the graphics vector at an edge sub-pixel; and

directing the resultant video data set toward the display device;

wherein determining a color of an edge resultant pixel comprises:

determining whether the slope is greater than or equal to 0.4 and whether the edge sub-pixel is at an even location; and

based at least in part upon the determination, determining the color of the edge resultant pixel to be 25% of a color of an immediately adjacent prior sub-pixel plus 75% of the line span color.

2. A computer-implemented method of processing video data to be displayed on a display device having horizontal resolution h 1 and vertical resolution v 1 , wherein the video data has horizontal resolution h 2 and vertical resolution v 2 , wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection onto that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width, the method comprising:

for a resultant video data set having a horizontal resolution less than h 2 , determining a color of an edge resultant pixel in a resultant scan line using, at least in part the slope of the graphics vector at an edge sub-pixel; and

directing the resultant video data set toward the display device;

wherein determining a color of an edge resultant pixel comprises:

determining whether the slope is greater than or equal to 0.4 and whether the edge sub-pixel is at an odd location; and

based upon the determination, determining the color of the edge resultant pixel to be 75% of a color of an immediately adjacent prior sub-pixel plus 25% of the line span color.

3. A computer-implemented method of processing video data to be displayed on a display device having horizontal resolution h 1 and vertical resolution v 1 , wherein the video data has horizontal resolution h 2 and vertical resolution v 2 , wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection onto that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width, the method comprising:

for a resultant video data set having a horizontal resolution less than h 2 , determining a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel; and

directing the resultant video data set toward the display device;

wherein determining a color of an edge resultant pixel comprises:

determining whether the slope is less than 0.4; and

based at least in part upon the determination, determining the color of the edge resultant pixel to be 50% of a color of an immediately adjacent prior sub-pixel plus 50% of the line span color;

the method further comprising:

determining a color of a second resultant pixel to be 25% of the color of the immediately adjacent prior sub-pixel plus 75% of the line span color.

4. A computer-implemented method of processing video data to be displayed on a display device having horizontal resolution h 1 and vertical resolution v 1 , wherein the video data has horizontal resolution h 2 and vertical resolution v 2 , wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection onto that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width, the method comprising:

for a resultant video data set having a horizontal resolution less than h 2 , determining a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel; and

directing the resultant video data set toward the display device;

wherein h 2 =2h 1 and v 2 =1.5v 1 , wherein the resultant video data set has a plurality of horizontal scan lines each representing a plurality of pixels, whereby the pixels are comprised by groups of three vertically-aligned pixels comprising a top pixel, a middle pixel, and a bottom pixel, each pixel having a color, the method further comprising:

for each group of three vertically-aligned pixels:

determining a color of a top resultant pixel to be 75% of the top pixel's color plus 25% of the middle pixel's color; and

determining a color of a bottom resultant pixel to be 25% of the middle pixel's color plus 75% of the bottom pixel's color.

5. A graphics device, comprising:

a vector graphics rendering engine configured to produce video data to be displayed on a display device, wherein the video data comprises a horizontal resolution and a vertical resolution, wherein the horizontal resolution is twice a horizontal resolution of the display device, wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection on that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width; and

at least one filter configured to receive the video data from the vector graphics rendering engine and determine a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel and direct a resultant video data set comprising the resultant scan line toward the display device;

wherein the at least one filter is further configured to determine the color of the edge resultant pixel at least in part by:

determining whether the slope is greater than or equal to 0.4 and whether the edge sub-pixel is at an even location; and

based at least in part upon the determination, determining the color of the edge resultant pixel to be 25% of a color of an immediately adjacent prior sub-pixel plus 75% of the line span color.

6. A graphics device, comprising:

a vector graphics rendering engine configured to produce video data to be displayed on a display device, wherein the video data comprises a horizontal resolution and a vertical resolution, wherein the horizontal resolution is twice a horizontal resolution of the display device, wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection on that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width; and

at least one filter configured to receive the video data from the vector graphics rendering engine and determine a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel and direct a resultant video data set comprising the resultant scan line toward the display device;

wherein the at least one filter is further configured to determine the color of the edge resultant pixel at least in part by:

determining whether the slope is greater than or equal to 0.4 and whether the edge sub-pixel is at an odd location; and

based upon the determination, determining the color of the edge resultant pixel to be 75% of a color of an immediately adjacent prior sub-pixel plus 25% of the line span color.

7. A graphics device, comprising:

a vector graphics rendering engine configured to produce video data to be displayed on a display device, wherein the video data comprises a horizontal resolution and a vertical resolution, wherein the horizontal resolution is twice a horizontal resolution of the display device, wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection on that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width; and

at least one filter configured to receive the video data from the vector graphics rendering engine and determine a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel and direct a resultant video data set comprising the resultant scan line toward the display device;

wherein the at least one filter is further configured to determine the color of the edge resultant pixel at least in part by:

determining whether the slope is less than 0.4; and

based at least in part upon the determination, determining the color of the edge resultant pixel to be 50% of a color of an immediately adjacent prior sub-pixel plus 50% of the line span color.

8. A graphics device, comprising:

a vector graphics rendering engine configured to produce video data to be displayed on a display device, wherein the video data comprises a horizontal resolution and a vertical resolution, wherein the horizontal resolution is twice a horizontal resolution of the display device, wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection on that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width; and

at least one filter configured to receive the video data from the vector graphics rendering engine and determine a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel and direct a resultant video data set comprising the resultant scan line toward the display device;

wherein the vertical resolution is 1.5 times a vertical resolution of the display device, wherein the resultant video data set has a plurality of horizontal scan lines each representing a plurality of pixels, whereby the pixels are comprised by groups of three vertically-aligned pixels comprising a top pixel, a middle pixel, and a bottom pixel, each pixel having a color, the graphics device comprising:

at least a second filter configured to, for each group of three vertically-aligned pixels:

determine a color of a top resultant pixel to be 75% of the top pixel's color plus 25% of the middle pixel's color; and

determine a color of a bottom resultant pixel to be 25% of the middle pixel's color plus 75% of the bottom pixel's color.

9. A computer-readable medium having stored thereon:

code for receive video data to be displayed on a display device from a vector graphics rendering engine, wherein the video data comprises a horizontal resolution and a vertical resolution, wherein the horizontal resolution is twice a resolution of the display device, wherein the video data comprises a plurality of scan lines, wherein at least one scan line has at least one line span representing the projection on that scan line of a graphics vector rendered in the video data, and wherein the graphics vector has a slope and the line span has a color and a width; and

code for determining, in a resultant data set, a color of an edge resultant pixel in a resultant scan line using, at least in part, the slope of the graphics vector at an edge sub-pixel;

wherein the resultant data set comprises a plurality of horizontal scan lines each representing a plurality of pixels, whereby the pixels are comprised by groups of three vertically-aligned pixels comprising a top pixel, a middle pixel, and a bottom pixel, each pixel having a color, the computer-readable medium further comprising:

code for determining a color of a top resultant pixel to be 75% of the top pixel's color plus 25% of the middle pixel's color; and

code for determining a color of a bottom resultant pixel to be 25% of the middle pixel's color plus 75% of the bottom pixel's color.