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Start commenting plotter functions.

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svn path=/trunk/netsurf/; revision=5324
This commit is contained in:
Michael Drake 2008-09-15 18:14:08 +00:00
parent 83fb0bbb9e
commit 7719e36c28
1 changed files with 36 additions and 7 deletions
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37
desktop/plotters.h
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@ -31,7 +31,37 @@
struct bitmap;
/** Set of target specific plotting functions. */
/** Set of target specific plotting functions.
*
* The functions are:
* clg - Clears plotting area to a flat colour
* arc - Plots an arc, around (x,y), from anticlockwise from angle1 to
* angle2. Angles are measured anticlockwise from horizontal, in
* degrees.
* disc - Plots a circle, centered on (x,y), which is optionally filled.
* line - Plots a line from (x0,y0) to (x1,y1). Coordinates are at
* centre of line width/thickness.
* path -
* polygon - Plots a filled polygon with stright lines between points. The
* lines around the edge of the ploygon are not plotted. The
* polygon is filled with the non-zero winding rule.
* rectangle -
* fill -
* clip -
* text -
* bitmap -
* bitmap_tile -
* group_start -
* group_end -
* flush -
*
* Coordinates are from top left and (0,0) is the top left grid demomination.
*
* Plotter options:
* option_knockout Optimisation particularly for unaccelerated screen
* redraw. It tries to avoid plotting to the same area more
* than once. See desktop/knockout.c
*/
struct plotter_table {
bool (*clg)(colour c);
bool (*rectangle)(int x0, int y0, int width, int height,
@ -44,8 +74,7 @@ struct plotter_table {
bool (*text)(int x, int y, const struct css_style *style,
const char *text, size_t length, colour bg, colour c);
bool (*disc)(int x, int y, int radius, colour c, bool filled);
bool (*arc)(int x, int y, int radius, int angle1, int angle2,
colour c);
bool (*arc)(int x, int y, int radius, int angle1, int angle2, colour c);
bool (*bitmap)(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
struct content *content);
@ -57,7 +86,7 @@ struct plotter_table {
bool (*flush)(void); /**< optional, may be NULL */
bool (*path)(float *p, unsigned int n, colour fill, float width,
colour c, float *transform);
bool option_knockout; /**< when set, avoid areas are replotted more than once. */
bool option_knockout; /**< set if knockout rendering is required */
};
/** Current plotters, must be assigned before use. */