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https://github.com/netsurf-browser/netsurf
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Update plotter API to pass context
This commit is contained in:
Vincent Sanders
parent
f1c98ccfa4
commit
98ccc9fe18
@ -31,6 +31,7 @@
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struct bitmap;
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struct rect;
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struct plotter_table;
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typedef unsigned long bitmap_flags_t;
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#define BITMAPF_NONE 0
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@ -44,50 +45,45 @@ enum path_command {
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PLOTTER_PATH_BEZIER,
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};
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/** Set of target specific plotting functions.
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/**
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* Redraw context
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*/
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struct redraw_context {
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/**
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* Redraw to show interactive features.
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*
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* The functions are:
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* arc - Plots an arc, around (x,y), from anticlockwise from angle1 to
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* angle2. Angles are measured anticlockwise from horizontal, in
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* degrees.
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* disc - Plots a circle, centered on (x,y), which is optionally filled.
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* line - Plots a line from (x0,y0) to (x1,y1). Coordinates are at
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* centre of line width/thickness.
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* path - Plots a path consisting of cubic Bezier curves. Line colour is
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* given by c and fill colour is given by fill.
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* polygon - Plots a filled polygon with straight lines between points.
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* The lines around the edge of the ploygon are not plotted. The
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* polygon is filled with the non-zero winding rule.
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* rectangle - Plots a rectangle outline. The line can be solid, dotted or
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* dashed. Top left corner at (x0,y0) and rectangle has given
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* width and height.
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* fill - Plots a filled rectangle. Top left corner at (x0,y0), bottom
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* right corner at (x1,y1). Note: (x0,y0) is inside filled area,
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* but (x1,y1) is below and to the right. See diagram below.
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* clip - Sets a clip rectangle for subsequent plots.
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* text - Plots text. (x,y) is the coordinate of the left hand side of
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* the text's baseline. The text is UTF-8 encoded. The colour, c,
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* is the colour of the text. Background colour, bg, may be used
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* optionally to attempt to provide anti-aliased text without
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* screen reads. Font information is provided in the style.
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* bitmap - Tiled plot of a bitmap image. (x,y) gives the top left
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* coordinate of an explicitly placed tile. From this tile the
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* image can repeat in all four directions -- up, down, left and
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* right -- to the extents given by the current clip rectangle.
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* The bitmap_flags say whether to tile in the x and y
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* directions. If not tiling in x or y directions, the single
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* image is plotted. The width and height give the dimensions
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* the image is to be scaled to.
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* group_start - Start of a group of objects. Used when plotter implements
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* export to a vector graphics file format. (Optional.)
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* group_end - End of the most recently started group. (Optional.)
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* flush - Only used internally by the knockout code. Should be NULL in
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* any front end display plotters or export plotters.
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* Active features include selections etc.
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*
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* Plotter options:
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* option_knockout - Optimisation particularly for unaccelerated screen
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* redraw. It tries to avoid plotting to the same area
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* more than once. See desktop/knockout.c
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* \note Should be off for printing.
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*/
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bool interactive;
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/**
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* Render background images.
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*
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* \note May want it off for printing.
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*/
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bool background_images;
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/**
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* Current plot operation table
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*
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* \warning must be assigned before use.
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*/
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const struct plotter_table *plot;
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/**
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* Private context.
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*
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* Private context allows callers to pass context through to
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* plot operations without using a global.
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*/
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void *priv;
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};
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/**
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* Plotter operations table.
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*
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* Coordinates are from top left of canvas and (0,0) is the top left grid
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* denomination. If a "fill" is drawn from (0,0) to (4,3), the result is:
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@ -101,61 +97,189 @@ enum path_command {
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* 2 |#|#|#|#| |
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* +-+-+-+-+-+-
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* 3 | | | | | |
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*
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*/
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struct plotter_table {
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/* clipping operations */
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bool (*clip)(const struct rect *clip);
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/* shape primatives */
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bool (*arc)(int x, int y, int radius, int angle1, int angle2, const plot_style_t *pstyle);
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bool (*disc)(int x, int y, int radius, const plot_style_t *pstyle);
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bool (*line)(int x0, int y0, int x1, int y1, const plot_style_t *pstyle);
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bool (*rectangle)(int x0, int y0, int x1, int y1, const plot_style_t *pstyle);
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bool (*polygon)(const int *p, unsigned int n, const plot_style_t *pstyle);
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/* complex path (for SVG) */
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bool (*path)(const float *p, unsigned int n, colour fill, float width,
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colour c, const float transform[6]);
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/* Image */
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bool (*bitmap)(int x, int y, int width, int height,
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struct bitmap *bitmap, colour bg,
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bitmap_flags_t flags);
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/**
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* \brief Sets a clip rectangle for subsequent plot operations.
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*
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* \param ctx The current redraw context.
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* \param clip The rectangle to limit all subsequent plot
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* operations within.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*clip)(const struct redraw_context *ctx, const struct rect *clip);
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/**
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* Text.
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* Plots an arc
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*
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* plot an arc segment around (x,y), anticlockwise from angle1
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* to angle2. Angles are measured anticlockwise from
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* horizontal, in degrees.
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*
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* \param ctx The current redraw context.
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* \param pstyle Style controlling the arc plot.
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* \param x The x coordinate of the arc.
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* \param y The y coordinate of the arc.
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* \param radius The radius of the arc.
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* \param angle1 The start angle of the arc.
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* \param angle2 The finish angle of the arc.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*arc)(const struct redraw_context *ctx, const plot_style_t *pstyle, int x, int y, int radius, int angle1, int angle2);
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/**
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* Plots a circle
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*
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* Plot a circle centered on (x,y), which is optionally filled.
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*
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* \param ctx The current redraw context.
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* \param pstyle Style controlling the circle plot.
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* \param x The x coordinate of the circle.
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* \param y The y coordinate of the circle.
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* \param radius The radius of the circle.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*disc)(const struct redraw_context *ctx, const plot_style_t *pstyle, int x, int y, int radius);
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/**
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* Plots a line
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*
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* plot a line from (x0,y0) to (x1,y1). Coordinates are at
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* centre of line width/thickness.
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*
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* \param ctx The current redraw context.
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* \param pstyle Style controlling the line plot.
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* \param line A rectangle defining the line to be drawn
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*line)(const struct redraw_context *ctx, const plot_style_t *pstyle, const struct rect *line);
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/**
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* Plots a rectangle.
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*
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* The rectangle can be filled an outline or both controlled
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* by the plot style The line can be solid, dotted or
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* dashed. Top left corner at (x0,y0) and rectangle has given
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* width and height.
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*
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* \param ctx The current redraw context.
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* \param pstyle Style controlling the rectangle plot.
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* \param rect A rectangle defining the line to be drawn
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*rectangle)(const struct redraw_context *ctx, const plot_style_t *pstyle, const struct rect *rectangle);
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/**
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* Plot a polygon
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*
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* Plots a filled polygon with straight lines between
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* points. The lines around the edge of the ploygon are not
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* plotted. The polygon is filled with the non-zero winding
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* rule.
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*
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* \param ctx The current redraw context.
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* \param pstyle Style controlling the polygon plot.
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* \param p verticies of polygon
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* \param n number of verticies.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*polygon)(const struct redraw_context *ctx, const plot_style_t *pstyle, const int *p, unsigned int n);
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/**
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* Plots a path.
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*
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* Path plot consisting of cubic Bezier curves. Line and fill colour is
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* controlled by the plot style.
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*
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* \param ctx The current redraw context.
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* \param pstyle Style controlling the path plot.
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* \param p elements of path
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* \param n nunber of elements on path
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* \param width The width of the path
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* \param transform A transform to apply to the path.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*path)(const struct redraw_context *ctx, const plot_style_t *pstyle, const float *p, unsigned int n, float width, const float transform[6]);
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/**
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* Plot a bitmap
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*
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* Tiled plot of a bitmap image. (x,y) gives the top left
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* coordinate of an explicitly placed tile. From this tile the
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* image can repeat in all four directions -- up, down, left
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* and right -- to the extents given by the current clip
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* rectangle.
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*
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* The bitmap_flags say whether to tile in the x and y
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* directions. If not tiling in x or y directions, the single
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* image is plotted. The width and height give the dimensions
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* the image is to be scaled to.
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*
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* \param ctx The current redraw context.
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* \param bitmap The bitmap to plot
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* \param x The x coordinate to plot the bitmap
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* \param y The y coordiante to plot the bitmap
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* \param width The width of area to plot the bitmap into
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* \param height The height of area to plot the bitmap into
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* \param bg the background colour to alpha blend into
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* \param flags the flags controlling the type of plot operation
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*bitmap)(const struct redraw_context *ctx, struct bitmap *bitmap, int x, int y, int width, int height, colour bg, bitmap_flags_t flags);
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/**
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* Text plotting.
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*
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* \param ctx The current redraw context.
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* \param fstyle plot style for this text
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* \param x x coordinate
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* \param y y coordinate
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* \param text UTF-8 string to plot
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* \param length length of string, in bytes
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* \param fstyle plot style for this text
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* \return true on success, false on error and error reported
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* \return NSERROR_OK on success else error code.
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*/
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bool (*text)(int x, int y, const char *text, size_t length,
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const plot_font_style_t *fstyle);
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nserror (*text)(const struct redraw_context *ctx, const plot_font_style_t *fstyle, int x, int y, const char *text, size_t length);
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/* optional callbacks */
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bool (*group_start)(const char *name); /**< optional, may be NULL */
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bool (*group_end)(void); /**< optional, may be NULL */
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bool (*flush)(void); /**< optional, may be NULL */
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/**
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* Start of a group of objects.
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*
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* optional, may be NULL. Used when plotter implements export
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* to a vector graphics file format.
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*
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* \param ctx The current redraw context.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*group_start)(const struct redraw_context *ctx, const char *name);
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/**
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* End of the most recently started group.
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*
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* optional, may be NULL
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*
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* \param ctx The current redraw context.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*group_end)(const struct redraw_context *ctx);
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/**
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* Only used internally by the knockout code. Must be NULL in
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* any front end display plotters or export plotters.
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*
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* \param ctx The current redraw context.
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* \return NSERROR_OK on success else error code.
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*/
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nserror (*flush)(const struct redraw_context *ctx);
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/* flags */
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bool option_knockout; /**< set if knockout rendering is required */
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};
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/* Redraw context */
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struct redraw_context {
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/** Redraw to show interactive features, such as active selections
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* etc. Should be off for printing. */
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bool interactive;
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/** Render background images. May want it off for printing. */
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bool background_images;
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/** Current plotters, must be assigned before use. */
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const struct plotter_table *plot;
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/**
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* flag to enable knockout rendering.
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*
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* Optimisation particularly for unaccelerated screen
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* redraw. It tries to avoid plotting to the same area more
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* than once. See desktop/knockout.c
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*/
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bool option_knockout;
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};
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#endif
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