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lib: fb: add igt_paint_color_gradient_range

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This is a helper to draw a gradient between 2 colors.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
This commit is contained in:
Lionel Landwerlin 2016-03-18 17:33:02 +00:00 committed by Matt Roper
parent 1716625e1e
commit a511310244
2 changed files with 37 additions and 0 deletions
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34
lib/igt_fb.c
View File

@ -282,6 +282,40 @@ igt_paint_color_gradient(cairo_t *cr, int x, int y, int w, int h,
cairo_pattern_destroy(pat);
}
/**
* igt_paint_color_gradient_range:
* @cr: cairo drawing context
* @x: pixel x-coordination of the fill rectangle
* @y: pixel y-coordination of the fill rectangle
* @w: width of the fill rectangle
* @h: height of the fill rectangle
* @sr: red value to use as start gradient color
* @sg: green value to use as start gradient color
* @sb: blue value to use as start gradient color
* @er: red value to use as end gradient color
* @eg: green value to use as end gradient color
* @eb: blue value to use as end gradient color
*
* This functions draws a gradient into the rectangle which fades in
* from one color to the other using the drawing context @cr.
*/
void
igt_paint_color_gradient_range(cairo_t *cr, int x, int y, int w, int h,
double sr, double sg, double sb,
double er, double eg, double eb)
{
cairo_pattern_t *pat;
pat = cairo_pattern_create_linear(x, y, x + w, y + h);
cairo_pattern_add_color_stop_rgba(pat, 1, sr, sg, sb, 1);
cairo_pattern_add_color_stop_rgba(pat, 0, er, eg, eb, 1);
cairo_rectangle(cr, x, y, w, h);
cairo_set_source(cr, pat);
cairo_fill(cr);
cairo_pattern_destroy(pat);
}
static void
paint_test_patterns(cairo_t *cr, int width, int height)
{

3
lib/igt_fb.h
View File

@ -106,6 +106,9 @@ void igt_paint_color_alpha(cairo_t *cr, int x, int y, int w, int h,
double r, double g, double b, double a);
void igt_paint_color_gradient(cairo_t *cr, int x, int y, int w, int h,
int r, int g, int b);
void igt_paint_color_gradient_range(cairo_t *cr, int x, int y, int w, int h,
double sr, double sg, double sb,
double er, double eg, double eb);
void igt_paint_test_pattern(cairo_t *cr, int width, int height);
void igt_paint_image(cairo_t *cr, const char *filename,
int dst_x, int dst_y, int dst_width, int dst_height);