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[paint-extend] More

This commit is contained in:
Behdad Esfahbod 2022-12-23 15:21:48 -07:00
parent 23a2d4dbab
commit 8ca78d1520
1 changed files with 50 additions and 6 deletions
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56
src/hb-paint-extents.hh
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@ -29,6 +29,11 @@
#include "hb-paint.hh"
typedef struct hb_extents_t
{
float xmin, ymin, xmax, ymax;
} hb_extents_t;
typedef struct hb_transform_t
{
hb_transform_t () {}
@ -54,6 +59,49 @@ typedef struct hb_transform_t
*this = r;
}
void transform_distance (float &dx, float &dy)
{
float new_x = xx * dx + xy * dy;
float new_y = yx * dx + yy * dy;
dx = new_x;
dy = new_y;
}
void transform_point (float &x, float &y)
{
transform_distance (x, y);
x += x0;
y += y0;
}
void transform_extents (hb_extents_t extents)
{
float quad_x[4], quad_y[4];
quad_x[0] = extents.xmin;
quad_y[0] = extents.ymin;
quad_x[1] = extents.xmin;
quad_y[1] = extents.ymax;
quad_x[2] = extents.xmax;
quad_y[2] = extents.ymin;
quad_x[3] = extents.xmax;
quad_y[3] = extents.ymax;
for (unsigned i = 0; i < 4; i++)
transform_point (quad_x[i], quad_y[i]);
extents.xmin = extents.xmax = quad_x[0];
extents.ymin = extents.ymax = quad_y[0];
for (unsigned i = 1; i < 4; i++)
{
extents.xmin = hb_min (extents.xmin, quad_x[i]);
extents.ymin = hb_min (extents.ymin, quad_y[i]);
extents.xmax = hb_max (extents.xmax, quad_x[i]);
extents.ymax = hb_max (extents.ymax, quad_y[i]);
}
}
float xx = 1.f;
float yx = 0.f;
float xy = 0.f;
@ -62,11 +110,6 @@ typedef struct hb_transform_t
float y0 = 0.f;
} hb_transform_t;
typedef struct hb_extents_t
{
float xmin, ymin, xmax, ymax;
} hb_extents_t;
typedef struct hb_bounds_t
{
enum status_t {
@ -109,7 +152,8 @@ struct hb_paint_extents_context_t {
void push_clip (hb_extents_t extents)
{
/* Transform extents and push a new clip. */
//hb_transform_t &r = transforms.tail ();
hb_transform_t &r = transforms.tail ();
r.transform_extents (extents);
hb_bounds_t b {extents};
clips.push (b);