kolibrios-gitea/contrib/media/updf/draw/draw_affine.c
right-hearted 4f7ee97ec9 uPDF with buttons
git-svn-id: svn://kolibrios.org@4680 a494cfbc-eb01-0410-851d-a64ba20cac60
2014-03-22 21:00:40 +00:00

589 lines
15 KiB
C

#include "fitz.h"
typedef unsigned char byte;
static inline float roundup(float x)
{
return (x < 0) ? floorf(x) : ceilf(x);
}
static inline int lerp(int a, int b, int t)
{
return a + (((b - a) * t) >> 16);
}
static inline int bilerp(int a, int b, int c, int d, int u, int v)
{
return lerp(lerp(a, b, u), lerp(c, d, u), v);
}
static inline byte *sample_nearest(byte *s, int w, int h, int n, int u, int v)
{
if (u < 0) u = 0;
if (v < 0) v = 0;
if (u >= w) u = w - 1;
if (v >= h) v = h - 1;
return s + (v * w + u) * n;
}
/* Blend premultiplied source image in constant alpha over destination */
static inline void
fz_paint_affine_alpha_N_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *hp)
{
int k;
int n1 = n-1;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = sample_nearest(sp, sw, sh, n, ui, vi);
byte *b = sample_nearest(sp, sw, sh, n, ui+1, vi);
byte *c = sample_nearest(sp, sw, sh, n, ui, vi+1);
byte *d = sample_nearest(sp, sw, sh, n, ui+1, vi+1);
int xa = bilerp(a[n1], b[n1], c[n1], d[n1], uf, vf);
int t;
xa = fz_mul255(xa, alpha);
t = 255 - xa;
for (k = 0; k < n1; k++)
{
int x = bilerp(a[k], b[k], c[k], d[k], uf, vf);
dp[k] = fz_mul255(x, alpha) + fz_mul255(dp[k], t);
}
dp[n1] = xa + fz_mul255(dp[n1], t);
if (hp)
hp[0] = xa + fz_mul255(hp[n1], t);
}
dp += n;
if (hp)
hp++;
u += fa;
v += fb;
}
}
/* Special case code for gray -> rgb */
static inline void
fz_paint_affine_alpha_g2rgb_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int alpha, byte *hp)
{
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = sample_nearest(sp, sw, sh, 2, ui, vi);
byte *b = sample_nearest(sp, sw, sh, 2, ui+1, vi);
byte *c = sample_nearest(sp, sw, sh, 2, ui, vi+1);
byte *d = sample_nearest(sp, sw, sh, 2, ui+1, vi+1);
int y = bilerp(a[1], b[1], c[1], d[1], uf, vf);
int x = bilerp(a[0], b[0], c[0], d[0], uf, vf);
int t;
x = fz_mul255(x, alpha);
y = fz_mul255(y, alpha);
t = 255 - y;
dp[0] = x + fz_mul255(dp[0], t);
dp[1] = x + fz_mul255(dp[1], t);
dp[2] = x + fz_mul255(dp[2], t);
dp[3] = y + fz_mul255(dp[3], t);
if (hp)
hp[0] = y + fz_mul255(hp[0], t);
}
dp += 4;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static inline void
fz_paint_affine_alpha_N_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *hp)
{
int k;
int n1 = n-1;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
byte *sample = sp + ((vi * sw + ui) * n);
int a = fz_mul255(sample[n-1], alpha);
int t = 255 - a;
for (k = 0; k < n1; k++)
dp[k] = fz_mul255(sample[k], alpha) + fz_mul255(dp[k], t);
dp[n1] = a + fz_mul255(dp[n1], t);
if (hp)
hp[0] = a + fz_mul255(hp[n1], t);
}
dp += n;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static inline void
fz_paint_affine_alpha_g2rgb_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int alpha, byte *hp)
{
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
byte *sample = sp + ((vi * sw + ui) * 2);
int x = fz_mul255(sample[0], alpha);
int a = fz_mul255(sample[1], alpha);
int t = 255 - a;
dp[0] = x + fz_mul255(dp[0], t);
dp[1] = x + fz_mul255(dp[1], t);
dp[2] = x + fz_mul255(dp[2], t);
dp[3] = a + fz_mul255(dp[3], t);
if (hp)
hp[0] = a + fz_mul255(hp[0], t);
}
dp += 4;
if (hp)
hp++;
u += fa;
v += fb;
}
}
/* Blend premultiplied source image over destination */
static inline void
fz_paint_affine_N_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, byte *hp)
{
int k;
int n1 = n-1;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = sample_nearest(sp, sw, sh, n, ui, vi);
byte *b = sample_nearest(sp, sw, sh, n, ui+1, vi);
byte *c = sample_nearest(sp, sw, sh, n, ui, vi+1);
byte *d = sample_nearest(sp, sw, sh, n, ui+1, vi+1);
int y = bilerp(a[n1], b[n1], c[n1], d[n1], uf, vf);
int t = 255 - y;
for (k = 0; k < n1; k++)
{
int x = bilerp(a[k], b[k], c[k], d[k], uf, vf);
dp[k] = x + fz_mul255(dp[k], t);
}
dp[n1] = y + fz_mul255(dp[n1], t);
if (hp)
hp[0] = y + fz_mul255(hp[0], t);
}
dp += n;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static inline void
fz_paint_affine_solid_g2rgb_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, byte *hp)
{
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = sample_nearest(sp, sw, sh, 2, ui, vi);
byte *b = sample_nearest(sp, sw, sh, 2, ui+1, vi);
byte *c = sample_nearest(sp, sw, sh, 2, ui, vi+1);
byte *d = sample_nearest(sp, sw, sh, 2, ui+1, vi+1);
int y = bilerp(a[1], b[1], c[1], d[1], uf, vf);
int t = 255 - y;
int x = bilerp(a[0], b[0], c[0], d[0], uf, vf);
dp[0] = x + fz_mul255(dp[0], t);
dp[1] = x + fz_mul255(dp[1], t);
dp[2] = x + fz_mul255(dp[2], t);
dp[3] = y + fz_mul255(dp[3], t);
if (hp)
hp[0] = y + fz_mul255(hp[0], t);
}
dp += 4;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static inline void
fz_paint_affine_N_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, byte *hp)
{
int k;
int n1 = n-1;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
byte *sample = sp + ((vi * sw + ui) * n);
int a = sample[n1];
int t = 255 - a;
for (k = 0; k < n1; k++)
dp[k] = sample[k] + fz_mul255(dp[k], t);
dp[n1] = a + fz_mul255(dp[n1], t);
if (hp)
hp[0] = a + fz_mul255(hp[0], t);
}
dp += n;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static inline void
fz_paint_affine_solid_g2rgb_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, byte *hp)
{
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
byte *sample = sp + ((vi * sw + ui) * 2);
int x = sample[0];
int a = sample[1];
int t = 255 - a;
dp[0] = x + fz_mul255(dp[0], t);
dp[1] = x + fz_mul255(dp[1], t);
dp[2] = x + fz_mul255(dp[2], t);
dp[3] = a + fz_mul255(dp[3], t);
if (hp)
hp[0] = a + fz_mul255(hp[0], t);
}
dp += 4;
if (hp)
hp++;
u += fa;
v += fb;
}
}
/* Blend non-premultiplied color in source image mask over destination */
static inline void
fz_paint_affine_color_N_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, byte *color, byte *hp)
{
int n1 = n - 1;
int sa = color[n1];
int k;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
int uf = u & 0xffff;
int vf = v & 0xffff;
byte *a = sample_nearest(sp, sw, sh, 1, ui, vi);
byte *b = sample_nearest(sp, sw, sh, 1, ui+1, vi);
byte *c = sample_nearest(sp, sw, sh, 1, ui, vi+1);
byte *d = sample_nearest(sp, sw, sh, 1, ui+1, vi+1);
int ma = bilerp(a[0], b[0], c[0], d[0], uf, vf);
int masa = FZ_COMBINE(FZ_EXPAND(ma), sa);
for (k = 0; k < n1; k++)
dp[k] = FZ_BLEND(color[k], dp[k], masa);
dp[n1] = FZ_BLEND(255, dp[n1], masa);
if (hp)
hp[0] = FZ_BLEND(255, hp[0], masa);
}
dp += n;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static inline void
fz_paint_affine_color_N_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, byte *color, byte *hp)
{
int n1 = n-1;
int sa = color[n1];
int k;
while (w--)
{
int ui = u >> 16;
int vi = v >> 16;
if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
{
int ma = sp[vi * sw + ui];
int masa = FZ_COMBINE(FZ_EXPAND(ma), sa);
for (k = 0; k < n1; k++)
dp[k] = FZ_BLEND(color[k], dp[k], masa);
dp[n1] = FZ_BLEND(255, dp[n1], masa);
if (hp)
hp[n1] = FZ_BLEND(255, hp[n1], masa);
}
dp += n;
if (hp)
hp++;
u += fa;
v += fb;
}
}
static void
fz_paint_affine_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *color/*unused*/, byte *hp)
{
if (alpha == 255)
{
switch (n)
{
case 1: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 1, hp); break;
case 2: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 2, hp); break;
case 4: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 4, hp); break;
default: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, n, hp); break;
}
}
else if (alpha > 0)
{
switch (n)
{
case 1: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 1, alpha, hp); break;
case 2: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 2, alpha, hp); break;
case 4: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 4, alpha, hp); break;
default: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha, hp); break;
}
}
}
static void
fz_paint_affine_g2rgb_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *color/*unused*/, byte *hp)
{
if (alpha == 255)
{
fz_paint_affine_solid_g2rgb_lerp(dp, sp, sw, sh, u, v, fa, fb, w, hp);
}
else if (alpha > 0)
{
fz_paint_affine_alpha_g2rgb_lerp(dp, sp, sw, sh, u, v, fa, fb, w, alpha, hp);
}
}
static void
fz_paint_affine_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *color/*unused */, byte *hp)
{
if (alpha == 255)
{
switch (n)
{
case 1: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 1, hp); break;
case 2: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 2, hp); break;
case 4: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 4, hp); break;
default: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, n, hp); break;
}
}
else if (alpha > 0)
{
switch (n)
{
case 1: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 1, alpha, hp); break;
case 2: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 2, alpha, hp); break;
case 4: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 4, alpha, hp); break;
default: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha, hp); break;
}
}
}
static void
fz_paint_affine_g2rgb_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *color/*unused*/, byte *hp)
{
if (alpha == 255)
{
fz_paint_affine_solid_g2rgb_near(dp, sp, sw, sh, u, v, fa, fb, w, hp);
}
else if (alpha > 0)
{
fz_paint_affine_alpha_g2rgb_near(dp, sp, sw, sh, u, v, fa, fb, w, alpha, hp);
}
}
static void
fz_paint_affine_color_lerp(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha/*unused*/, byte *color, byte *hp)
{
switch (n)
{
case 2: fz_paint_affine_color_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 2, color, hp); break;
case 4: fz_paint_affine_color_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 4, color, hp); break;
default: fz_paint_affine_color_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, n, color, hp); break;
}
}
static void
fz_paint_affine_color_near(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha/*unused*/, byte *color, byte *hp)
{
switch (n)
{
case 2: fz_paint_affine_color_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 2, color, hp); break;
case 4: fz_paint_affine_color_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 4, color, hp); break;
default: fz_paint_affine_color_N_near(dp, sp, sw, sh, u, v, fa, fb, w, n, color, hp); break;
}
}
/* Draw an image with an affine transform on destination */
static void
fz_paint_image_imp(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *shape, fz_pixmap *img, fz_matrix ctm, byte *color, int alpha)
{
byte *dp, *sp, *hp;
int u, v, fa, fb, fc, fd;
int x, y, w, h;
int sw, sh, n, hw;
fz_matrix inv;
fz_bbox bbox;
int dolerp;
void (*paintfn)(byte *dp, byte *sp, int sw, int sh, int u, int v, int fa, int fb, int w, int n, int alpha, byte *color, byte *hp);
/* grid fit the image */
if (fz_is_rectilinear(ctm))
{
ctm.a = roundup(ctm.a);
ctm.b = roundup(ctm.b);
ctm.c = roundup(ctm.c);
ctm.d = roundup(ctm.d);
ctm.e = floorf(ctm.e);
ctm.f = floorf(ctm.f);
}
/* turn on interpolation for upscaled and non-rectilinear transforms */
dolerp = 0;
if (!fz_is_rectilinear(ctm))
dolerp = 1;
if (sqrtf(ctm.a * ctm.a + ctm.b * ctm.b) > img->w)
dolerp = 1;
if (sqrtf(ctm.c * ctm.c + ctm.d * ctm.d) > img->h)
dolerp = 1;
/* except when we shouldn't, at large magnifications */
if (!img->interpolate)
{
if (sqrtf(ctm.a * ctm.a + ctm.b * ctm.b) > img->w * 2)
dolerp = 0;
if (sqrtf(ctm.c * ctm.c + ctm.d * ctm.d) > img->h * 2)
dolerp = 0;
}
bbox = fz_round_rect(fz_transform_rect(ctm, fz_unit_rect));
bbox = fz_intersect_bbox(bbox, scissor);
x = bbox.x0;
y = bbox.y0;
w = bbox.x1 - bbox.x0;
h = bbox.y1 - bbox.y0;
/* map from screen space (x,y) to image space (u,v) */
inv = fz_scale(1.0f / img->w, -1.0f / img->h);
inv = fz_concat(inv, fz_translate(0, 1));
inv = fz_concat(inv, ctm);
inv = fz_invert_matrix(inv);
fa = inv.a * 65536;
fb = inv.b * 65536;
fc = inv.c * 65536;
fd = inv.d * 65536;
/* Calculate initial texture positions. Do a half step to start. */
u = (fa * x) + (fc * y) + inv.e * 65536 + ((fa + fc) >> 1);
v = (fb * x) + (fd * y) + inv.f * 65536 + ((fb + fd) >> 1);
dp = dst->samples + ((y - dst->y) * dst->w + (x - dst->x)) * dst->n;
n = dst->n;
sp = img->samples;
sw = img->w;
sh = img->h;
if (shape)
{
hw = shape->w;
hp = shape->samples + ((y - shape->y) * hw) + x - dst->x;
}
else
{
hw = 0;
hp = NULL;
}
/* TODO: if (fb == 0 && fa == 1) call fz_paint_span */
if (dst->n == 4 && img->n == 2)
{
assert(color == NULL);
if (dolerp)
paintfn = fz_paint_affine_g2rgb_lerp;
else
paintfn = fz_paint_affine_g2rgb_near;
}
else
{
if (dolerp)
{
if (color)
paintfn = fz_paint_affine_color_lerp;
else
paintfn = fz_paint_affine_lerp;
}
else
{
if (color)
paintfn = fz_paint_affine_color_near;
else
paintfn = fz_paint_affine_near;
}
}
while (h--)
{
paintfn(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha, color, hp);
dp += dst->w * n;
hp += hw;
u += fc;
v += fd;
}
}
void
fz_paint_image_with_color(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *shape, fz_pixmap *img, fz_matrix ctm, byte *color)
{
assert(img->n == 1);
fz_paint_image_imp(dst, scissor, shape, img, ctm, color, 255);
}
void
fz_paint_image(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *shape, fz_pixmap *img, fz_matrix ctm, int alpha)
{
assert(dst->n == img->n || (dst->n == 4 && img->n == 2));
fz_paint_image_imp(dst, scissor, shape, img, ctm, NULL, alpha);
}