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Diffstat (limited to 'draw/imagedraw.c')
-rw-r--r--draw/imagedraw.c350
1 files changed, 180 insertions, 170 deletions
diff --git a/draw/imagedraw.c b/draw/imagedraw.c
index c43f9f24..8988a05f 100644
--- a/draw/imagedraw.c
+++ b/draw/imagedraw.c
@@ -1,7 +1,11 @@
#include "fitz.h"
+#define noNEAREST
+
typedef unsigned char byte;
+/* Sample image and clamp to edge */
+
static inline byte
getmask(byte *s, int w, int h, int u, int v)
{
@@ -13,23 +17,23 @@ getmask(byte *s, int w, int h, int u, int v)
}
static inline byte *
-getrgba(byte *s, int w, int h, int u, int v)
+getga(byte *s, int w, int h, 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 + ((w * v + u) << 2);
+ return s + ((w * v + u) << 1);
}
static inline byte *
-getga(byte *s, int w, int h, int u, int v)
+getrgba(byte *s, int w, int h, 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 + ((w * v + u) << 1);
+ return s + ((w * v + u) << 2);
}
static inline int
@@ -42,6 +46,8 @@ getcolor(byte *s, int w, int h, int n, int u, int v, int k)
return s[w * v * n + u + k];
}
+/* Bi-linear interpolation of sample */
+
static inline int
lerp(int a, int b, int t)
{
@@ -67,6 +73,9 @@ lerprgba(byte *dst, byte *a, byte *b, int t)
static inline int
samplemask(byte *s, int w, int h, int u, int v)
{
+#ifdef NEAREST
+ return getmask(s, w, h, u >> 16, v >> 16);
+#else
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFFFF;
@@ -78,13 +87,20 @@ samplemask(byte *s, int w, int h, int u, int v)
int ab = lerp(a, b, ud);
int cd = lerp(c, d, ud);
return lerp(ab, cd, vd);
+#endif
}
static inline void
-samplega(byte *s, int w, int h, int u, int v, byte *out)
+samplega(byte *s, int w, int h, int u, int v, int *gout, int *aout)
{
+#ifdef NEAREST
+ byte *ga = getga(s, w, h, u >> 16, v >> 16);
+ *gout = ga[0];
+ *aout = ga[1];
+#else
byte ab[2];
byte cd[2];
+ byte abcd[2];
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFFFF;
@@ -95,14 +111,25 @@ samplega(byte *s, int w, int h, int u, int v, byte *out)
byte *d = getga(s, w, h, ui+1, vi+1);
lerpga(ab, a, b, ud);
lerpga(cd, c, d, ud);
- lerpga(out, ab, cd, vd);
+ lerpga(abcd, ab, cd, vd);
+ *gout = abcd[0];
+ *aout = abcd[0];
+#endif
}
static inline void
-samplergba(byte *s, int w, int h, int u, int v, byte *out)
+samplergba(byte *s, int w, int h, int u, int v, int *rout, int *gout, int *bout, int *aout)
{
+#ifdef NEAREST
+ byte *rgba = getrgba(s, w, h, u >> 16, v >> 16);
+ *rout = rgba[0];
+ *gout = rgba[1];
+ *bout = rgba[2];
+ *aout = rgba[3];
+#else
byte ab[4];
byte cd[4];
+ byte abcd[4];
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFFFF;
@@ -113,12 +140,22 @@ samplergba(byte *s, int w, int h, int u, int v, byte *out)
byte *d = getrgba(s, w, h, ui+1, vi+1);
lerprgba(ab, a, b, ud);
lerprgba(cd, c, d, ud);
- lerprgba(out, ab, cd, vd);
+ lerprgba(abcd, ab, cd, vd);
+ *rout = abcd[0];
+ *gout = abcd[1];
+ *bout = abcd[2];
+ *aout = abcd[3];
+#endif
}
static inline void
samplecolor(byte *s, int w, int h, int n, int u, int v, byte *out)
{
+#ifdef NEAREST
+ int k;
+ for (k = 0; k < n; k++)
+ out[k] = getcolor(s, w, h, n, u >> 16, v >> 16, k);
+#else
int ui = u >> 16;
int vi = v >> 16;
int ud = u & 0xFFFF;
@@ -134,217 +171,190 @@ samplecolor(byte *s, int w, int h, int n, int u, int v, byte *out)
int cd = lerp(c, d, ud);
out[k] = lerp(ab, cd, vd);
}
+#endif
}
-static void
-img_1o1(byte * restrict src, byte cov, int len, byte * restrict dst,
- fz_pixmap *image, int u, int v, int fa, int fb)
-{
- byte *samples = image->samples;
- int w = image->w;
- int h = image->h;
+/* Blend source image scanline over destination */
- while (len--)
+static inline void
+fz_blendscan1(unsigned char *dp, unsigned char *sp, int sw, int sh,
+ int u, int v, int fa, int fb, int w)
+{
+ while (w--)
{
- int sa;
- cov += *src; *src = 0; src++;
- if (cov != 0)
+ if (u >= 0 && u < sw << 16 && v >= 0 && v < sh << 16)
{
- sa = samplemask(samples, w, h, u, v);
- sa = FZ_COMBINE(FZ_EXPAND(sa), FZ_EXPAND(cov));
- if (sa != 0)
- {
- dst[0] = FZ_BLEND(255, dst[0], sa);
- }
+ int a = samplemask(sp, sw, sh, u, v);
+ dp[0] = a + fz_mul255(dp[0], 255 - a);
}
- dst++;
+ dp ++;
u += fa;
v += fb;
}
}
-static void
-img_2o2(byte * restrict src, byte cov, int len, byte * restrict dst,
- fz_pixmap *image, int u, int v, int fa, int fb)
+static inline void
+fz_blendscan2(unsigned char *dp, unsigned char *sp, int sw, int sh,
+ int u, int v, int fa, int fb, int w)
{
- byte *samples = image->samples;
- int w = image->w;
- int h = image->h;
- byte ga[2];
-
- while (len--)
+ while (w--)
{
- int sa;
- cov += *src; *src = 0; src++;
- if (cov != 0)
+ if (u >= 0 && u < sw << 16 && v >= 0 && v < sh << 16)
{
- samplega(samples, w, h, u, v, ga);
- sa = FZ_COMBINE(FZ_EXPAND(ga[1]), FZ_EXPAND(cov));
- if (sa != 0)
- {
- dst[0] = FZ_BLEND(ga[0], dst[0], sa);
- dst[1] = FZ_BLEND(255, dst[1], sa);
- }
+ int g, a, t;
+ samplega(sp, sw, sh, u, v, &g, &a);
+ t = 255 - a;
+ dp[0] = g + fz_mul255(dp[0], t);
+ dp[1] = a + fz_mul255(dp[1], t);
}
- dst += 2;
+ dp += 2;
u += fa;
v += fb;
}
}
-static void
-img_4o4(byte * restrict src, byte cov, int len, byte * restrict dst,
- fz_pixmap *image, int u, int v, int fa, int fb)
+static inline void
+fz_blendscan4(unsigned char *dp, unsigned char *sp, int sw, int sh,
+ int u, int v, int fa, int fb, int w)
{
- byte *samples = image->samples;
- int w = image->w;
- int h = image->h;
- byte rgba[4];
-
- while (len--)
+ while (w--)
{
- int sa;
- cov += *src; *src = 0; src++;
- if (cov != 0)
+ if (u >= 0 && u < sw << 16 && v >= 0 && v < sh << 16)
{
- samplergba(samples, w, h, u, v, rgba);
- sa = FZ_COMBINE(FZ_EXPAND(rgba[3]), FZ_EXPAND(cov));
- if (sa != 0)
- {
- dst[0] = FZ_BLEND(rgba[0], dst[0], sa);
- dst[1] = FZ_BLEND(rgba[1], dst[1], sa);
- dst[2] = FZ_BLEND(rgba[2], dst[2], sa);
- dst[3] = FZ_BLEND(255, dst[3], sa);
- }
+ int r, g, b, a, t;
+ samplergba(sp, sw, sh, u, v, &r, &g, &b, &a);
+ t = 255 - a;
+ dp[0] = r + fz_mul255(dp[0], t);
+ dp[1] = g + fz_mul255(dp[1], t);
+ dp[2] = b + fz_mul255(dp[2], t);
+ dp[3] = a + fz_mul255(dp[3], t);
}
- dst += 4;
+ dp += 4;
u += fa;
v += fb;
}
}
-static void
-img_w2i1o2(byte *ga, byte * restrict src, byte cov, int len, byte * restrict dst,
- fz_pixmap *image, int u, int v, int fa, int fb)
+static inline void
+fz_blendscan(unsigned char *dp, unsigned char *sp, int sw, int sh,
+ int u, int v, int fa, int fb, int w, int n)
{
- byte *samples = image->samples;
- int w = image->w;
- int h = image->h;
- byte g = ga[0];
- byte a = ga[1];
-
- if (a == 0)
- return;
- if (a != 255)
+ while (w--)
{
- while (len--)
+ if (u >= 0 && u < sw << 16 && v >= 0 && v < sh << 16)
{
- int ca;
- cov += *src; *src = 0; src++;
- if (cov != 0)
- {
- ca = samplemask(samples, w, h, u, v);
- ca = FZ_COMBINE(FZ_EXPAND(cov), FZ_EXPAND(ca));
- ca = FZ_COMBINE(ca, FZ_EXPAND(a));
- if (ca != 0)
- {
- dst[0] = FZ_BLEND(g, dst[0], ca);
- dst[1] = FZ_BLEND(255, dst[1], ca);
- }
- }
- dst += 2;
- u += fa;
- v += fb;
+ unsigned char color[FZ_MAXCOLORS+1];
+ int k, t;
+ samplecolor(sp, sw, sh, n, u, v, color);
+ t = 255 - color[n-1];
+ for (k = 0; k < n; k++)
+ dp[k] = color[k] + fz_mul255(dp[k], t);
}
+ dp += n;
+ u += fa;
+ v += fb;
}
- else
+}
+
+/* Blend non-premultiplied color in image mask over destination */
+
+static inline void
+fz_blendscanwithcolor(unsigned char *dp, unsigned char *sp, int sw, int sh,
+ int u, int v, int fa, int fb, int w, int n, unsigned char *color)
+{
+ int sa = color[n-1];
+ while (w--)
{
- while (len--)
+ if (u >= 0 && u < sw << 16 && v >= 0 && v < sh << 16)
{
- int ca;
- cov += *src; *src = 0; src++;
- if (cov != 0)
- {
- ca = samplemask(samples, w, h, u, v);
- ca = FZ_COMBINE(FZ_EXPAND(cov), FZ_EXPAND(ca));
- if (ca != 0)
- {
- dst[0] = FZ_BLEND(g, dst[0], ca);
- dst[1] = FZ_BLEND(255, dst[1], ca);
- }
- }
- dst += 2;
- u += fa;
- v += fb;
+ int ma = samplemask(sp, sw, sh, u, v);
+ int masa = fz_mul255(sa, ma);
+ int t = 255 - masa;
+ int k;
+ for (k = 0; k < n; k++)
+ dp[k] = fz_mul255(color[k], ma) + fz_mul255(dp[k], t);
}
+ dp += n;
+ u += fa;
+ v += fb;
}
}
+/* Draw an image with an affine transform on destination */
+
static void
-img_w4i1o4(byte *rgba, byte * restrict src, byte cov, int len, byte * restrict dst,
- fz_pixmap *image, int u, int v, int fa, int fb)
+fz_blendimageimp(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *img, fz_matrix ctm,
+ unsigned char *color)
{
- byte *samples = image->samples;
- int w = image->w;
- int h = image->h;
- byte r = rgba[0];
- byte g = rgba[1];
- byte b = rgba[2];
- byte a = rgba[3];
-
- if (a == 0)
- return;
- if (a != 255)
+ unsigned char *dp, *sp;
+ int u, v, fa, fb, fc, fd;
+ int x, y, w, h;
+ int sw, sh, n;
+ fz_matrix inv;
+ fz_bbox bbox;
+
+ /* 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_invertmatrix(inv);
+ inv.e -= 0.5f;
+ inv.f -= 0.5f;
+
+ fa = inv.a * 65536;
+ fb = inv.b * 65536;
+ fc = inv.c * 65536;
+ fd = inv.d * 65536;
+
+ bbox = fz_roundrect(fz_transformrect(ctm, fz_unitrect));
+ bbox = fz_intersectbbox(bbox, scissor);
+ x = bbox.x0;
+ y = bbox.y0;
+ w = bbox.x1 - bbox.x0;
+ h = bbox.y1 - bbox.y0;
+
+ dp = dst->samples + ((bbox.y0 - dst->y) * dst->w + (bbox.x0 - dst->x)) * dst->n;
+ n = dst->n;
+ sp = img->samples;
+ sw = img->w;
+ sh = img->h;
+
+ u = (inv.a * (x+0.5) + inv.c * (y+0.5) + inv.e) * 65536;
+ v = (inv.b * (x+0.5) + inv.d * (y+0.5) + inv.f) * 65536;
+
+ while (h--)
{
- while (len--)
+ if (color)
{
- int ca;
- cov += *src; *src = 0; src++;
- if (cov != 0)
- {
- ca = samplemask(samples, w, h, u, v);
- ca = FZ_COMBINE(FZ_EXPAND(cov), FZ_EXPAND(ca));
- ca = FZ_COMBINE(ca, FZ_EXPAND(a));
- if (ca != 0)
- {
- dst[0] = FZ_BLEND(r, dst[0], ca);
- dst[1] = FZ_BLEND(g, dst[1], ca);
- dst[2] = FZ_BLEND(b, dst[2], ca);
- dst[3] = FZ_BLEND(255, dst[3], ca);
- }
- }
- dst += 4;
- u += fa;
- v += fb;
+ fz_blendscanwithcolor(dp, sp, sw, sh, u, v, fa, fb, w, n, color);
}
- }
- else
- {
- while (len--)
+ else
{
- int ca;
- cov += *src; *src = 0; src++;
- if (cov != 0)
+ switch (n)
{
- ca = samplemask(samples, w, h, u, v);
- ca = FZ_COMBINE(FZ_EXPAND(cov), FZ_EXPAND(ca));
- if (ca != 0)
- {
- dst[0] = FZ_BLEND(r, dst[0], ca);
- dst[1] = FZ_BLEND(g, dst[1], ca);
- dst[2] = FZ_BLEND(b, dst[2], ca);
- dst[3] = FZ_BLEND(255, dst[3], ca);
- }
+ case 1: fz_blendscan1(dp, sp, sw, sh, u, v, fa, fb, w); break;
+ case 2: fz_blendscan2(dp, sp, sw, sh, u, v, fa, fb, w); break;
+ case 4: fz_blendscan4(dp, sp, sw, sh, u, v, fa, fb, w); break;
+ default: fz_blendscan(dp, sp, sw, sh, u, v, fa, fb, w, n); break;
}
- dst += 4;
- u += fa;
- v += fb;
}
+ dp += dst->w * n;
+ u += fc;
+ v += fd;
}
}
-void (*fz_img_1o1)(byte*restrict, byte, int, byte*restrict, fz_pixmap *image, int u, int v, int fa, int fb) = img_1o1;
-void (*fz_img_2o2)(byte*restrict, byte, int, byte*restrict, fz_pixmap *image, int u, int v, int fa, int fb) = img_2o2;
-void (*fz_img_4o4)(byte*restrict, byte, int, byte*restrict, fz_pixmap *image, int u, int v, int fa, int fb) = img_4o4;
-void (*fz_img_w2i1o2)(byte*, byte*restrict, byte, int, byte*restrict, fz_pixmap *image, int u, int v, int fa, int fb) = img_w2i1o2;
-void (*fz_img_w4i1o4)(byte*, byte*restrict, byte, int, byte*restrict, fz_pixmap *image, int u, int v, int fa, int fb) = img_w4i1o4;
+void
+fz_blendimagewithcolor(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *img, fz_matrix ctm,
+ unsigned char *color)
+{
+ assert(img->n == 1);
+ fz_blendimageimp(dst, scissor, img, ctm, color);
+}
+
+void
+fz_blendimage(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *img, fz_matrix ctm)
+{
+ assert(dst->n == img->n);
+ fz_blendimageimp(dst, scissor, img, ctm, nil);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-07-14 15:34:04 +0000