forked from KolibriOS/kolibrios
589 lines
15 KiB
C
589 lines
15 KiB
C
#include "fitz.h"
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typedef unsigned char byte;
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static inline float roundup(float x)
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{
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return (x < 0) ? floorf(x) : ceilf(x);
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}
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static inline int lerp(int a, int b, int t)
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{
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return a + (((b - a) * t) >> 16);
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}
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static inline int bilerp(int a, int b, int c, int d, int u, int v)
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{
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return lerp(lerp(a, b, u), lerp(c, d, u), v);
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}
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static inline byte *sample_nearest(byte *s, int w, int h, int n, int u, int v)
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{
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if (u < 0) u = 0;
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if (v < 0) v = 0;
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if (u >= w) u = w - 1;
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if (v >= h) v = h - 1;
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return s + (v * w + u) * n;
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}
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/* Blend premultiplied source image in constant alpha over destination */
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static inline void
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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)
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{
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int k;
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int n1 = n-1;
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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int uf = u & 0xffff;
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int vf = v & 0xffff;
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byte *a = sample_nearest(sp, sw, sh, n, ui, vi);
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byte *b = sample_nearest(sp, sw, sh, n, ui+1, vi);
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byte *c = sample_nearest(sp, sw, sh, n, ui, vi+1);
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byte *d = sample_nearest(sp, sw, sh, n, ui+1, vi+1);
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int xa = bilerp(a[n1], b[n1], c[n1], d[n1], uf, vf);
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int t;
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xa = fz_mul255(xa, alpha);
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t = 255 - xa;
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for (k = 0; k < n1; k++)
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{
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int x = bilerp(a[k], b[k], c[k], d[k], uf, vf);
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dp[k] = fz_mul255(x, alpha) + fz_mul255(dp[k], t);
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}
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dp[n1] = xa + fz_mul255(dp[n1], t);
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if (hp)
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hp[0] = xa + fz_mul255(hp[n1], t);
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}
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dp += n;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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/* Special case code for gray -> rgb */
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static inline void
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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)
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{
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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int uf = u & 0xffff;
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int vf = v & 0xffff;
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byte *a = sample_nearest(sp, sw, sh, 2, ui, vi);
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byte *b = sample_nearest(sp, sw, sh, 2, ui+1, vi);
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byte *c = sample_nearest(sp, sw, sh, 2, ui, vi+1);
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byte *d = sample_nearest(sp, sw, sh, 2, ui+1, vi+1);
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int y = bilerp(a[1], b[1], c[1], d[1], uf, vf);
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int x = bilerp(a[0], b[0], c[0], d[0], uf, vf);
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int t;
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x = fz_mul255(x, alpha);
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y = fz_mul255(y, alpha);
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t = 255 - y;
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dp[0] = x + fz_mul255(dp[0], t);
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dp[1] = x + fz_mul255(dp[1], t);
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dp[2] = x + fz_mul255(dp[2], t);
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dp[3] = y + fz_mul255(dp[3], t);
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if (hp)
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hp[0] = y + fz_mul255(hp[0], t);
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}
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dp += 4;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static inline void
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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)
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{
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int k;
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int n1 = n-1;
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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byte *sample = sp + ((vi * sw + ui) * n);
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int a = fz_mul255(sample[n-1], alpha);
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int t = 255 - a;
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for (k = 0; k < n1; k++)
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dp[k] = fz_mul255(sample[k], alpha) + fz_mul255(dp[k], t);
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dp[n1] = a + fz_mul255(dp[n1], t);
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if (hp)
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hp[0] = a + fz_mul255(hp[n1], t);
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}
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dp += n;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static inline void
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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)
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{
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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byte *sample = sp + ((vi * sw + ui) * 2);
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int x = fz_mul255(sample[0], alpha);
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int a = fz_mul255(sample[1], alpha);
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int t = 255 - a;
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dp[0] = x + fz_mul255(dp[0], t);
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dp[1] = x + fz_mul255(dp[1], t);
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dp[2] = x + fz_mul255(dp[2], t);
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dp[3] = a + fz_mul255(dp[3], t);
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if (hp)
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hp[0] = a + fz_mul255(hp[0], t);
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}
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dp += 4;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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/* Blend premultiplied source image over destination */
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static inline void
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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)
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{
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int k;
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int n1 = n-1;
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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int uf = u & 0xffff;
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int vf = v & 0xffff;
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byte *a = sample_nearest(sp, sw, sh, n, ui, vi);
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byte *b = sample_nearest(sp, sw, sh, n, ui+1, vi);
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byte *c = sample_nearest(sp, sw, sh, n, ui, vi+1);
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byte *d = sample_nearest(sp, sw, sh, n, ui+1, vi+1);
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int y = bilerp(a[n1], b[n1], c[n1], d[n1], uf, vf);
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int t = 255 - y;
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for (k = 0; k < n1; k++)
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{
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int x = bilerp(a[k], b[k], c[k], d[k], uf, vf);
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dp[k] = x + fz_mul255(dp[k], t);
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}
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dp[n1] = y + fz_mul255(dp[n1], t);
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if (hp)
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hp[0] = y + fz_mul255(hp[0], t);
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}
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dp += n;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static inline void
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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)
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{
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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int uf = u & 0xffff;
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int vf = v & 0xffff;
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byte *a = sample_nearest(sp, sw, sh, 2, ui, vi);
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byte *b = sample_nearest(sp, sw, sh, 2, ui+1, vi);
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byte *c = sample_nearest(sp, sw, sh, 2, ui, vi+1);
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byte *d = sample_nearest(sp, sw, sh, 2, ui+1, vi+1);
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int y = bilerp(a[1], b[1], c[1], d[1], uf, vf);
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int t = 255 - y;
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int x = bilerp(a[0], b[0], c[0], d[0], uf, vf);
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dp[0] = x + fz_mul255(dp[0], t);
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dp[1] = x + fz_mul255(dp[1], t);
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dp[2] = x + fz_mul255(dp[2], t);
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dp[3] = y + fz_mul255(dp[3], t);
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if (hp)
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hp[0] = y + fz_mul255(hp[0], t);
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}
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dp += 4;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static inline void
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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)
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{
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int k;
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int n1 = n-1;
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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byte *sample = sp + ((vi * sw + ui) * n);
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int a = sample[n1];
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int t = 255 - a;
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for (k = 0; k < n1; k++)
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dp[k] = sample[k] + fz_mul255(dp[k], t);
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dp[n1] = a + fz_mul255(dp[n1], t);
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if (hp)
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hp[0] = a + fz_mul255(hp[0], t);
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}
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dp += n;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static inline void
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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)
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{
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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byte *sample = sp + ((vi * sw + ui) * 2);
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int x = sample[0];
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int a = sample[1];
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int t = 255 - a;
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dp[0] = x + fz_mul255(dp[0], t);
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dp[1] = x + fz_mul255(dp[1], t);
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dp[2] = x + fz_mul255(dp[2], t);
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dp[3] = a + fz_mul255(dp[3], t);
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if (hp)
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hp[0] = a + fz_mul255(hp[0], t);
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}
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dp += 4;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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/* Blend non-premultiplied color in source image mask over destination */
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static inline void
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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)
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{
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int n1 = n - 1;
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int sa = color[n1];
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int k;
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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int uf = u & 0xffff;
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int vf = v & 0xffff;
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byte *a = sample_nearest(sp, sw, sh, 1, ui, vi);
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byte *b = sample_nearest(sp, sw, sh, 1, ui+1, vi);
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byte *c = sample_nearest(sp, sw, sh, 1, ui, vi+1);
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byte *d = sample_nearest(sp, sw, sh, 1, ui+1, vi+1);
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int ma = bilerp(a[0], b[0], c[0], d[0], uf, vf);
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int masa = FZ_COMBINE(FZ_EXPAND(ma), sa);
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for (k = 0; k < n1; k++)
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dp[k] = FZ_BLEND(color[k], dp[k], masa);
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dp[n1] = FZ_BLEND(255, dp[n1], masa);
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if (hp)
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hp[0] = FZ_BLEND(255, hp[0], masa);
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}
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dp += n;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static inline void
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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)
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{
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int n1 = n-1;
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int sa = color[n1];
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int k;
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while (w--)
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{
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int ui = u >> 16;
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int vi = v >> 16;
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if (ui >= 0 && ui < sw && vi >= 0 && vi < sh)
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{
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int ma = sp[vi * sw + ui];
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int masa = FZ_COMBINE(FZ_EXPAND(ma), sa);
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for (k = 0; k < n1; k++)
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dp[k] = FZ_BLEND(color[k], dp[k], masa);
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dp[n1] = FZ_BLEND(255, dp[n1], masa);
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if (hp)
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hp[n1] = FZ_BLEND(255, hp[n1], masa);
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}
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dp += n;
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if (hp)
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hp++;
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u += fa;
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v += fb;
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}
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}
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static void
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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)
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{
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if (alpha == 255)
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{
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switch (n)
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{
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case 1: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 1, hp); break;
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case 2: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 2, hp); break;
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case 4: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 4, hp); break;
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default: fz_paint_affine_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, n, hp); break;
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}
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}
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else if (alpha > 0)
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{
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switch (n)
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{
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case 1: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 1, alpha, hp); break;
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case 2: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 2, alpha, hp); break;
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case 4: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 4, alpha, hp); break;
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default: fz_paint_affine_alpha_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha, hp); break;
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}
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}
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}
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static void
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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)
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{
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if (alpha == 255)
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{
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fz_paint_affine_solid_g2rgb_lerp(dp, sp, sw, sh, u, v, fa, fb, w, hp);
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}
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else if (alpha > 0)
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{
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fz_paint_affine_alpha_g2rgb_lerp(dp, sp, sw, sh, u, v, fa, fb, w, alpha, hp);
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}
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}
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static void
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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)
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{
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if (alpha == 255)
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{
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switch (n)
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{
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case 1: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 1, hp); break;
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case 2: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 2, hp); break;
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case 4: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 4, hp); break;
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default: fz_paint_affine_N_near(dp, sp, sw, sh, u, v, fa, fb, w, n, hp); break;
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}
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}
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else if (alpha > 0)
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{
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switch (n)
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{
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case 1: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 1, alpha, hp); break;
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case 2: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 2, alpha, hp); break;
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case 4: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 4, alpha, hp); break;
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default: fz_paint_affine_alpha_N_near(dp, sp, sw, sh, u, v, fa, fb, w, n, alpha, hp); break;
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}
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}
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}
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static void
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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)
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{
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if (alpha == 255)
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{
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fz_paint_affine_solid_g2rgb_near(dp, sp, sw, sh, u, v, fa, fb, w, hp);
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}
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else if (alpha > 0)
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{
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fz_paint_affine_alpha_g2rgb_near(dp, sp, sw, sh, u, v, fa, fb, w, alpha, hp);
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}
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}
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static void
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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)
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{
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switch (n)
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{
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case 2: fz_paint_affine_color_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 2, color, hp); break;
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case 4: fz_paint_affine_color_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, 4, color, hp); break;
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default: fz_paint_affine_color_N_lerp(dp, sp, sw, sh, u, v, fa, fb, w, n, color, hp); break;
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}
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}
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|
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static void
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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)
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|
{
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|
switch (n)
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|
{
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case 2: fz_paint_affine_color_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 2, color, hp); break;
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case 4: fz_paint_affine_color_N_near(dp, sp, sw, sh, u, v, fa, fb, w, 4, color, hp); break;
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default: fz_paint_affine_color_N_near(dp, sp, sw, sh, u, v, fa, fb, w, n, color, hp); break;
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}
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}
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|
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/* Draw an image with an affine transform on destination */
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|
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static void
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fz_paint_image_imp(fz_pixmap *dst, fz_bbox scissor, fz_pixmap *shape, fz_pixmap *img, fz_matrix ctm, byte *color, int alpha)
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|
{
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|
byte *dp, *sp, *hp;
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|
int u, v, fa, fb, fc, fd;
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|
int x, y, w, h;
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|
int sw, sh, n, hw;
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|
fz_matrix inv;
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|
fz_bbox bbox;
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|
int dolerp;
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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);
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|
|
|
/* grid fit the image */
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|
if (fz_is_rectilinear(ctm))
|
|
{
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|
ctm.a = roundup(ctm.a);
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|
ctm.b = roundup(ctm.b);
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|
ctm.c = roundup(ctm.c);
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|
ctm.d = roundup(ctm.d);
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|
ctm.e = floorf(ctm.e);
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|
ctm.f = floorf(ctm.f);
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|
}
|
|
|
|
/* turn on interpolation for upscaled and non-rectilinear transforms */
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|
dolerp = 0;
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|
if (!fz_is_rectilinear(ctm))
|
|
dolerp = 1;
|
|
if (sqrtf(ctm.a * ctm.a + ctm.b * ctm.b) > img->w)
|
|
dolerp = 1;
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|
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);
|
|
}
|