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568 lines
13 KiB
C
568 lines
13 KiB
C
#include "fitz.h"
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/* PDF 1.4 blend modes. These are slow. */
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typedef unsigned char byte;
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static const char *fz_blendmode_names[] =
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{
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"Normal",
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"Multiply",
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"Screen",
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"Overlay",
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"Darken",
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"Lighten",
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"ColorDodge",
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"ColorBurn",
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"HardLight",
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"SoftLight",
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"Difference",
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"Exclusion",
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"Hue",
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"Saturation",
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"Color",
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"Luminosity",
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};
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int fz_find_blendmode(char *name)
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{
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int i;
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for (i = 0; i < nelem(fz_blendmode_names); i++)
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if (!strcmp(name, fz_blendmode_names[i]))
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return i;
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return FZ_BLEND_NORMAL;
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}
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char *fz_blendmode_name(int blendmode)
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{
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if (blendmode >= 0 && blendmode < nelem(fz_blendmode_names))
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return (char*)fz_blendmode_names[blendmode];
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return "Normal";
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}
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/* Separable blend modes */
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static inline int fz_screen_byte(int b, int s)
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{
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return b + s - fz_mul255(b, s);
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}
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static inline int fz_hard_light_byte(int b, int s)
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{
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int s2 = s << 1;
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if (s <= 127)
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return fz_mul255(b, s2);
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else
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return fz_screen_byte(b, s2 - 255);
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}
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static inline int fz_overlay_byte(int b, int s)
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{
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return fz_hard_light_byte(s, b); /* note swapped order */
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}
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static inline int fz_darken_byte(int b, int s)
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{
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return MIN(b, s);
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}
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static inline int fz_lighten_byte(int b, int s)
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{
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return MAX(b, s);
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}
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static inline int fz_color_dodge_byte(int b, int s)
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{
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s = 255 - s;
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if (b == 0)
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return 0;
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else if (b >= s)
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return 255;
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else
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return (0x1fe * b + s) / (s << 1);
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}
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static inline int fz_color_burn_byte(int b, int s)
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{
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b = 255 - b;
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if (b == 0)
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return 255;
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else if (b >= s)
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return 0;
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else
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return 0xff - (0x1fe * b + s) / (s << 1);
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}
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static inline int fz_soft_light_byte(int b, int s)
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{
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/* review this */
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if (s < 128) {
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return b - fz_mul255(fz_mul255((255 - (s<<1)), b), 255 - b);
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}
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else {
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int dbd;
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if (b < 64)
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dbd = fz_mul255(fz_mul255((b << 4) - 12, b) + 4, b);
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else
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dbd = (int)sqrtf(255.0f * b);
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return b + fz_mul255(((s<<1) - 255), (dbd - b));
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}
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}
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static inline int fz_difference_byte(int b, int s)
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{
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return ABS(b - s);
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}
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static inline int fz_exclusion_byte(int b, int s)
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{
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return b + s - (fz_mul255(b, s)<<1);
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}
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/* Non-separable blend modes */
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static void
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fz_luminosity_rgb(int *rd, int *gd, int *bd, int rb, int gb, int bb, int rs, int gs, int bs)
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{
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int delta, scale;
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int r, g, b, y;
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/* 0.3, 0.59, 0.11 in fixed point */
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delta = ((rs - rb) * 77 + (gs - gb) * 151 + (bs - bb) * 28 + 0x80) >> 8;
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r = rb + delta;
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g = gb + delta;
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b = bb + delta;
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if ((r | g | b) & 0x100)
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{
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y = (rs * 77 + gs * 151 + bs * 28 + 0x80) >> 8;
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if (delta > 0)
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{
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int max;
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max = MAX(r, MAX(g, b));
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scale = ((255 - y) << 16) / (max - y);
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}
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else
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{
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int min;
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min = MIN(r, MIN(g, b));
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scale = (y << 16) / (y - min);
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}
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r = y + (((r - y) * scale + 0x8000) >> 16);
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g = y + (((g - y) * scale + 0x8000) >> 16);
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b = y + (((b - y) * scale + 0x8000) >> 16);
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}
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*rd = r;
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*gd = g;
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*bd = b;
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}
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static void
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fz_saturation_rgb(int *rd, int *gd, int *bd, int rb, int gb, int bb, int rs, int gs, int bs)
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{
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int minb, maxb;
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int mins, maxs;
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int y;
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int scale;
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int r, g, b;
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minb = MIN(rb, MIN(gb, bb));
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maxb = MAX(rb, MAX(gb, bb));
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if (minb == maxb)
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{
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/* backdrop has zero saturation, avoid divide by 0 */
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*rd = gb;
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*gd = gb;
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*bd = gb;
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return;
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}
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mins = MIN(rs, MIN(gs, bs));
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maxs = MAX(rs, MAX(gs, bs));
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scale = ((maxs - mins) << 16) / (maxb - minb);
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y = (rb * 77 + gb * 151 + bb * 28 + 0x80) >> 8;
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r = y + ((((rb - y) * scale) + 0x8000) >> 16);
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g = y + ((((gb - y) * scale) + 0x8000) >> 16);
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b = y + ((((bb - y) * scale) + 0x8000) >> 16);
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if ((r | g | b) & 0x100)
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{
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int scalemin, scalemax;
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int min, max;
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min = MIN(r, MIN(g, b));
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max = MAX(r, MAX(g, b));
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if (min < 0)
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scalemin = (y << 16) / (y - min);
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else
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scalemin = 0x10000;
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if (max > 255)
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scalemax = ((255 - y) << 16) / (max - y);
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else
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scalemax = 0x10000;
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scale = MIN(scalemin, scalemax);
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r = y + (((r - y) * scale + 0x8000) >> 16);
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g = y + (((g - y) * scale + 0x8000) >> 16);
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b = y + (((b - y) * scale + 0x8000) >> 16);
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}
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*rd = r;
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*gd = g;
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*bd = b;
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}
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static void
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fz_color_rgb(int *rr, int *rg, int *rb, int br, int bg, int bb, int sr, int sg, int sb)
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{
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fz_luminosity_rgb(rr, rg, rb, sr, sg, sb, br, bg, bb);
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}
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static void
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fz_hue_rgb(int *rr, int *rg, int *rb, int br, int bg, int bb, int sr, int sg, int sb)
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{
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int tr, tg, tb;
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fz_luminosity_rgb(&tr, &tg, &tb, sr, sg, sb, br, bg, bb);
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fz_saturation_rgb(rr, rg, rb, tr, tg, tb, br, bg, bb);
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}
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/* Blending loops */
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void
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fz_blend_separable(byte * restrict bp, byte * restrict sp, int n, int w, int blendmode)
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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 sa = sp[n1];
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int ba = bp[n1];
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int saba = fz_mul255(sa, ba);
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/* ugh, division to get non-premul components */
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int invsa = sa ? 255 * 256 / sa : 0;
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int invba = ba ? 255 * 256 / ba : 0;
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for (k = 0; k < n1; k++)
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{
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int sc = (sp[k] * invsa) >> 8;
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int bc = (bp[k] * invba) >> 8;
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int rc;
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switch (blendmode)
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{
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default:
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case FZ_BLEND_NORMAL: rc = sc; break;
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case FZ_BLEND_MULTIPLY: rc = fz_mul255(bc, sc); break;
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case FZ_BLEND_SCREEN: rc = fz_screen_byte(bc, sc); break;
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case FZ_BLEND_OVERLAY: rc = fz_overlay_byte(bc, sc); break;
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case FZ_BLEND_DARKEN: rc = fz_darken_byte(bc, sc); break;
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case FZ_BLEND_LIGHTEN: rc = fz_lighten_byte(bc, sc); break;
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case FZ_BLEND_COLOR_DODGE: rc = fz_color_dodge_byte(bc, sc); break;
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case FZ_BLEND_COLOR_BURN: rc = fz_color_burn_byte(bc, sc); break;
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case FZ_BLEND_HARD_LIGHT: rc = fz_hard_light_byte(bc, sc); break;
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case FZ_BLEND_SOFT_LIGHT: rc = fz_soft_light_byte(bc, sc); break;
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case FZ_BLEND_DIFFERENCE: rc = fz_difference_byte(bc, sc); break;
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case FZ_BLEND_EXCLUSION: rc = fz_exclusion_byte(bc, sc); break;
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}
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bp[k] = fz_mul255(255 - sa, bp[k]) + fz_mul255(255 - ba, sp[k]) + fz_mul255(saba, rc);
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}
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bp[k] = ba + sa - saba;
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sp += n;
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bp += n;
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}
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}
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void
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fz_blend_nonseparable(byte * restrict bp, byte * restrict sp, int w, int blendmode)
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{
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while (w--)
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{
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int rr, rg, rb;
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int sa = sp[3];
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int ba = bp[3];
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int saba = fz_mul255(sa, ba);
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/* ugh, division to get non-premul components */
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int invsa = sa ? 255 * 256 / sa : 0;
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int invba = ba ? 255 * 256 / ba : 0;
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int sr = (sp[0] * invsa) >> 8;
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int sg = (sp[1] * invsa) >> 8;
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int sb = (sp[2] * invsa) >> 8;
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int br = (bp[0] * invba) >> 8;
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int bg = (bp[1] * invba) >> 8;
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int bb = (bp[2] * invba) >> 8;
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switch (blendmode)
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{
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default:
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case FZ_BLEND_HUE:
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fz_hue_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
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case FZ_BLEND_SATURATION:
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fz_saturation_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
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case FZ_BLEND_COLOR:
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fz_color_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
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case FZ_BLEND_LUMINOSITY:
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fz_luminosity_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
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}
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bp[0] = fz_mul255(255 - sa, bp[0]) + fz_mul255(255 - ba, sp[0]) + fz_mul255(saba, rr);
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bp[1] = fz_mul255(255 - sa, bp[1]) + fz_mul255(255 - ba, sp[1]) + fz_mul255(saba, rg);
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bp[2] = fz_mul255(255 - sa, bp[2]) + fz_mul255(255 - ba, sp[2]) + fz_mul255(saba, rb);
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bp[3] = ba + sa - saba;
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sp += 4;
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bp += 4;
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}
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}
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static void
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fz_blend_separable_nonisolated(byte * restrict bp, byte * restrict sp, int n, int w, int blendmode, byte * restrict hp, int alpha)
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{
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int k;
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int n1 = n - 1;
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if (alpha == 255 && blendmode == 0)
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{
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/* In this case, the uncompositing and the recompositing
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* cancel one another out, and it's just a simple copy. */
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/* FIXME: Maybe we can avoid using the shape plane entirely
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* and just copy? */
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while (w--)
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{
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int ha = fz_mul255(*hp++, alpha); /* ha = shape_alpha */
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/* If ha == 0 then leave everything unchanged */
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if (ha != 0)
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{
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for (k = 0; k < n; k++)
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{
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bp[k] = sp[k];
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}
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}
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sp += n;
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bp += n;
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}
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return;
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}
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while (w--)
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{
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int ha = *hp++;
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int haa = fz_mul255(ha, alpha); /* ha = shape_alpha */
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/* If haa == 0 then leave everything unchanged */
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if (haa != 0)
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{
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int sa = sp[n1];
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int ba = bp[n1];
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int baha = fz_mul255(ba, haa);
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/* ugh, division to get non-premul components */
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int invsa = sa ? 255 * 256 / sa : 0;
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int invba = ba ? 255 * 256 / ba : 0;
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/* Calculate result_alpha */
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int ra = bp[n1] = ba - baha + haa;
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/* Because we are a non-isolated group, we need to
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* 'uncomposite' before we blend (recomposite).
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* We assume that normal blending has been done inside
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* the group, so: ra.rc = (1-ha).bc + ha.sc
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* A bit of rearrangement, and that gives us that:
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* sc = (ra.rc - bc)/ha + bc
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* Now, the result of the blend was stored in src, so:
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*/
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int invha = ha ? 255 * 256 / ha : 0;
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if (ra != 0) for (k = 0; k < n1; k++)
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{
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int sc = (sp[k] * invsa) >> 8;
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int bc = (bp[k] * invba) >> 8;
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int rc;
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/* Uncomposite */
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sc = (((sc-bc)*invha)>>8) + bc;
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if (sc < 0) sc = 0;
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if (sc > 255) sc = 255;
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switch (blendmode)
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{
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default:
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case FZ_BLEND_NORMAL: rc = sc; break;
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case FZ_BLEND_MULTIPLY: rc = fz_mul255(bc, sc); break;
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case FZ_BLEND_SCREEN: rc = fz_screen_byte(bc, sc); break;
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case FZ_BLEND_OVERLAY: rc = fz_overlay_byte(bc, sc); break;
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case FZ_BLEND_DARKEN: rc = fz_darken_byte(bc, sc); break;
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case FZ_BLEND_LIGHTEN: rc = fz_lighten_byte(bc, sc); break;
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case FZ_BLEND_COLOR_DODGE: rc = fz_color_dodge_byte(bc, sc); break;
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case FZ_BLEND_COLOR_BURN: rc = fz_color_burn_byte(bc, sc); break;
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case FZ_BLEND_HARD_LIGHT: rc = fz_hard_light_byte(bc, sc); break;
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case FZ_BLEND_SOFT_LIGHT: rc = fz_soft_light_byte(bc, sc); break;
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case FZ_BLEND_DIFFERENCE: rc = fz_difference_byte(bc, sc); break;
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case FZ_BLEND_EXCLUSION: rc = fz_exclusion_byte(bc, sc); break;
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}
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rc = fz_mul255(255 - haa, bc) + fz_mul255(fz_mul255(255 - ba, sc), haa) + fz_mul255(baha, rc);
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if (rc < 0) rc = 0;
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if (rc > 255) rc = 255;
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bp[k] = fz_mul255(rc, ra);
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}
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}
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sp += n;
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bp += n;
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}
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}
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static void
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fz_blend_nonseparable_nonisolated(byte * restrict bp, byte * restrict sp, int w, int blendmode, byte * restrict hp, int alpha)
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{
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while (w--)
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{
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int ha = *hp++;
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int haa = fz_mul255(ha, alpha);
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if (haa != 0)
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{
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int sa = sp[3];
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int ba = bp[3];
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int baha = fz_mul255(ba, haa);
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/* Calculate result_alpha */
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int ra = bp[3] = ba - baha + haa;
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if (ra != 0)
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{
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/* Because we are a non-isolated group, we
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* need to 'uncomposite' before we blend
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* (recomposite). We assume that normal
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* blending has been done inside the group,
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* so: ra.rc = (1-ha).bc + ha.sc
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* A bit of rearrangement, and that gives us
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* that: sc = (ra.rc - bc)/ha + bc
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* Now, the result of the blend was stored in
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* src, so: */
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int invha = ha ? 255 * 256 / ha : 0;
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int rr, rg, rb;
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/* ugh, division to get non-premul components */
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int invsa = sa ? 255 * 256 / sa : 0;
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int invba = ba ? 255 * 256 / ba : 0;
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int sr = (sp[0] * invsa) >> 8;
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int sg = (sp[1] * invsa) >> 8;
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int sb = (sp[2] * invsa) >> 8;
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int br = (bp[0] * invba) >> 8;
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int bg = (bp[1] * invba) >> 8;
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int bb = (bp[2] * invba) >> 8;
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/* Uncomposite */
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sr = (((sr-br)*invha)>>8) + br;
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sg = (((sg-bg)*invha)>>8) + bg;
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sb = (((sb-bb)*invha)>>8) + bb;
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switch (blendmode)
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{
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default:
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case FZ_BLEND_HUE:
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fz_hue_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
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case FZ_BLEND_SATURATION:
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fz_saturation_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
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case FZ_BLEND_COLOR:
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fz_color_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
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break;
|
|
case FZ_BLEND_LUMINOSITY:
|
|
fz_luminosity_rgb(&rr, &rg, &rb, br, bg, bb, sr, sg, sb);
|
|
break;
|
|
}
|
|
|
|
rr = fz_mul255(255 - haa, bp[0]) + fz_mul255(fz_mul255(255 - ba, sr), haa) + fz_mul255(baha, rr);
|
|
rg = fz_mul255(255 - haa, bp[1]) + fz_mul255(fz_mul255(255 - ba, sg), haa) + fz_mul255(baha, rg);
|
|
rb = fz_mul255(255 - haa, bp[2]) + fz_mul255(fz_mul255(255 - ba, sb), haa) + fz_mul255(baha, rb);
|
|
bp[0] = fz_mul255(ra, rr);
|
|
bp[1] = fz_mul255(ra, rg);
|
|
bp[2] = fz_mul255(ra, rb);
|
|
}
|
|
}
|
|
|
|
sp += 4;
|
|
bp += 4;
|
|
}
|
|
}
|
|
|
|
void
|
|
fz_blend_pixmap(fz_pixmap *dst, fz_pixmap *src, int alpha, int blendmode, int isolated, fz_pixmap *shape)
|
|
{
|
|
unsigned char *sp, *dp;
|
|
fz_bbox bbox;
|
|
int x, y, w, h, n;
|
|
|
|
/* TODO: fix this hack! */
|
|
if (isolated && alpha < 255)
|
|
{
|
|
sp = src->samples;
|
|
n = src->w * src->h * src->n;
|
|
while (n--)
|
|
{
|
|
*sp = fz_mul255(*sp, alpha);
|
|
sp++;
|
|
}
|
|
}
|
|
|
|
bbox = fz_bound_pixmap(dst);
|
|
bbox = fz_intersect_bbox(bbox, fz_bound_pixmap(src));
|
|
|
|
x = bbox.x0;
|
|
y = bbox.y0;
|
|
w = bbox.x1 - bbox.x0;
|
|
h = bbox.y1 - bbox.y0;
|
|
|
|
n = src->n;
|
|
sp = src->samples + ((y - src->y) * src->w + (x - src->x)) * n;
|
|
dp = dst->samples + ((y - dst->y) * dst->w + (x - dst->x)) * n;
|
|
|
|
assert(src->n == dst->n);
|
|
|
|
if (!isolated)
|
|
{
|
|
unsigned char *hp = shape->samples + (y - shape->y) * shape->w + (x - shape->x);
|
|
|
|
while (h--)
|
|
{
|
|
if (n == 4 && blendmode >= FZ_BLEND_HUE)
|
|
fz_blend_nonseparable_nonisolated(dp, sp, w, blendmode, hp, alpha);
|
|
else
|
|
fz_blend_separable_nonisolated(dp, sp, n, w, blendmode, hp, alpha);
|
|
sp += src->w * n;
|
|
dp += dst->w * n;
|
|
hp += shape->w;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
while (h--)
|
|
{
|
|
if (n == 4 && blendmode >= FZ_BLEND_HUE)
|
|
fz_blend_nonseparable(dp, sp, w, blendmode);
|
|
else
|
|
fz_blend_separable(dp, sp, n, w, blendmode);
|
|
sp += src->w * n;
|
|
dp += dst->w * n;
|
|
}
|
|
}
|
|
}
|