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#define __NR_GRADIENT_C__
/*
* Pixel buffer rendering library
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
*
* Copyright (C) 2001-2002 Lauris Kaplinski
* Copyright (C) 2001-2002 Ximian, Inc.
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include <libnr/nr-pixops.h>
#include <libnr/nr-pixblock-pixel.h>
#include "nr-gradient-gpl.h"
#define noNR_USE_GENERIC_RENDERER
#define NRG_MASK (NR_GRADIENT_VECTOR_LENGTH - 1)
#define NRG_2MASK ((NR_GRADIENT_VECTOR_LENGTH << 1) - 1)
static void nr_lgradient_render_block (NRRenderer *r, NRPixBlock *pb, NRPixBlock *m);
static void nr_lgradient_render_R8G8B8A8N_EMPTY (NRLGradientRenderer *lgr, unsigned char *px, int x0, int y0, int width, int height, int rs);
static void nr_lgradient_render_R8G8B8A8N (NRLGradientRenderer *lgr, unsigned char *px, int x0, int y0, int width, int height, int rs);
static void nr_lgradient_render_R8G8B8 (NRLGradientRenderer *lgr, unsigned char *px, int x0, int y0, int width, int height, int rs);
static void nr_lgradient_render_generic (NRLGradientRenderer *lgr, NRPixBlock *pb);
NRRenderer *
nr_lgradient_renderer_setup (NRLGradientRenderer *lgr,
const unsigned char *cv,
unsigned int spread,
const NRMatrix *gs2px,
float x0, float y0,
float x1, float y1)
{
NRMatrix n2gs, n2px, px2n;
lgr->renderer.render = nr_lgradient_render_block;
lgr->vector = cv;
lgr->spread = spread;
n2gs.c[0] = x1 - x0;
n2gs.c[1] = y1 - y0;
n2gs.c[2] = y1 - y0;
n2gs.c[3] = x0 - x1;
n2gs.c[4] = x0;
n2gs.c[5] = y0;
nr_matrix_multiply (&n2px, &n2gs, gs2px);
nr_matrix_invert (&px2n, &n2px);
lgr->x0 = n2px.c[4] - 0.5;
lgr->y0 = n2px.c[5] - 0.5;
lgr->dx = px2n.c[0] * NR_GRADIENT_VECTOR_LENGTH;
lgr->dy = px2n.c[2] * NR_GRADIENT_VECTOR_LENGTH;
return (NRRenderer *) lgr;
}
static void
nr_lgradient_render_block (NRRenderer *r, NRPixBlock *pb, NRPixBlock *m)
{
NRLGradientRenderer *lgr;
int width, height;
lgr = (NRLGradientRenderer *) r;
width = pb->area.x1 - pb->area.x0;
height = pb->area.y1 - pb->area.y0;
#ifdef NR_USE_GENERIC_RENDERER
nr_lgradient_render_generic (lgr, pb);
#else
if (pb->empty) {
switch (pb->mode) {
case NR_PIXBLOCK_MODE_A8:
nr_lgradient_render_generic (lgr, pb);
break;
case NR_PIXBLOCK_MODE_R8G8B8:
nr_lgradient_render_generic (lgr, pb);
break;
case NR_PIXBLOCK_MODE_R8G8B8A8N:
nr_lgradient_render_R8G8B8A8N_EMPTY (lgr, NR_PIXBLOCK_PX (pb), pb->area.x0, pb->area.y0, width, height, pb->rs);
break;
case NR_PIXBLOCK_MODE_R8G8B8A8P:
nr_lgradient_render_generic (lgr, pb);
break;
default:
break;
}
} else {
switch (pb->mode) {
case NR_PIXBLOCK_MODE_A8:
nr_lgradient_render_generic (lgr, pb);
break;
case NR_PIXBLOCK_MODE_R8G8B8:
nr_lgradient_render_R8G8B8 (lgr, NR_PIXBLOCK_PX (pb), pb->area.x0, pb->area.y0, width, height, pb->rs);
break;
case NR_PIXBLOCK_MODE_R8G8B8A8N:
nr_lgradient_render_R8G8B8A8N (lgr, NR_PIXBLOCK_PX (pb), pb->area.x0, pb->area.y0, width, height, pb->rs);
break;
case NR_PIXBLOCK_MODE_R8G8B8A8P:
nr_lgradient_render_generic (lgr, pb);
break;
default:
break;
}
}
#endif
}
static void
nr_lgradient_render_R8G8B8A8N_EMPTY (NRLGradientRenderer *lgr, unsigned char *px, int x0, int y0, int width, int height, int rs)
{
int x, y;
double pos;
for (y = 0; y < height; y++) {
const unsigned char *s;
unsigned char *d;
int idx;
d = px + y * rs;
pos = (y + y0 - lgr->y0) * lgr->dy + (0 + x0 - lgr->x0) * lgr->dx;
if (lgr->spread == NR_GRADIENT_SPREAD_PAD) {
for (x = 0; x < width; x++) {
idx = (int) CLAMP (pos, 0, (double) NRG_MASK);
s = lgr->vector + 4 * idx;
d[0] = s[0];
d[1] = s[1];
d[2] = s[2];
d[3] = s[3];
d += 4;
pos += lgr->dx;
}
} else if (lgr->spread == NR_GRADIENT_SPREAD_REFLECT) {
for (x = 0; x < width; x++) {
idx = (int) ((long long) pos & NRG_2MASK);
if (idx > NRG_MASK) idx = NRG_2MASK - idx;
s = lgr->vector + 4 * idx;
d[0] = s[0];
d[1] = s[1];
d[2] = s[2];
d[3] = s[3];
d += 4;
pos += lgr->dx;
}
} else {
for (x = 0; x < width; x++) {
idx = (int) ((long long) pos & NRG_MASK);
s = lgr->vector + 4 * idx;
d[0] = s[0];
d[1] = s[1];
d[2] = s[2];
d[3] = s[3];
d += 4;
pos += lgr->dx;
}
}
}
}
static void
nr_lgradient_render_R8G8B8A8N (NRLGradientRenderer *lgr, unsigned char *px, int x0, int y0, int width, int height, int rs)
{
int x, y;
unsigned char *d;
double pos;
for (y = 0; y < height; y++) {
d = px + y * rs;
pos = (y + y0 - lgr->y0) * lgr->dy + (0 + x0 - lgr->x0) * lgr->dx;
for (x = 0; x < width; x++) {
int idx;
unsigned int ca;
const unsigned char *s;
switch (lgr->spread) {
case NR_GRADIENT_SPREAD_PAD:
idx = (int) CLAMP (pos, 0, (double) NRG_MASK);
break;
case NR_GRADIENT_SPREAD_REFLECT:
idx = (int) ((long long) pos & NRG_2MASK);
if (idx > NRG_MASK) idx = NRG_2MASK - idx;
break;
case NR_GRADIENT_SPREAD_REPEAT:
idx = (int) ((long long) pos & NRG_MASK);
break;
default:
idx = 0;
break;
}
/* Full composition */
s = lgr->vector + 4 * idx;
if (s[3] == 255) {
d[0] = s[0];
d[1] = s[1];
d[2] = s[2];
d[3] = 255;
} else if (s[3] != 0) {
ca = NR_COMPOSEA_112(s[3],d[3]);
d[0] = NR_COMPOSENNN_111121 (s[0], s[3], d[0], d[3], ca);
d[1] = NR_COMPOSENNN_111121 (s[1], s[3], d[1], d[3], ca);
d[2] = NR_COMPOSENNN_111121 (s[2], s[3], d[2], d[3], ca);
d[3] = NR_NORMALIZE_21(ca);
}
d += 4;
pos += lgr->dx;
}
}
}
static void
nr_lgradient_render_R8G8B8 (NRLGradientRenderer *lgr, unsigned char *px, int x0, int y0, int width, int height, int rs)
{
int x, y;
unsigned char *d;
double pos;
for (y = 0; y < height; y++) {
d = px + y * rs;
pos = (y + y0 - lgr->y0) * lgr->dy + (0 + x0 - lgr->x0) * lgr->dx;
for (x = 0; x < width; x++) {
int idx;
const unsigned char *s;
switch (lgr->spread) {
case NR_GRADIENT_SPREAD_PAD:
idx = (int) CLAMP (pos, 0, (double) NRG_MASK);
break;
case NR_GRADIENT_SPREAD_REFLECT:
idx = (int) ((long long) pos & NRG_2MASK);
if (idx > NRG_MASK) idx = NRG_2MASK - idx;
break;
case NR_GRADIENT_SPREAD_REPEAT:
idx = (int) ((long long) pos & NRG_MASK);
break;
default:
idx = 0;
break;
}
/* Full composition */
s = lgr->vector + 4 * idx;
d[0] = NR_COMPOSEN11_1111 (s[0], s[3], d[0]);
d[1] = NR_COMPOSEN11_1111 (s[1], s[3], d[1]);
d[2] = NR_COMPOSEN11_1111 (s[2], s[3], d[2]);
d += 3;
pos += lgr->dx;
}
}
}
static void
nr_lgradient_render_generic (NRLGradientRenderer *lgr, NRPixBlock *pb)
{
int x, y;
unsigned char *d;
double pos;
int bpp;
NRPixBlock spb;
int x0, y0, width, height, rs;
x0 = pb->area.x0;
y0 = pb->area.y0;
width = pb->area.x1 - pb->area.x0;
height = pb->area.y1 - pb->area.y0;
rs = pb->rs;
nr_pixblock_setup_extern (&spb, NR_PIXBLOCK_MODE_R8G8B8A8N, 0, 0, NR_GRADIENT_VECTOR_LENGTH, 1,
(unsigned char *) lgr->vector,
4 * NR_GRADIENT_VECTOR_LENGTH,
0, 0);
spb.visible_area = pb->visible_area;
bpp = (pb->mode == NR_PIXBLOCK_MODE_A8) ? 1 : (pb->mode == NR_PIXBLOCK_MODE_R8G8B8) ? 3 : 4;
for (y = 0; y < height; y++) {
d = NR_PIXBLOCK_PX (pb) + y * rs;
pos = (y + y0 - lgr->y0) * lgr->dy + (0 + x0 - lgr->x0) * lgr->dx;
for (x = 0; x < width; x++) {
int idx;
const unsigned char *s;
switch (lgr->spread) {
case NR_GRADIENT_SPREAD_PAD:
idx = (int) CLAMP (pos, 0, (double) NRG_MASK);
break;
case NR_GRADIENT_SPREAD_REFLECT:
idx = (int) ((long long) pos & NRG_2MASK);
if (idx > NRG_MASK) idx = NRG_2MASK - idx;
break;
case NR_GRADIENT_SPREAD_REPEAT:
idx = (int) ((long long) pos & NRG_MASK);
break;
default:
idx = 0;
break;
}
s = lgr->vector + 4 * idx;
nr_compose_pixblock_pixblock_pixel (pb, d, &spb, s);
d += bpp;
pos += lgr->dx;
}
}
nr_pixblock_release (&spb);
}
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