diff options
Diffstat (limited to 'render/rastshade.c')
| -rw-r--r-- | render/rastshade.c | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/render/rastshade.c b/render/rastshade.c deleted file mode 100644 index b002de82..00000000 --- a/render/rastshade.c +++ /dev/null @@ -1,168 +0,0 @@ -#include <fitz.h> - -typedef struct fz_vertex -{ - float x, y; - float l; -} fz_vertex; - -typedef struct fz_triangle -{ - fz_vertex vertex[3]; -} fz_triangle; - -#define putpixel(x, y, c) \ - if (x >= 0 && x < dstp->w && y >= 0 && y < dstp->h) { \ - dstp->samples[((x)+(y)*(dstp->w))*4+0] = 255; \ - dstp->samples[((x)+(y)*(dstp->w))*4+1] = c[0]; \ - dstp->samples[((x)+(y)*(dstp->w))*4+2] = c[1]; \ - dstp->samples[((x)+(y)*(dstp->w))*4+3] = c[2]; \ - } \ - -void fz_swapvertex(fz_vertex *a, fz_vertex *b) -{ - fz_vertex temp; - temp = *a; - *a = *b; - *b = temp; -} - -fz_error * -fz_drawgouraudtriangle(fz_triangle triangle, fz_pixmap *dstp, int destcol[512][4], - int bx0, int by0, int bx1, int by1) -{ - fz_error *error; - fz_vertex a, b, c; - - a = triangle.vertex[0]; - b = triangle.vertex[1]; - c = triangle.vertex[2]; - - /* need more accurate clipping method */ - { - fz_rect bb1; - fz_rect bb2; - - bb1.min.x = MIN(MIN(a.x, b.x), c.x); - bb1.min.y = MIN(MIN(a.y, b.y), c.y); - bb1.max.x = MAX(MAX(a.x, b.x), c.x); - bb1.max.y = MAX(MAX(a.y, b.y), c.y); - - bb2.min.x = bx0; - bb2.min.y = by0; - bb2.max.x = bx1; - bb2.max.y = by1; - - if (fz_isemptyrect(fz_intersectrects(bb1, bb2))) - return nil; - } - - if(a.y > b.y) fz_swapvertex(&a, &b); - if(a.y > c.y) fz_swapvertex(&a, &c); - if(b.y > c.y) fz_swapvertex(&b, &c); - - float diff_y = (b.y - a.y); - float slopeab_x = (b.x - a.x) / diff_y; - float slopeab_l = (b.l - a.l) / diff_y; - float xab = a.x; - float lab = a.l; - diff_y = (c.y - a.y); - float slopeac_x = (c.x - a.x) / diff_y; - float slopeac_l = (c.l - a.l) / diff_y; - float xac = a.x; - float lac = a.l; - int maxy = (int)(b.y); - - int incx; - int y; - for(y = (int)(a.y); y < maxy; y++) - { - int maxx = (int)(xac); - if(xab < xac) incx = 1; - else incx = -1; - float diff_x = (xac - xab) * incx; - float slope_l = (lac - lab) / diff_x; - float l = lab; - - for(int x = (int)(xab); x != maxx+incx; x += incx) - { - if (l < 0) l = 0; - if (l > 511) l = 511; - putpixel(x, y, destcol[(int)(l)]); - l += slope_l; - } - - xab += slopeab_x; - lab += slopeab_l; - xac += slopeac_x; - lac += slopeac_l; - } - - diff_y = (c.y - b.y); - float slopebc_x = (c.x - b.x) / diff_y; - float slopebc_l = (c.l - b.l) / diff_y; - float xbc = b.x; - float lbc = b.l; - maxy = (int)(c.y); - for(; y < maxy; y++) - { - int maxx = (int)(xac); - if(xbc < xac) incx = 1; - else incx = -1; - float diff_x = (xac - xbc) * incx; - float slope_l = (lac - lbc) / diff_x; - float l = lbc; - for(int x = (int)(xbc); x != maxx+incx; x += incx) - { - if (l < 0) l = 0; - if (l > 511) l = 511; - putpixel(x, y, destcol[(int)(l)]); - l += slope_l; - } - - xac += slopeac_x; - lac += slopeac_l; - xbc += slopebc_x; - lbc += slopebc_l; - } - - return nil; -} - -fz_error * -fz_rendershade(fz_shade *shade, fz_matrix ctm, fz_colorspace *dsts, fz_pixmap *dstp) -{ - int x, y; - fz_triangle triangle; - fz_point point; - int destcol[512][4]; - - for (int i=0; i<512; ++i) { - float col[4]; - shade->colorspace->convcolor(shade->colorspace, - shade->function[i], dsts, col); - for (int j=0; j<3; ++j) { - destcol[i][j] = col[j] * 255; - } - } - - if (!shade) return nil; - - ctm = fz_concat(shade->matrix, ctm); - ctm = fz_concat(ctm, fz_translate(-dstp->x, -dstp->y)); - - int ncomp = shade->meshcap; - for (int i=0; i<shade->meshlen; ++i) { - for (int j=0; j<3; ++j) { - point.x = shade->mesh[(i*3+j)*3+0]; - point.y = shade->mesh[(i*3+j)*3+1]; - point = fz_transformpoint(ctm, point); - triangle.vertex[j].x = point.x; - triangle.vertex[j].y = point.y; - triangle.vertex[j].l = shade->mesh[(i*3+j)*3+2]; - } - fz_drawgouraudtriangle(triangle, dstp, destcol, 0, 0, dstp->w, dstp->h); - } - - return nil; -} |