| /* |
| * Copyright © 2004 Keith Packard |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that |
| * copyright notice and this permission notice appear in supporting |
| * documentation, and that the name of Keith Packard not be used in |
| * advertising or publicity pertaining to distribution of the software without |
| * specific, written prior permission. Keith Packard makes no |
| * representations about the suitability of this software for any purpose. It |
| * is provided "as is" without express or implied warranty. |
| * |
| * KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL KEITH PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| * PERFORMANCE OF THIS SOFTWARE. |
| */ |
| |
| #ifndef rasterizeSpan |
| #endif |
| |
| static void |
| rasterizeEdges (pixman_image_t *image, |
| pixman_edge_t *l, |
| pixman_edge_t *r, |
| pixman_fixed_t t, |
| pixman_fixed_t b) |
| { |
| pixman_fixed_t y = t; |
| uint32_t *line; |
| uint32_t *buf = (image)->bits.bits; |
| int stride = (image)->bits.rowstride; |
| int width = (image)->bits.width; |
| |
| line = buf + pixman_fixed_to_int (y) * stride; |
| |
| for (;;) |
| { |
| pixman_fixed_t lx; |
| pixman_fixed_t rx; |
| int lxi; |
| int rxi; |
| |
| lx = l->x; |
| rx = r->x; |
| #if N_BITS == 1 |
| /* For the non-antialiased case, round the coordinates up, in effect |
| * sampling the center of the pixel. (The AA case does a similar |
| * adjustment in RenderSamplesX) */ |
| lx += X_FRAC_FIRST(1); |
| rx += X_FRAC_FIRST(1); |
| #endif |
| /* clip X */ |
| if (lx < 0) |
| lx = 0; |
| if (pixman_fixed_to_int (rx) >= width) |
| #if N_BITS == 1 |
| rx = pixman_int_to_fixed (width); |
| #else |
| /* Use the last pixel of the scanline, covered 100%. |
| * We can't use the first pixel following the scanline, |
| * because accessing it could result in a buffer overrun. |
| */ |
| rx = pixman_int_to_fixed (width) - 1; |
| #endif |
| |
| /* Skip empty (or backwards) sections */ |
| if (rx > lx) |
| { |
| |
| /* Find pixel bounds for span */ |
| lxi = pixman_fixed_to_int (lx); |
| rxi = pixman_fixed_to_int (rx); |
| |
| #if N_BITS == 1 |
| { |
| uint32_t *a = line; |
| uint32_t startmask; |
| uint32_t endmask; |
| int nmiddle; |
| int width = rxi - lxi; |
| int x = lxi; |
| |
| a += x >> FB_SHIFT; |
| x &= FB_MASK; |
| |
| FbMaskBits (x, width, startmask, nmiddle, endmask); |
| if (startmask) { |
| WRITE(image, a, READ(image, a) | startmask); |
| a++; |
| } |
| while (nmiddle--) |
| WRITE(image, a++, FB_ALLONES); |
| if (endmask) |
| WRITE(image, a, READ(image, a) | endmask); |
| } |
| #else |
| { |
| DefineAlpha(line,lxi); |
| int lxs; |
| int rxs; |
| |
| /* Sample coverage for edge pixels */ |
| lxs = RenderSamplesX (lx, N_BITS); |
| rxs = RenderSamplesX (rx, N_BITS); |
| |
| /* Add coverage across row */ |
| if (lxi == rxi) |
| { |
| AddAlpha (rxs - lxs); |
| } |
| else |
| { |
| int xi; |
| |
| AddAlpha (N_X_FRAC(N_BITS) - lxs); |
| StepAlpha; |
| for (xi = lxi + 1; xi < rxi; xi++) |
| { |
| AddAlpha (N_X_FRAC(N_BITS)); |
| StepAlpha; |
| } |
| AddAlpha (rxs); |
| } |
| } |
| #endif |
| } |
| |
| if (y == b) |
| break; |
| |
| #if N_BITS > 1 |
| if (pixman_fixed_frac (y) != Y_FRAC_LAST(N_BITS)) |
| { |
| RenderEdgeStepSmall (l); |
| RenderEdgeStepSmall (r); |
| y += STEP_Y_SMALL(N_BITS); |
| } |
| else |
| #endif |
| { |
| RenderEdgeStepBig (l); |
| RenderEdgeStepBig (r); |
| y += STEP_Y_BIG(N_BITS); |
| line += stride; |
| } |
| } |
| } |
| |
| #undef rasterizeSpan |