diff options
Diffstat (limited to 'pixman/pixman/pixman-edge-imp.h')
| -rw-r--r-- | pixman/pixman/pixman-edge-imp.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/pixman/pixman/pixman-edge-imp.h b/pixman/pixman/pixman-edge-imp.h new file mode 100644 index 000000000..016bfaba7 --- /dev/null +++ b/pixman/pixman/pixman-edge-imp.h @@ -0,0 +1,154 @@ +/* + * 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 |