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/*
* Copyright (c) 2021 - 2023 the ThorVG project. All rights reserved.
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
{
float _dudx = dudx, _dvdx = dvdx;
float _dxdya = dxdya, _dxdyb = dxdyb, _dudya = dudya, _dvdya = dvdya;
float _xa = xa, _xb = xb, _ua = ua, _va = va;
auto sbuf = image->buf32;
auto dbuf = surface->buf32;
int32_t sw = static_cast<int32_t>(image->stride);
int32_t sh = image->h;
int32_t dw = surface->stride;
int32_t x1, x2, x, y, ar, ab, iru, irv, px, ay;
int32_t vv = 0, uu = 0;
int32_t minx = INT32_MAX, maxx = INT32_MIN;
float dx, u, v, iptr;
uint32_t* buf;
SwSpan* span = nullptr; //used only when rle based.
#ifdef TEXMAP_MASKING
uint8_t* cmp;
auto csize = surface->compositor->image.channelSize;
#endif
if (!_arrange(image, region, yStart, yEnd)) return;
//Loop through all lines in the segment
uint32_t spanIdx = 0;
if (region) {
minx = region->min.x;
maxx = region->max.x;
} else {
span = image->rle->spans;
while (span->y < yStart) {
++span;
++spanIdx;
}
}
y = yStart;
while (y < yEnd) {
x1 = (int32_t)_xa;
x2 = (int32_t)_xb;
if (!region) {
minx = INT32_MAX;
maxx = INT32_MIN;
//one single row, could be consisted of multiple spans.
while (span->y == y && spanIdx < image->rle->size) {
if (minx > span->x) minx = span->x;
if (maxx < span->x + span->len) maxx = span->x + span->len;
++span;
++spanIdx;
}
}
if (x1 < minx) x1 = minx;
if (x2 > maxx) x2 = maxx;
//Anti-Aliasing frames
ay = y - aaSpans->yStart;
if (aaSpans->lines[ay].x[0] > x1) aaSpans->lines[ay].x[0] = x1;
if (aaSpans->lines[ay].x[1] < x2) aaSpans->lines[ay].x[1] = x2;
//Range exception
if ((x2 - x1) < 1 || (x1 >= maxx) || (x2 <= minx)) goto next;
//Perform subtexel pre-stepping on UV
dx = 1 - (_xa - x1);
u = _ua + dx * _dudx;
v = _va + dx * _dvdx;
buf = dbuf + ((y * dw) + x1);
x = x1;
#ifdef TEXMAP_MASKING
cmp = &surface->compositor->image.buf8[(y * surface->compositor->image.stride + x1) * csize];
#endif
//Draw horizontal line
while (x++ < x2) {
uu = (int) u;
vv = (int) v;
ar = (int)(255 * (1 - modff(u, &iptr)));
ab = (int)(255 * (1 - modff(v, &iptr)));
iru = uu + 1;
irv = vv + 1;
if (vv >= sh) continue;
px = *(sbuf + (vv * sw) + uu);
/* horizontal interpolate */
if (iru < sw) {
/* right pixel */
int px2 = *(sbuf + (vv * sw) + iru);
px = INTERPOLATE(ar, px, px2);
}
/* vertical interpolate */
if (irv < sh) {
/* bottom pixel */
int px2 = *(sbuf + (irv * sw) + uu);
/* horizontal interpolate */
if (iru < sw) {
/* bottom right pixel */
int px3 = *(sbuf + (irv * sw) + iru);
px2 = INTERPOLATE(ar, px2, px3);
}
px = INTERPOLATE(ab, px, px2);
}
#if defined(TEXMAP_MASKING) && defined(TEXMAP_TRANSLUCENT)
auto src = ALPHA_BLEND(px, _multiply<uint32_t>(opacity, blender(cmp)));
#elif defined(TEXMAP_MASKING)
auto src = ALPHA_BLEND(px, blender(cmp));
#elif defined(TEXMAP_TRANSLUCENT)
auto src = ALPHA_BLEND(px, opacity);
#else
auto src = px;
#endif
*buf = src + ALPHA_BLEND(*buf, _ialpha(src));
++buf;
#ifdef TEXMAP_MASKING
cmp += csize;
#endif
//Step UV horizontally
u += _dudx;
v += _dvdx;
//range over?
if ((uint32_t)v >= image->h) break;
}
next:
//Step along both edges
_xa += _dxdya;
_xb += _dxdyb;
_ua += _dudya;
_va += _dvdya;
if (!region && spanIdx >= image->rle->size) break;
++y;
}
xa = _xa;
xb = _xb;
ua = _ua;
va = _va;
}
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