libsplashscreen/libpng/png.c

1227 png_xy_from_XYZ(png_xy *xy, const png_XYZ *XYZ)
1232    if (png_muldiv(&xy->redx, XYZ->red_X, PNG_FP_1, d) == 0)
1234    if (png_muldiv(&xy->redy, XYZ->red_Y, PNG_FP_1, d) == 0)
1241    if (png_muldiv(&xy->greenx, XYZ->green_X, PNG_FP_1, d) == 0)
1243    if (png_muldiv(&xy->greeny, XYZ->green_Y, PNG_FP_1, d) == 0)
1250    if (png_muldiv(&xy->bluex, XYZ->blue_X, PNG_FP_1, d) == 0)
1252    if (png_muldiv(&xy->bluey, XYZ->blue_Y, PNG_FP_1, d) == 0)
1261    if (png_muldiv(&xy->whitex, whiteX, PNG_FP_1, dwhite) == 0)
1263    if (png_muldiv(&xy->whitey, whiteY, PNG_FP_1, dwhite) == 0)
1270 png_XYZ_from_xy(png_XYZ *XYZ, const png_xy *xy)
1275    /* Check xy and, implicitly, z.  Note that wide gamut color spaces typically
1278     * xy->whitey against 5, not 0, to avoid a possible integer overflow.
1280    if (xy->redx   < 0 || xy->redx > PNG_FP_1) return 1;
1281    if (xy->redy   < 0 || xy->redy > PNG_FP_1-xy->redx) return 1;
1282    if (xy->greenx < 0 || xy->greenx > PNG_FP_1) return 1;
1283    if (xy->greeny < 0 || xy->greeny > PNG_FP_1-xy->greenx) return 1;
1284    if (xy->bluex  < 0 || xy->bluex > PNG_FP_1) return 1;
1285    if (xy->bluey  < 0 || xy->bluey > PNG_FP_1-xy->bluex) return 1;
1286    if (xy->whitex < 0 || xy->whitex > PNG_FP_1) return 1;
1287    if (xy->whitey < 5 || xy->whitey > PNG_FP_1-xy->whitex) return 1;
1468    if (png_muldiv(&left, xy->greenx-xy->bluex, xy->redy - xy->bluey, 7) == 0)
1470    if (png_muldiv(&right, xy->greeny-xy->bluey, xy->redx - xy->bluex, 7) == 0)
1475    if (png_muldiv(&left, xy->greenx-xy->bluex, xy->whitey-xy->bluey, 7) == 0)
1477    if (png_muldiv(&right, xy->greeny-xy->bluey, xy->whitex-xy->bluex, 7) == 0)
1485    if (png_muldiv(&red_inverse, xy->whitey, denominator, left-right) == 0 ||
1486        red_inverse <= xy->whitey /* r+g+b scales = white scale */)
1490    if (png_muldiv(&left, xy->redy-xy->bluey, xy->whitex-xy->bluex, 7) == 0)
1492    if (png_muldiv(&right, xy->redx-xy->bluex, xy->whitey-xy->bluey, 7) == 0)
1494    if (png_muldiv(&green_inverse, xy->whitey, denominator, left-right) == 0 ||
1495        green_inverse <= xy->whitey)
1501    blue_scale = png_reciprocal(xy->whitey) - png_reciprocal(red_inverse) -
1508    if (png_muldiv(&XYZ->red_X, xy->redx, PNG_FP_1, red_inverse) == 0)
1510    if (png_muldiv(&XYZ->red_Y, xy->redy, PNG_FP_1, red_inverse) == 0)
1512    if (png_muldiv(&XYZ->red_Z, PNG_FP_1 - xy->redx - xy->redy, PNG_FP_1,
1516    if (png_muldiv(&XYZ->green_X, xy->greenx, PNG_FP_1, green_inverse) == 0)
1518    if (png_muldiv(&XYZ->green_Y, xy->greeny, PNG_FP_1, green_inverse) == 0)
1520    if (png_muldiv(&XYZ->green_Z, PNG_FP_1 - xy->greenx - xy->greeny, PNG_FP_1,
1524    if (png_muldiv(&XYZ->blue_X, xy->bluex, blue_scale, PNG_FP_1) == 0)
1526    if (png_muldiv(&XYZ->blue_Y, xy->bluey, blue_scale, PNG_FP_1) == 0)
1528    if (png_muldiv(&XYZ->blue_Z, PNG_FP_1 - xy->bluex - xy->bluey, blue_scale,
1608  * check is to round-trip xy -> XYZ -> xy and then check that the result is
1612 png_colorspace_check_xy(png_XYZ *XYZ, const png_xy *xy)
1618    result = png_XYZ_from_xy(XYZ, xy);
1626    if (png_colorspace_endpoints_match(xy, &xy_test,
1635  * (another side-effect) and the xy chromaticities are returned.
1638 png_colorspace_check_XYZ(png_xy *xy, png_XYZ *XYZ)
1647    result = png_xy_from_XYZ(xy, XYZ);
1652    return png_colorspace_check_xy(&XYZtemp, xy);
1667     png_colorspacerp colorspace, const png_xy *xy, const png_XYZ *XYZ,
1683       if (png_colorspace_endpoints_match(xy, &colorspace->end_points_xy,
1696    colorspace->end_points_xy = *xy;
1703    if (png_colorspace_endpoints_match(xy, &sRGB_xy, 1000) != 0)
1715     png_colorspacerp colorspace, const png_xy *xy, int preferred)
1725    switch (png_colorspace_check_xy(&XYZ, xy))
1728          return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, xy, &XYZ,
1755    png_xy xy;
1757    switch (png_colorspace_check_XYZ(&xy, &XYZ))
1760          return png_colorspace_set_xy_and_XYZ(png_ptr, colorspace, &xy, &XYZ,