Function isSpriteInteractedWithPaletteSet

src/OpenLoco/src/Paint/Paint.cpp:1157–1212

0x00447A5F

    // 0x00447A5F
    static bool isSpriteInteractedWithPaletteSet(const Gfx::RenderTarget* rt, ImageId imageId, const Ui::Point& coords, const Gfx::PaletteMap::View paletteMap)
    {
        const auto* g1 = Gfx::getG1Element(imageId.getIndex());
        if (g1 == nullptr)
        {
            return false;
        }

        auto zoomLevel = rt->zoomLevel;
        Ui::Point interactionPoint{ rt->x, rt->y };
        Ui::Point origin = coords;

        if (zoomLevel > 0)
        {
            if (g1->hasFlags(Gfx::G1ElementFlags::noZoomDraw))
            {
                return false;
            }

            while (g1->hasFlags(Gfx::G1ElementFlags::hasZoomSprites) && zoomLevel > 0)
            {
                imageId = ImageId(imageId.getIndex() - g1->zoomOffset);
                g1 = Gfx::getG1Element(imageId.getIndex());
                if (g1 == nullptr || g1->hasFlags(Gfx::G1ElementFlags::noZoomDraw))
                {
                    return false;
                }
                zoomLevel = zoomLevel - 1;
                interactionPoint.x >>= 1;
                interactionPoint.y >>= 1;
                origin.x >>= 1;
                origin.y >>= 1;
            }
        }

        origin.x += g1->xOffset;
        origin.y += g1->yOffset;
        interactionPoint -= origin;

        if (interactionPoint.x < 0 || interactionPoint.y < 0 || interactionPoint.x >= g1->width || interactionPoint.y >= g1->height)
        {
            return false;
        }

        if (g1->hasFlags(Gfx::G1ElementFlags::isRLECompressed))
        {
            return isPixelPresentRLE(*g1, interactionPoint);
        }

        if (!g1->hasFlags(Gfx::G1ElementFlags::unk1))
        {
            return isPixelPresentBMP(imageId, *g1, interactionPoint, paletteMap);
        }

        return false;
    }

    // 0x00447A0E