hyperion.ng/libsrc/hyperion/ImageToLedsMap.cpp
2021-05-16 18:33:24 +02:00

87 lines
2.3 KiB
C++

#include <hyperion/ImageToLedsMap.h>
using namespace hyperion;
ImageToLedsMap::ImageToLedsMap(
unsigned width,
unsigned height,
unsigned horizontalBorder,
unsigned verticalBorder,
const std::vector<Led>& leds)
: _width(width)
, _height(height)
, _horizontalBorder(horizontalBorder)
, _verticalBorder(verticalBorder)
, _colorsMap()
{
// Sanity check of the size of the borders (and width and height)
Q_ASSERT(_width > 2*_verticalBorder);
Q_ASSERT(_height > 2*_horizontalBorder);
Q_ASSERT(_width < 10000);
Q_ASSERT(_height < 10000);
// Reserve enough space in the map for the leds
_colorsMap.reserve(leds.size());
const unsigned xOffset = _verticalBorder;
const unsigned actualWidth = _width - 2 * _verticalBorder;
const unsigned yOffset = _horizontalBorder;
const unsigned actualHeight = _height - 2 * _horizontalBorder;
for (const Led& led : leds)
{
// skip leds without area
if ((led.maxX_frac-led.minX_frac) < 1e-6 || (led.maxY_frac-led.minY_frac) < 1e-6)
{
_colorsMap.emplace_back();
continue;
}
// Compute the index boundaries for this led
unsigned minX_idx = xOffset + unsigned(qRound(actualWidth * led.minX_frac));
unsigned maxX_idx = xOffset + unsigned(qRound(actualWidth * led.maxX_frac));
unsigned minY_idx = yOffset + unsigned(qRound(actualHeight * led.minY_frac));
unsigned maxY_idx = yOffset + unsigned(qRound(actualHeight * led.maxY_frac));
// make sure that the area is at least a single led large
minX_idx = qMin(minX_idx, xOffset + actualWidth - 1);
if (minX_idx == maxX_idx)
{
maxX_idx++;
}
minY_idx = qMin(minY_idx, yOffset + actualHeight - 1);
if (minY_idx == maxY_idx)
{
maxY_idx++;
}
// Add all the indices in the above defined rectangle to the indices for this led
const auto maxYLedCount = qMin(maxY_idx, yOffset+actualHeight);
const auto maxXLedCount = qMin(maxX_idx, xOffset+actualWidth);
std::vector<int32_t> ledColors;
ledColors.reserve((size_t) maxXLedCount*maxYLedCount);
for (unsigned y = minY_idx; y < maxYLedCount; ++y)
{
for (unsigned x = minX_idx; x < maxXLedCount; ++x)
{
ledColors.push_back(y*width + x);
}
}
// Add the constructed vector to the map
_colorsMap.push_back(ledColors);
}
}
unsigned ImageToLedsMap::width() const
{
return _width;
}
unsigned ImageToLedsMap::height() const
{
return _height;
}