tdfischer/renderbug-cpp
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figments: surface: handle swapped start/end positions

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This commit is contained in:
Torrie Fischer 2023-12-11 07:47:54 +01:00
parent e5d4eea02b
commit c91757308d
1 changed files with 8 additions and 5 deletions
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13
lib/Figments/Surface.cpp
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@ -54,17 +54,20 @@ void
Surface::paintShader(Surface::Shader shader)
{
PerfCounter _("paintShader");
const uint16_t width = end.x - start.x + 1;
const uint16_t height = end.y - start.y + 1;
uint8_t startX = min(start.x, end.x);
uint8_t startY = min(start.y, end.y);
uint8_t endX = max(start.x, end.x);
uint8_t endY = max(start.y, end.y);
const uint16_t width = endX - startX + 1;
const uint16_t height = endY - startY + 1;
const uint8_t xMod = 255 / width;
const uint8_t yMod = 255 / height;
for(auto x = 0; x < width; x++) {
for(auto y = 0; y < height; y++) {
PhysicalCoordinates coords{x + start.x, y + start.y};
PhysicalCoordinates coords{x + startX, y + startY};
VirtualCoordinates virtCoords{m_display->coordinateMapping()->physicalToVirtualCoords(coords)};
VirtualCoordinates surfaceCoords{xMod * x, yMod * y};
//Log.notice("width=%d height=%d vx=%d vy=%d sx=%d sy=%d x=%d y=%d px=%d py=%d", width, height, start.x, start.y, x, y, coords.x, coords.y);
// 256 = 1.0
//Log.notice("width=%d height=%d vx=%d vy=%d sx=%d sy=%d x=%d y=%d px=%d py=%d", width, height, startX, startY, x, y, coords.x, coords.y); // 256 = 1.0
// 128 = 0.0
// 0 = 1.0
shader(m_display->pixelAt(coords), virtCoords, coords, surfaceCoords);