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add flipY argument to pixelBufferToPng

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This commit is contained in:
Nick Fisher
2025-06-23 12:18:08 +08:00
parent b64a505ffc
commit 920f81c514
1 changed files with 22 additions and 13 deletions
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35
thermion_dart/lib/src/utils/src/image.dart
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@@ -42,15 +42,15 @@ Future<Uint8List> pixelBufferToBmp(Uint8List pixelBuffer, int width, int height,
final srcIndex = (y * width + x) * (hasAlpha ? 4 : 3); // RGBA format
final dstIndex = 54 + y * rowSize + x * 3; // BGR format
data[dstIndex] = isFloat
? (floatData![srcIndex + 2] * 255).toInt()
: pixelBuffer[srcIndex + 2]; // Blue
data[dstIndex + 1] = isFloat
? (floatData![srcIndex + 1] * 255).toInt()
: pixelBuffer[srcIndex + 1]; // Green
data[dstIndex + 2] = isFloat
? (floatData![srcIndex] * 255).toInt()
: pixelBuffer[srcIndex]; // Red
data[dstIndex] = isFloat
? (floatData![srcIndex + 2] * 255).toInt()
: pixelBuffer[srcIndex + 2]; // Blue
data[dstIndex + 1] = isFloat
? (floatData![srcIndex + 1] * 255).toInt()
: pixelBuffer[srcIndex + 1]; // Green
data[dstIndex + 2] = isFloat
? (floatData![srcIndex] * 255).toInt()
: pixelBuffer[srcIndex]; // Red
// Alpha channel is discarded
}
@@ -64,7 +64,11 @@ Future<Uint8List> pixelBufferToBmp(Uint8List pixelBuffer, int width, int height,
}
Future<Uint8List> pixelBufferToPng(Uint8List pixelBuffer, int width, int height,
{bool hasAlpha = true, bool isFloat = false, bool linearToSrgb = false, bool invertAces = false}) async {
{bool hasAlpha = true,
bool isFloat = false,
bool linearToSrgb = false,
bool invertAces = false,
bool flipY = false}) async {
final image = img.Image(width: width, height: height);
Float32List? floatData;
@@ -75,10 +79,15 @@ Future<Uint8List> pixelBufferToPng(Uint8List pixelBuffer, int width, int height,
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++) {
final int pixelIndex = (y * width + x) * (hasAlpha ? 4 : 3);
late int pixelIndex;
if (flipY) {
pixelIndex = ((height - 1 - y) * width + x) * (hasAlpha ? 4 : 3);
} else {
pixelIndex = (y * width + x) * (hasAlpha ? 4 : 3);
}
double r, g, b, a;
if (isFloat) {
r = floatData![pixelIndex];
g = floatData[pixelIndex + 1];