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-rw-r--r--core/fxge/dib/cfx_dibsource.cpp10
1 files changed, 6 insertions, 4 deletions
diff --git a/core/fxge/dib/cfx_dibsource.cpp b/core/fxge/dib/cfx_dibsource.cpp
index a0ed95055b..3a2179660f 100644
--- a/core/fxge/dib/cfx_dibsource.cpp
+++ b/core/fxge/dib/cfx_dibsource.cpp
@@ -271,12 +271,14 @@ void ConvertBuffer_IndexCopy(uint8_t* dest_buf,
if (pSrcBitmap->GetBPP() == 1) {
for (int row = 0; row < height; row++) {
uint8_t* dest_scan = dest_buf + row * dest_pitch;
- memset(dest_scan, 0, width);
+ // Set all destination pixels to be white initially.
+ memset(dest_scan, 255, width);
const uint8_t* src_scan = pSrcBitmap->GetScanline(src_top + row);
for (int col = src_left; col < src_left + width; col++) {
- if (src_scan[col / 8] & (1 << (7 - col % 8))) {
- *dest_scan = 1;
- }
+ // If the source bit is set, then set the destination pixel to be black.
+ if (src_scan[col / 8] & (1 << (7 - col % 8)))
+ *dest_scan = 0;
+
dest_scan++;
}
}