


System.Drawing.Bitmap's Stride Parameter: A Deep Dive
The stride
parameter in the System.Drawing.Bitmap
constructor often causes confusion. This article explains why it must be a multiple of 4.
This requirement stems from older CPU architectures. For optimal performance, these CPUs processed bitmap data in 32-bit chunks. Alignment of each scan line's first byte to a 32-bit boundary (a multiple of 4) was crucial. Any misalignment necessitated extra CPU cycles for data reorganization.
Although modern CPUs favor cache line alignment, the multiple-of-4 stride
constraint remains for backward compatibility.
Stride Calculation
The correct stride
is calculated as follows:
int bitsPerPixel = ((int)format & 0xff00) >> 8; int bytesPerPixel = (bitsPerPixel + 7) / 8; int stride = 4 * ((width * bytesPerPixel + 3) / 4);
Substitute the image's format
and width
to obtain the appropriate stride
.
In Summary
Understanding the historical context of the stride
restriction is key to efficiently using the System.Drawing.Bitmap
constructor. A multiple-of-4 stride
ensures compatibility and performance optimization across various architectures.
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