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Add PixelBuffer#to_bytes for zero-overhead pixel access #2387

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Add PixelBuffer#to_bytes for zero-overhead pixel access #2387

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16 changes: 16 additions & 0 deletions src/gsi/gsi/gsiDeclTlPixelBuffer.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,14 @@ static std::vector<char> pixel_buffer_to_png (const tl::PixelBuffer *pb)
#endif
}

// Returns the raw ARGB32 pixel data as a byte vector (no encoding overhead)
static std::vector<char> pixel_buffer_to_bytes (const tl::PixelBuffer *pb)
{
const char *p = (const char *) pb->data ();
size_t n = (size_t) pb->width () * (size_t) pb->height () * 4;
return std::vector<char> (p, p + n);
}


Class<tl::PixelBuffer> decl_PixelBuffer ("lay", "PixelBuffer",
gsi::constructor ("new", &create_pixel_buffer, gsi::arg ("width"), gsi::arg ("height"),
Expand Down Expand Up @@ -188,6 +196,14 @@ Class<tl::PixelBuffer> decl_PixelBuffer ("lay", "PixelBuffer",
"\n"
"This method may not be available if PNG support is not compiled into KLayout."
) +
gsi::method_ext ("to_bytes", &pixel_buffer_to_bytes,
"@brief Converts the pixel buffer to a raw byte stream\n"
"\n"
"Returns the raw ARGB32 pixel data with 4 bytes per pixel in row-major order, "
"top to bottom. Unlike \\to_png_data this method has zero encoding overhead.\n"
"\n"
"This method has been added in version 0.30.9."
) +
gsi::method ("patch", &tl::PixelBuffer::patch, gsi::arg ("other"),
"@brief Patches another pixel buffer into this one\n"
"\n"
Expand Down