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Add PixelBuffer#to_bytes for zero-overhead RGBA pixel access 

Exposes a GSI method on tl::PixelBuffer that returns the raw ARGB32
contents as a byte vector (4 bytes per pixel, row-major, top to bottom)
via a single memcpy. Unlike to_png_data this skips all image encoding,
which is useful when the caller just wants direct pixel data.
This commit is contained in:
Kirill Osipov 2026-06-30 17:08:18 +02:00
parent d352db146f
commit 35ec1107b6
1 changed files with 16 additions and 0 deletions
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16
src/gsi/gsi/gsiDeclTlPixelBuffer.cc
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@ -126,6 +126,14 @@ static std::vector<char> pixel_buffer_to_png (const tl::PixelBuffer *pb)
#endif #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", Class<tl::PixelBuffer> decl_PixelBuffer ("lay", "PixelBuffer",
gsi::constructor ("new", &create_pixel_buffer, gsi::arg ("width"), gsi::arg ("height"), gsi::constructor ("new", &create_pixel_buffer, gsi::arg ("width"), gsi::arg ("height"),
@ -188,6 +196,14 @@ Class<tl::PixelBuffer> decl_PixelBuffer ("lay", "PixelBuffer",
"\n" "\n"
"This method may not be available if PNG support is not compiled into KLayout." "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"), gsi::method ("patch", &tl::PixelBuffer::patch, gsi::arg ("other"),
"@brief Patches another pixel buffer into this one\n" "@brief Patches another pixel buffer into this one\n"
"\n" "\n"