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optimize webp pixel copy by moving row chunks rather than pixels - refs #2024

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This commit is contained in:
Dane Springmeyer 2013-09-27 11:54:12 -07:00
parent a2f24e72bd
commit 44807673a3
1 changed files with 2 additions and 6 deletions
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8
include/mapnik/webp_io.hpp
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@ -74,18 +74,14 @@ inline int import_image_data(T2 const& image,
bool alpha)
{
// Reason for copy: https://github.com/mapnik/mapnik/issues/2024
// TODO - figure out way to pass view pixels directly to webp importer
image_data_32 im(image.width(),image.height());
int stride = sizeof(typename T2::pixel_type) * im.width();
for (unsigned y = 0; y < image.height(); ++y)
{
typename T2::pixel_type const * row_from = image.getRow(y);
image_data_32::pixel_type * row_to = im.getRow(y);
for (unsigned x = 0; x < image.width(); ++x)
{
row_to[x] = row_from[x];
}
std::memcpy(row_to,row_from,stride);
}
int stride = sizeof(typename T2::pixel_type) * im.width();
if (alpha)
{
return WebPPictureImportRGBA(&pic, im.getBytes(), stride);