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pnmimagetypes: fix allocation efficiency in PNG reader

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Rather than making one allocation per row, it instead makes one allocation for all rows.
This commit is contained in:
rdb 2018-12-30 20:10:50 +01:00
parent 62781c154b
commit 42405dff2e
1 changed files with 4 additions and 5 deletions
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9
panda/src/pnmimagetypes/pnmFileTypePNG.cxx
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@ -338,11 +338,12 @@ read_data(xel *array, xelval *alpha_data) {
// format, mainly because we keep array and alpha data separately, and there
// doesn't appear to be good support to get this stuff out row-at-a-time for
// interlaced files.
png_bytep *rows = (png_bytep *)PANDA_MALLOC_ARRAY(num_rows * sizeof(png_bytep));
png_bytep *rows = (png_bytep *)alloca(num_rows * sizeof(png_bytep));
int yi;
png_byte *alloc = (png_byte *)PANDA_MALLOC_ARRAY(row_byte_length * sizeof(png_byte) * num_rows);
for (yi = 0; yi < num_rows; yi++) {
rows[yi] = (png_byte *)PANDA_MALLOC_ARRAY(row_byte_length * sizeof(png_byte));
rows[yi] = alloc + (row_byte_length * sizeof(png_byte)) * yi;
}
png_read_image(_png, rows);
@ -402,12 +403,10 @@ read_data(xel *array, xelval *alpha_data) {
}
nassertr(source <= rows[yi] + row_byte_length, yi);
PANDA_FREE_ARRAY(rows[yi]);
}
PANDA_FREE_ARRAY(rows);
png_read_end(_png, nullptr);
PANDA_FREE_ARRAY(alloc);
return _y_size;
}