fabs/rotate-me-fast
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Set padding pixels to black.

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This commit is contained in:
Fabien Freling 2014-08-05 22:27:18 +02:00
parent b008cccb95
commit 085dc2861c
1 changed files with 22 additions and 2 deletions
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24
rotation.cpp
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@ -388,7 +388,20 @@ Image* rotate(Image const& src, double angle)
{ {
Point src_rotated_point = src_rotated_origin; Point src_rotated_point = src_rotated_origin;
for (int x = 0; x < width; ++x) int const left_padding = padding_table[y];
int const right_padding = padding_table[height - 1 - y];
int const core_pixels = width - left_padding - right_padding;
// Left padding
for (int x = 0; x < left_padding; ++x, ++buffer_index)
{
// Set to black value
buffer[buffer_index] = 0;
src_rotated_point += qdx;
}
// Body
for (int x = 0; x < core_pixels; ++x, ++buffer_index)
{ {
if (src_rotated_point.x >= 0 && src_rotated_point.x < src_qwidth if (src_rotated_point.x >= 0 && src_rotated_point.x < src_qwidth
&& src_rotated_point.y >= 0 && src_rotated_point.y < src_qheight) && src_rotated_point.y >= 0 && src_rotated_point.y < src_qheight)
@ -400,8 +413,15 @@ Image* rotate(Image const& src, double angle)
} }
src_rotated_point += qdx; src_rotated_point += qdx;
buffer_index += 1; // pixel_size
} }
// Right padding
for (int x = 0; x < right_padding; ++x, ++buffer_index)
{
// Set to black value
buffer[buffer_index] = 0;
}
src_rotated_origin += qdy; src_rotated_origin += qdy;
} }