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rotate-me-fast
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Patch border to have at least one pixel. 

We check that we have a border of at least 1 pixel in 8-neighborhood.
master
Fabien Freling 2014-08-05 23:47:39 +02:00
parent 7f1bd27ac0
commit df00295cd1
1 changed files with 20 additions and 24 deletions
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44
rotation.cpp
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@ -279,6 +279,7 @@ void print_padding_table(uint16_t const* padding_table,
//
// Border
//
uint16_t* generate_border_table(uint16_t const* padding_table, int size)
{
uint16_t* border_table = new uint16_t[size];
@ -286,26 +287,31 @@ uint16_t* generate_border_table(uint16_t const* padding_table, int size)
for (int i = 1; i < size - 1; ++i)
{
border_table[i] = max(1, abs(padding_table[i - 1] - padding_table[i]));
if (padding_table[i - 1] > padding_table[i])
{
border_table[i] = padding_table[i - 1] - padding_table[i];
if (padding_table[i - 1] != padding_table[i])
border_table[i] += 1;
}
else
{
border_table[i] = 1;
if (padding_table[i - 1] != padding_table[i])
border_table[i - 1] += 1;
}
}
for (int i = size / 2; i < size - 1; ++i)
// Check that we don't add too much border
for (int i = 1; i < size - 1; ++i)
{
if (padding_table[i] + border_table[i]
+ border_table[size - 1 - i] + padding_table[size - 1 - i] > size)
+ padding_table[size - 1 - i] + border_table[size - 1 - i]
> size)
{
border_table[i] -= 1;
}
}
if (padding_table[0] + padding_table[size - 1] > size)
{
cout << "Too many padding pixels." << endl;
cout << " padding_table[0] = " << padding_table[0] << endl;;
cout << " padding_table[size - 1] = " << padding_table[size - 1] << endl;;
cout << " size = " << size << endl;;
abort();
}
border_table[size - 1] = size - padding_table[0] - padding_table[size - 1];
return border_table;
@ -419,9 +425,6 @@ Image* rotate(Image const& src, double angle)
unsigned int buffer_index = 0;
pvalue_t* buffer = rotated->buffer;
int64_t const src_qwidth = (int64_t) src.width * q_pos;
int64_t const src_qheight = (int64_t) src.height * q_pos;
unsigned int const src_limit = src.width * src.height * src.pixel_size;
int const width = rotated->width;
int const height = rotated->height;
@ -437,11 +440,12 @@ Image* rotate(Image const& src, double angle)
{
Point src_rotated_point = src_rotated_origin;
// TODO: compact these structure to increase locality
int const left_padding = padding_table[y];
int const left_border = border_table[y];
int const right_padding = padding_table[height - 1 - y];
int const right_border = border_table[height - 1 - y];
int const core_pixels = height - left_padding - left_border - right_border - right_padding;
int const core_pixels = width - left_padding - left_border - right_border - right_padding;
// Left padding
for (int x = 0; x < left_padding; ++x, ++buffer_index)
@ -461,15 +465,7 @@ Image* rotate(Image const& src, double angle)
// Body
for (int x = 0; x < core_pixels; ++x, ++buffer_index)
{
if (src_rotated_point.x >= 0 && src_rotated_point.x < src_qwidth
&& src_rotated_point.y >= 0 && src_rotated_point.y < src_qheight)
{
rotate_pixel(src, src_rotated_point,
src_limit,
buffer, buffer_index,
q_pos_pow);
}
rotate_pixel(src, src_rotated_point, src_limit, buffer, buffer_index, q_pos_pow);
src_rotated_point += qdx;
}