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Small optimization of PixelAttributes.

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This commit is contained in:
Miroslav Bendík
2012-09-01 14:36:14 +02:00
parent 1edbba5a94
commit 4a8c041bc1
3 changed files with 45 additions and 11 deletions
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37
PixelAttributes.cpp
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@ -7,28 +7,49 @@
* =====================================================================
*/
#include <cstdlib>
#include <cstring>
#include "PixelAttributes.h"
#include <algorithm>
using namespace std;
PixelAttributes::PixelAttributes()
PixelAttributes::PixelAttributes():
m_width(0)
{
m_blockPixelAttributes.resize(17); // 16px + 1px gradient calculation
for (size_t i = 0; i < BlockCount; ++i) {
m_pixelAttributes[i] = 0;
}
}
PixelAttributes::~PixelAttributes()
{
freeAttributes();
}
void PixelAttributes::setWidth(int width)
{
for (size_t i = 0; i < 17; ++i) {
m_blockPixelAttributes[i].resize(width + 2); // Width + 1 px gradient calculation on both sides
freeAttributes();
m_width = width;
for (size_t i = 0; i < BlockCount; ++i) {
m_pixelAttributes[i] = new PixelAttribute[m_width + 1];
}
}
void PixelAttributes::scroll()
{
m_blockPixelAttributes[0] = m_blockPixelAttributes[16];
for (size_t i = 1; i < 17; ++i) {
fill(m_blockPixelAttributes[i].begin(), m_blockPixelAttributes[i].end(), PixelAttribute());
memcpy(m_pixelAttributes[FirstLine], m_pixelAttributes[LastLine], (m_width + 1) * sizeof(PixelAttribute));
for (size_t i = 1; i < BlockCount - 1; ++i) {
memcpy(m_pixelAttributes[i], m_pixelAttributes[EmptyLine], (m_width + 1) * sizeof(PixelAttribute));
}
}
void PixelAttributes::freeAttributes()
{
for (size_t i = 0; i < BlockCount; ++i) {
if (m_pixelAttributes[i] != 0) {
delete[] m_pixelAttributes[i];
m_pixelAttributes[i] = 0;
}
}
}