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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version. See the file
COPYING included with this distribution for more information.
*/
#include "ScrollableImageCache.h"
#include "base/HitCount.h"
#include "base/Debug.h"
#include <iostream>
using namespace std;
//#define DEBUG_SCROLLABLE_IMAGE_CACHE 1
namespace sv {
ScrollableImageCache::ScrollableImageCache() :
m_validLeft(0),
m_validWidth(0),
m_startFrame(0)
{
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]::ScrollableImageCache" << endl;
#endif
}
ScrollableImageCache::~ScrollableImageCache()
{
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]::~ScrollableImageCache" << endl;
#endif
}
void
ScrollableImageCache::invalidate()
{
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]::invalidate" << endl;
#endif
m_validWidth = 0;
}
void
ScrollableImageCache::scrollTo(const LayerGeometryProvider *v,
sv_frame_t newStartFrame)
{
static HitCount count("ScrollableImageCache: scrolling");
int dx = (v->getXForFrame(m_startFrame) -
v->getXForFrame(newStartFrame));
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]::scrollTo: start frame " << m_startFrame
<< " -> " << newStartFrame << ", dx = " << dx << endl;
#endif
if (m_startFrame == newStartFrame) {
// haven't moved
count.hit();
return;
}
m_startFrame = newStartFrame;
if (!isValid()) {
count.miss();
return;
}
int w = m_image.width();
if (dx == 0) {
// haven't moved visibly (even though start frame may have changed)
count.hit();
return;
}
if (dx <= -w || dx >= w) {
// scrolled entirely off
invalidate();
count.miss();
return;
}
count.partial();
// dx is in range, cache is scrollable
int dxp = dx;
if (dxp < 0) dxp = -dxp;
int copylen = (w - dxp) * int(sizeof(QRgb));
for (int y = 0; y < m_image.height(); ++y) {
QRgb *line = (QRgb *)m_image.scanLine(y);
if (dx < 0) {
memmove(line, line + dxp, copylen);
} else {
memmove(line + dxp, line, copylen);
}
}
// update valid area
int px = m_validLeft;
int pw = m_validWidth;
px += dx;
if (dx < 0) {
// we scrolled left
if (px < 0) {
pw += px;
px = 0;
if (pw < 0) {
pw = 0;
}
}
} else {
// we scrolled right
if (px + pw > w) {
pw = w - px;
if (pw < 0) {
pw = 0;
}
}
}
m_validLeft = px;
m_validWidth = pw;
}
void
ScrollableImageCache::adjustToTouchValidArea(int &left, int &width,
bool &isLeftOfValidArea) const
{
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]::adjustToTouchValidArea: left " << left
<< ", width " << width << endl;
SVCERR << "ScrollableImageCache[" << this << "]: my left " << m_validLeft
<< ", width " << m_validWidth << " so right " << (m_validLeft + m_validWidth) << endl;
#endif
if (left < m_validLeft) {
isLeftOfValidArea = true;
if (left + width <= m_validLeft + m_validWidth) {
width = m_validLeft - left;
}
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]: we're left of valid area, adjusted width to " << width << endl;
#endif
} else {
isLeftOfValidArea = false;
width = left + width - (m_validLeft + m_validWidth);
left = m_validLeft + m_validWidth;
if (width < 0) width = 0;
#ifdef DEBUG_SCROLLABLE_IMAGE_CACHE
SVCERR << "ScrollableImageCache[" << this << "]: we're right of valid area, adjusted left to " << left << ", width to " << width << endl;
#endif
}
}
void
ScrollableImageCache::drawImage(int left,
int width,
QImage image,
int imageLeft,
int imageWidth)
{
if (image.height() != m_image.height()) {
SVCERR << "ScrollableImageCache[" << this << "]::drawImage: ERROR: Supplied image height "
<< image.height() << " does not match cache height "
<< m_image.height() << endl;
throw std::logic_error("Image height must match cache height in ScrollableImageCache::drawImage");
}
if (left < 0 || width < 0 || left + width > m_image.width()) {
SVCERR << "ScrollableImageCache[" << this << "]::drawImage: ERROR: Target area (left = "
<< left << ", width = " << width << ", so right = " << left + width
<< ") out of bounds for cache of width " << m_image.width() << endl;
throw std::logic_error("Target area out of bounds in ScrollableImageCache::drawImage");
}
if (imageLeft < 0 || imageWidth < 0 ||
imageLeft + imageWidth > image.width()) {
SVCERR << "ScrollableImageCache[" << this << "]::drawImage: ERROR: Source area (left = "
<< imageLeft << ", width = " << imageWidth << ", so right = "
<< imageLeft + imageWidth << ") out of bounds for image of "
<< "width " << image.width() << endl;
throw std::logic_error("Source area out of bounds in ScrollableImageCache::drawImage");
}
QPainter painter(&m_image);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.drawImage(QRect(left, 0, width, m_image.height()),
image,
QRect(imageLeft, 0, imageWidth, image.height()));
painter.end();
if (!isValid()) {
m_validLeft = left;
m_validWidth = width;
return;
}
if (left < m_validLeft) {
if (left + width > m_validLeft + m_validWidth) {
// new image completely contains the old valid area --
// use the new area as is
m_validLeft = left;
m_validWidth = width;
} else if (left + width < m_validLeft) {
// new image completely off left of old valid area --
// we can't extend the valid area because the bit in
// between is not valid, so must use the new area only
m_validLeft = left;
m_validWidth = width;
} else {
// new image overlaps old valid area on left side --
// use new left edge, and extend width to existing
// right edge
m_validWidth = (m_validLeft + m_validWidth) - left;
m_validLeft = left;
}
} else {
if (left > m_validLeft + m_validWidth) {
// new image completely off right of old valid area --
// we can't extend the valid area because the bit in
// between is not valid, so must use the new area only
m_validLeft = left;
m_validWidth = width;
} else if (left + width > m_validLeft + m_validWidth) {
// new image overlaps old valid area on right side --
// use existing left edge, and extend width to new
// right edge
m_validWidth = (left + width) - m_validLeft;
// (m_validLeft unchanged)
} else {
// new image completely contained within old valid
// area -- leave the old area unchanged
}
}
}
} // end namespace sv
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