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/*
* Copyright (c) 2002 Patrick Julien <freak@codepimps.org>
*
* 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.
*
* this program is distributed in the hope that it will be useful,
* but without any warranty; without even the implied warranty of
* merchantability or fitness for a particular purpose. see the
* gnu general public license for more details.
*
* you should have received a copy of the gnu general public license
* along with this program; if not, write to the free software
* foundation, inc., 675 mass ave, cambridge, ma 02139, usa.
*/
#include "kis_global.h"
#include "kis_background.h"
#include "kis_integer_maths.h"
KisBackground::KisBackground()
: KShared()
{
m_patternTile = TQImage(PATTERN_WIDTH, PATTERN_HEIGHT, 32);
m_patternTile.setAlphaBuffer(false);
for (int y = 0; y < PATTERN_HEIGHT; y++)
{
for (int x = 0; x < PATTERN_WIDTH; x++)
{
TQ_UINT8 v = 128 + 63 * ((x / 16 + y / 16) % 2);
m_patternTile.setPixel(x, y, tqRgb(v, v, v));
}
}
}
KisBackground::~KisBackground()
{
}
const TQImage& KisBackground::patternTile() const
{
return m_patternTile;
}
void KisBackground::paintBackground(TQImage image, int imageLeftX, int imageTopY)
{
int patternLeftX;
if (imageLeftX >= 0) {
patternLeftX = imageLeftX % PATTERN_WIDTH;
} else {
patternLeftX = (PATTERN_WIDTH - (-imageLeftX % PATTERN_WIDTH)) % PATTERN_WIDTH;
}
int patternTopY;
if (imageTopY >= 0) {
patternTopY = imageTopY % PATTERN_HEIGHT;
} else {
patternTopY = (PATTERN_HEIGHT - (-imageTopY % PATTERN_HEIGHT)) % PATTERN_HEIGHT;
}
int imageWidth = image.width();
int imageHeight = image.height();
int patternY = patternTopY;
for (int y = 0; y < imageHeight; y++)
{
TQRgb *imagePixelPtr = reinterpret_cast<TQRgb *>(image.scanLine(y));
const TQRgb *patternScanLine = reinterpret_cast<const TQRgb *>(m_patternTile.scanLine(patternY));
int patternX = patternLeftX;
for (int x = 0; x < imageWidth; x++)
{
TQRgb imagePixel = *imagePixelPtr;
TQ_UINT8 imagePixelAlpha = tqAlpha(imagePixel);
if (imagePixelAlpha != 255) {
TQRgb patternPixel = patternScanLine[patternX];
TQ_UINT8 imageRed = UINT8_BLEND(tqRed(imagePixel), tqRed(patternPixel), imagePixelAlpha);
TQ_UINT8 imageGreen = UINT8_BLEND(tqGreen(imagePixel), tqGreen(patternPixel), imagePixelAlpha);
TQ_UINT8 imageBlue = UINT8_BLEND(tqBlue(imagePixel), tqBlue(patternPixel), imagePixelAlpha);
*imagePixelPtr = tqRgba(imageRed, imageGreen, imageBlue, 255);
}
++imagePixelPtr;
++patternX;
if (patternX == PATTERN_WIDTH) {
patternX = 0;
}
}
++patternY;
if (patternY == PATTERN_HEIGHT) {
patternY = 0;
}
}
}
void KisBackground::paintBackground(TQImage img, const TQRect& scaledImageRect, const TQSize& scaledImageSize, const TQSize& imageSize)
{
if (scaledImageRect.isEmpty() || scaledImageSize.isEmpty() || imageSize.isEmpty()) {
return;
}
Q_ASSERT(img.size() == scaledImageRect.size());
if (img.size() != scaledImageRect.size()) {
return;
}
TQ_INT32 imageWidth = imageSize.width();
TQ_INT32 imageHeight = imageSize.height();
for (TQ_INT32 y = 0; y < scaledImageRect.height(); ++y) {
TQ_INT32 scaledY = scaledImageRect.y() + y;
TQ_INT32 srcY = (scaledY * imageHeight) / scaledImageSize.height();
TQ_INT32 patternY = srcY % PATTERN_HEIGHT;
TQRgb *imagePixelPtr = reinterpret_cast<TQRgb *>(img.scanLine(y));
const TQRgb *patternScanLine = reinterpret_cast<const TQRgb *>(m_patternTile.scanLine(patternY));
for (TQ_INT32 x = 0; x < scaledImageRect.width(); ++x) {
TQRgb imagePixel = *imagePixelPtr;
TQ_UINT8 imagePixelAlpha = tqAlpha(imagePixel);
if (imagePixelAlpha != 255) {
TQ_INT32 scaledX = scaledImageRect.x() + x;
TQ_INT32 srcX = (scaledX * imageWidth) / scaledImageSize.width();
TQ_INT32 patternX = srcX % PATTERN_WIDTH;
TQRgb patternPixel = patternScanLine[patternX];
TQ_UINT8 imageRed = UINT8_BLEND(tqRed(imagePixel), tqRed(patternPixel), imagePixelAlpha);
TQ_UINT8 imageGreen = UINT8_BLEND(tqGreen(imagePixel), tqGreen(patternPixel), imagePixelAlpha);
TQ_UINT8 imageBlue = UINT8_BLEND(tqBlue(imagePixel), tqBlue(patternPixel), imagePixelAlpha);
*imagePixelPtr = tqRgba(imageRed, imageGreen, imageBlue, 255);
}
++imagePixelPtr;
}
}
}
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