mirror of
https://github.com/libretro/scummvm.git
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130 lines
4.0 KiB
C++
130 lines
4.0 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "graphics/scalerplugin.h"
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namespace {
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/**
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* Trivial 'scaler' - in fact it doesn't do any scaling but just copies the
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* source to the destination.
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*/
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template<typename Pixel>
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void Normal1x(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch,
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int width, int height) {
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// Spot the case when it can all be done in 1 hit
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int BytesPerPixel = sizeof(Pixel);
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if ((srcPitch == BytesPerPixel * (uint)width) && (dstPitch == BytesPerPixel * (uint)width)) {
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memcpy(dstPtr, srcPtr, BytesPerPixel * width * height);
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return;
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}
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while (height--) {
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memcpy(dstPtr, srcPtr, BytesPerPixel * width);
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srcPtr += srcPitch;
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dstPtr += dstPitch;
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}
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}
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} // End of anonymous namespace
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void Scaler::scale(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr,
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uint32 dstPitch, int width, int height, int x, int y) {
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if (_factor == 1) {
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if (_format.bytesPerPixel == 2) {
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Normal1x<uint16>(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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} else {
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Normal1x<uint32>(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
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}
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} else {
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scaleIntern(srcPtr, srcPitch, dstPtr, dstPitch, width, height, x, y);
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}
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}
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SourceScaler::SourceScaler(const Graphics::PixelFormat &format) : Scaler(format), _width(0), _height(0), _oldSrc(NULL), _enable(false) {
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}
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SourceScaler::~SourceScaler() {
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if (_oldSrc != NULL)
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delete[] _oldSrc;
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_bufferedOutput.free();
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}
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void SourceScaler::setSource(const byte *src, uint pitch, int width, int height, int padding) {
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if (_oldSrc != NULL)
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delete[] _oldSrc;
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_width = width;
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_height = height;
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_padding = padding;
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// Give _oldSrc same pitch
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int size = (height + padding * 2) * pitch;
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_oldSrc = new byte[size]();
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_bufferedOutput.create(_width * _factor, _height * _factor, _format);
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}
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uint SourceScaler::setFactor(uint factor) {
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uint oldFactor = _factor;
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_factor = factor;
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if (factor != oldFactor && _width != 0 && _height != 0) {
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_bufferedOutput.create(_width * _factor, _height * _factor, _format);
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}
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return oldFactor;
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}
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void SourceScaler::scaleIntern(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr,
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uint32 dstPitch, int width, int height, int x, int y) {
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if (!_enable) {
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// Do not pass _oldSrc, do not update _oldSrc
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internScale(srcPtr, srcPitch,
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dstPtr, dstPitch,
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NULL, 0,
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width, height,
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NULL, 0);
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return;
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}
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int offset = (_padding + x) * _format.bytesPerPixel + (_padding + y) * srcPitch;
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// Call user defined scale function
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internScale(srcPtr, srcPitch,
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dstPtr, dstPitch,
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_oldSrc + offset, srcPitch,
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width, height,
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(uint8 *)_bufferedOutput.getBasePtr(x * _factor, y * _factor), _bufferedOutput.pitch);
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// Update the destination buffer
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byte *buffer = (byte *)_bufferedOutput.getBasePtr(x * _factor, y * _factor);
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for (uint i = 0; i < height * _factor; ++i) {
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memcpy(buffer, dstPtr, width * _factor * _format.bytesPerPixel);
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buffer += _bufferedOutput.pitch;
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dstPtr += dstPitch;
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}
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// Update old src
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byte *oldSrc = _oldSrc + offset;
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while (height--) {
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memcpy(oldSrc, srcPtr, width * _format.bytesPerPixel);
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oldSrc += srcPitch;
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srcPtr += srcPitch;
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}
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}
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