scummvm/graphics/managed_surface.cpp

342 lines
12 KiB
C++

/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "graphics/managed_surface.h"
#include "common/algorithm.h"
#include "common/textconsole.h"
namespace Graphics {
const int SCALE_THRESHOLD = 0x100;
ManagedSurface::ManagedSurface() :
w(_innerSurface.w), h(_innerSurface.h), pitch(_innerSurface.pitch), format(_innerSurface.format),
_disposeAfterUse(DisposeAfterUse::NO), _owner(nullptr) {
}
ManagedSurface::ManagedSurface(ManagedSurface &surf) :
w(_innerSurface.w), h(_innerSurface.h), pitch(_innerSurface.pitch), format(_innerSurface.format),
_disposeAfterUse(DisposeAfterUse::NO), _owner(nullptr) {
*this = surf;
}
ManagedSurface::ManagedSurface(int width, int height) :
w(_innerSurface.w), h(_innerSurface.h), pitch(_innerSurface.pitch), format(_innerSurface.format),
_disposeAfterUse(DisposeAfterUse::NO), _owner(nullptr) {
create(width, height);
}
ManagedSurface::ManagedSurface(int width, int height, const Graphics::PixelFormat &pixelFormat) :
w(_innerSurface.w), h(_innerSurface.h), pitch(_innerSurface.pitch), format(_innerSurface.format),
_disposeAfterUse(DisposeAfterUse::NO), _owner(nullptr) {
create(width, height, pixelFormat);
}
ManagedSurface::ManagedSurface(ManagedSurface &surf, const Common::Rect &bounds) :
w(_innerSurface.w), h(_innerSurface.h), pitch(_innerSurface.pitch), format(_innerSurface.format),
_disposeAfterUse(DisposeAfterUse::NO), _owner(nullptr) {
create(surf, bounds);
}
ManagedSurface::~ManagedSurface() {
free();
}
ManagedSurface &ManagedSurface::operator=(ManagedSurface &surf) {
// Free any current surface
free();
if (surf._disposeAfterUse == DisposeAfterUse::YES) {
// Create a new surface and copy the pixels from the source surface
create(surf.w, surf.h, surf.format);
Common::copy((const byte *)surf.getPixels(), (const byte *)surf.getPixels() +
surf.w * surf.h * surf.format.bytesPerPixel, (byte *)this->getPixels());
} else {
// Source isn't managed, so simply copy its fields
_owner = surf._owner;
_offsetFromOwner = surf._offsetFromOwner;
void *srcPixels = surf._innerSurface.getPixels();
_innerSurface.setPixels(srcPixels);
_innerSurface.w = surf.w;
_innerSurface.h = surf.h;
_innerSurface.pitch = surf.pitch;
this->format = surf.format;
}
return *this;
}
void ManagedSurface::setPixels(void *newPixels) {
free();
_innerSurface.setPixels(newPixels);
}
void ManagedSurface::create(uint16 width, uint16 height) {
create(width, height, PixelFormat::createFormatCLUT8());
}
void ManagedSurface::create(uint16 width, uint16 height, const PixelFormat &pixelFormat) {
free();
_innerSurface.create(width, height, pixelFormat);
_disposeAfterUse = DisposeAfterUse::YES;
markAllDirty();
}
void ManagedSurface::create(ManagedSurface &surf, const Common::Rect &bounds) {
free();
_offsetFromOwner = Common::Point(bounds.left, bounds.top);
_innerSurface.setPixels(surf.getBasePtr(bounds.left, bounds.top));
_innerSurface.pitch = surf.pitch;
_innerSurface.format = surf.format;
_innerSurface.w = bounds.width();
_innerSurface.h = bounds.height();
_owner = &surf;
_disposeAfterUse = DisposeAfterUse::NO;
}
void ManagedSurface::free() {
if (_disposeAfterUse == DisposeAfterUse::YES)
_innerSurface.free();
_disposeAfterUse = DisposeAfterUse::NO;
_owner = nullptr;
_offsetFromOwner = Common::Point(0, 0);
}
bool ManagedSurface::clip(Common::Rect &srcBounds, Common::Rect &destBounds) {
if (destBounds.left >= this->w || destBounds.top >= this->h ||
destBounds.right <= 0 || destBounds.bottom <= 0)
return false;
// Clip the bounds if necessary to fit on-screen
if (destBounds.right > this->w) {
srcBounds.right -= destBounds.right - this->w;
destBounds.right = this->w;
}
if (destBounds.bottom > this->h) {
srcBounds.bottom -= destBounds.bottom - this->h;
destBounds.bottom = this->h;
}
if (destBounds.top < 0) {
srcBounds.top += -destBounds.top;
destBounds.top = 0;
}
if (destBounds.left < 0) {
srcBounds.left += -destBounds.left;
destBounds.left = 0;
}
return true;
}
void ManagedSurface::blitFrom(const Surface &src) {
blitFrom(src, Common::Rect(0, 0, src.w, src.h), Common::Point(0, 0));
}
void ManagedSurface::blitFrom(const Surface &src, const Common::Point &destPos) {
blitFrom(src, Common::Rect(0, 0, src.w, src.h), destPos);
}
void ManagedSurface::blitFrom(const Surface &src, const Common::Rect &srcRect,
const Common::Point &destPos) {
Common::Rect srcBounds = srcRect;
Common::Rect destBounds(destPos.x, destPos.y, destPos.x + srcRect.width(),
destPos.y + srcRect.height());
uint destPixel;
byte rSrc, gSrc, bSrc, aSrc;
byte rDest, gDest, bDest;
double alpha;
if (!srcRect.isValidRect() || !clip(srcBounds, destBounds))
return;
if (format != src.format) {
// When the pixel format differs, both source an dest must be
// 2 or 4 bytes per pixel
assert(format.bytesPerPixel == 2 || format.bytesPerPixel == 4);
assert(src.format.bytesPerPixel == 2 || src.format.bytesPerPixel == 4);
}
for (int y = 0; y < srcBounds.height(); ++y) {
const byte *srcP = (const byte *)src.getBasePtr(srcBounds.left, srcBounds.top + y);
byte *destP = (byte *)getBasePtr(destBounds.left, destBounds.top + y);
if (src.format == format) {
// Matching surface formats, so we can do a straight copy
Common::copy(srcP, srcP + srcBounds.width() * format.bytesPerPixel, destP);
} else {
for (int x = 0; x < srcBounds.width(); ++x,
srcP += src.format.bytesPerPixel,
destP += format.bytesPerPixel) {
src.format.colorToARGB(src.format.bytesPerPixel == 2 ? *(const uint16 *)srcP : *(const uint32 *)srcP,
aSrc, rSrc, gSrc, bSrc);
format.colorToRGB(format.bytesPerPixel == 2 ? *(const uint16 *)destP : *(const uint32 *)destP,
rDest, gDest, bDest);
if (aSrc == 0) {
// Completely transparent, so skip
continue;
} else if (aSrc == 0xff) {
// Completely opaque, so copy RGB values over
rDest = rSrc;
gDest = gSrc;
bDest = bSrc;
} else {
// Partially transparent, so calculate new pixel colors
alpha = (double)aSrc / 255.0;
rDest = static_cast<byte>((rSrc * alpha) + (rDest * (1.0 - alpha)));
gDest = static_cast<byte>((gSrc * alpha) + (gDest * (1.0 - alpha)));
bDest = static_cast<byte>((bSrc * alpha) + (bDest * (1.0 - alpha)));
}
destPixel = format.ARGBToColor(0xff, rDest, gDest, bDest);
if (format.bytesPerPixel == 2)
*(uint16 *)destP = destPixel;
else
*(uint32 *)destP = destPixel;
}
}
}
addDirtyRect(Common::Rect(0, 0, this->w, this->h));
}
void ManagedSurface::transBlitFrom(const Surface &src, uint transColor, bool flipped, uint overrideColor) {
transBlitFrom(src, Common::Rect(0, 0, src.w, src.h), Common::Rect(0, 0, this->w, this->h),
transColor, false, overrideColor);
}
void ManagedSurface::transBlitFrom(const Surface &src, const Common::Point &destPos,
uint transColor, bool flipped, uint overrideColor) {
transBlitFrom(src, Common::Rect(0, 0, src.w, src.h), Common::Rect(destPos.x, destPos.y,
destPos.x + src.w, destPos.y + src.h), transColor, false, overrideColor);
}
void ManagedSurface::transBlitFrom(const Surface &src, const Common::Rect &srcRect,
const Common::Point &destPos, uint transColor, bool flipped, uint overrideColor) {
transBlitFrom(src, srcRect, Common::Rect(destPos.x, destPos.y,
destPos.x + src.w, destPos.y + src.h), transColor, false, overrideColor);
}
template<typename TSRC, typename TDEST>
void transBlit(const Surface &src, const Common::Rect &srcRect, Surface &dest, const Common::Rect &destRect, TSRC transColor, bool flipped, uint overrideColor) {
int scaleX = SCALE_THRESHOLD * srcRect.width() / destRect.width();
int scaleY = SCALE_THRESHOLD * srcRect.height() / destRect.height();
const Graphics::PixelFormat &srcFormat = src.format;
const Graphics::PixelFormat &destFormat = dest.format;
byte aSrc, rSrc, gSrc, bSrc;
byte rDest, gDest, bDest;
double alpha;
// Loop through drawing output lines
for (int destY = destRect.top, scaleYCtr = 0; destY < destRect.bottom; ++destY, scaleYCtr += scaleY) {
if (destY < 0 || destY >= dest.h)
continue;
const TSRC *srcLine = (const TSRC *)src.getBasePtr(srcRect.left, scaleYCtr / SCALE_THRESHOLD + srcRect.top);
TDEST *destLine = (TDEST *)dest.getBasePtr(destRect.left, destY);
// Loop through drawing the pixels of the row
for (int destX = destRect.left, xCtr = 0, scaleXCtr = 0; destX < destRect.right; ++destX, ++xCtr, scaleXCtr += scaleX) {
if (destX < 0 || destX >= dest.w)
continue;
TSRC srcVal = srcLine[flipped ? src.w - scaleXCtr / SCALE_THRESHOLD - 1 : scaleXCtr / SCALE_THRESHOLD];
if (srcVal == transColor)
continue;
if (srcFormat == destFormat) {
// Matching formats, so we can do a straight copy
destLine[xCtr] = overrideColor ? overrideColor : srcVal;
} else {
// Otherwise we have to manually decode and re-encode each pixel
srcFormat.colorToARGB(*srcLine, aSrc, rSrc, gSrc, bSrc);
destFormat.colorToRGB(destLine[xCtr], rDest, gDest, bDest);
if (aSrc == 0) {
// Completely transparent, so skip
continue;
} else if (aSrc == 0xff) {
// Completely opaque, so copy RGB values over
rDest = rSrc;
gDest = gSrc;
bDest = bSrc;
} else {
// Partially transparent, so calculate new pixel colors
alpha = (double)aSrc / 255.0;
rDest = static_cast<byte>((rSrc * alpha) + (rDest * (1.0 - alpha)));
gDest = static_cast<byte>((gSrc * alpha) + (gDest * (1.0 - alpha)));
bDest = static_cast<byte>((bSrc * alpha) + (bDest * (1.0 - alpha)));
}
destLine[xCtr] = destFormat.ARGBToColor(0xff, rDest, gDest, bDest);
}
}
}
}
#define HANDLE_BLIT(SRC_BYTES, DEST_BYTES, SRC_TYPE, DEST_TYPE) \
if (src.format.bytesPerPixel == SRC_BYTES && format.bytesPerPixel == DEST_BYTES) \
transBlit<SRC_TYPE, DEST_TYPE>(src, srcRect, _innerSurface, destRect, transColor, flipped, overrideColor); \
else
void ManagedSurface::transBlitFrom(const Surface &src, const Common::Rect &srcRect,
const Common::Rect &destRect, uint transColor, bool flipped, uint overrideColor) {
if (src.w == 0 || src.h == 0 || destRect.width() == 0 || destRect.height() == 0)
return;
HANDLE_BLIT(1, 1, byte, byte)
HANDLE_BLIT(2, 2, uint16, uint16)
HANDLE_BLIT(4, 4, uint32, uint32)
HANDLE_BLIT(2, 4, uint16, uint32)
HANDLE_BLIT(4, 2, uint32, uint16)
error("Surface::transBlitFrom: bytesPerPixel must be 1, 2, or 4");
// Mark the affected area
addDirtyRect(destRect);
}
#undef HANDLE_BLIT
void ManagedSurface::markAllDirty() {
addDirtyRect(Common::Rect(0, 0, this->w, this->h));
}
void ManagedSurface::addDirtyRect(const Common::Rect &r) {
if (_owner) {
Common::Rect bounds = r;
bounds.clip(Common::Rect(0, 0, this->w, this->h));
bounds.translate(_offsetFromOwner.x, _offsetFromOwner.y);
_owner->addDirtyRect(bounds);
}
}
void ManagedSurface::clear(uint color) {
fillRect(getBounds(), color);
}
} // End of namespace Graphics