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65 lines
2.3 KiB
C++
65 lines
2.3 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
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include "graphics/pixelformat.h"
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#include "common/algorithm.h"
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namespace Graphics {
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Common::String PixelFormat::toString() const {
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if (bytesPerPixel == 1)
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return "CLUT8";
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// We apply a trick to simplify the code here. We encode all the shift,
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// loss, and component name in the component entry. By having the shift as
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// highest entry we can sort according to shift.
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// This works because in valid RGB PixelFormats shift values needs to be
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// distinct except when the loss is 8. However, components with loss value
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// of 8 are not printed, thus their position does not matter.
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int component[4];
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component[0] = (rShift << 16) | (rLoss << 8) | 'R';
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component[1] = (gShift << 16) | (gLoss << 8) | 'G';
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component[2] = (bShift << 16) | (bLoss << 8) | 'B';
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component[3] = (aShift << 16) | (aLoss << 8) | 'A';
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// Sort components according to descending shift value.
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Common::sort(component, component + ARRAYSIZE(component), Common::Greater<int>());
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Common::String letters, digits;
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for (int i = 0; i < ARRAYSIZE(component); ++i) {
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const int componentLoss = (component[i] >> 8) & 0xFF;
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// A loss of 8 means that the component does not exist.
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if (componentLoss == 8) {
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continue;
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}
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const char componentName = component[i] & 0xFF;
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letters += componentName;
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digits += '0' + 8 - componentLoss;
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}
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return letters + digits;
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}
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} // End of namespace Graphics
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