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/* 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/debug.h"
#include "common/textconsole.h"
#include "graphics/scaler/downscaler.h"
#include "graphics/scaler/intern.h"
namespace Graphics {
#ifdef USE_ARM_SCALER_ASM
extern "C" {
void downscaleAllByHalfARM(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height, int mask, int round);
}
void downscaleAllByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height, int gBitFormat) {
// Rounding constants and masks used for different pixel formats
static const int roundingconstants[] = { 0x00200802, 0x00201002 };
static const int redbluegreenMasks[] = { 0x03E07C1F, 0x07E0F81F };
const int maskUsed = (gBitFormat == 565);
downscaleAllByHalfARM(srcPtr, srcPitch, dstPtr, dstPitch, width, height, redbluegreenMasks[maskUsed], roundingconstants[maskUsed]);
}
#else
template<typename ColorMask>
void downscaleAllByHalfTemplate(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height) {
uint8 *work;
uint16 srcPitch16 = (uint16)(srcPitch / sizeof(uint16));
while ((height -= 2) >= 0) {
work = dstPtr;
for (int i=0; i<width; i+=2) {
// Another lame filter attempt :)
uint16 color1 = *(((const uint16 *)srcPtr) + i);
uint16 color2 = *(((const uint16 *)srcPtr) + (i + 1));
uint16 color3 = *(((const uint16 *)srcPtr) + (i + srcPitch16));
uint16 color4 = *(((const uint16 *)srcPtr) + (i + srcPitch16 + 1));
*(((uint16 *)work) + 0) = interpolate16_1_1_1_1<ColorMask>(color1, color2, color3, color4);
work += sizeof(uint16);
}
srcPtr += 2 * srcPitch;
dstPtr += dstPitch;
}
}
void downscaleAllByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int width, int height, int gBitFormat) {
if (gBitFormat == 565)
downscaleAllByHalfTemplate<Graphics::ColorMasks<565> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
else
downscaleAllByHalfTemplate<Graphics::ColorMasks<555> >(srcPtr, srcPitch, dstPtr, dstPitch, width, height);
}
#endif
namespace {
uint32 getBrightness(byte col, const byte *pal) {
return pal[3 * col] * pal[3 * col] + pal[3 * col + 1] * pal[3 * col + 1] + pal[3 * col + 2] * pal[3 * col + 2];
}
void downscaleCLUT8ByHalf(const uint8 *srcPtr, uint32 srcPitch, uint8 *dstPtr, uint32 dstPitch, int maxX, int maxY, const byte *palette) {
const byte *src1 = srcPtr;
const byte *src2 = srcPtr + srcPitch;
byte *dst = dstPtr;
int32 srcSkip = 2 * srcPitch - maxX * 2;
int32 dstSkip = dstPitch - maxX;
for (int y = 0; y < maxY; y++) {
for (int x = 0; x < maxX; x++) {
// Choose the brightest pixel. Writing often is bright on
// a dark background, so this preserves text as much as we can.
byte colors[4] = {
*src1++,
*src1++,
*src2++,
*src2++
};
byte col = colors[0];
uint32 bri = getBrightness(col, palette);
for (uint i = 1; i < 4; i++) {
uint32 nbri = getBrightness(colors[i], palette);
if (nbri > bri) {
bri = nbri;
col = colors[i];
}
}
*dst++ = col;
}
src1 += srcSkip;
src2 += srcSkip;
dst += dstSkip;
}
}
} // end of anonymous namespsce
void downscaleSurfaceByHalf(Surface *out, const Surface *in, const byte *palette) {
if (in->format.isCLUT8() && out->format.isCLUT8() && palette != nullptr) {
downscaleCLUT8ByHalf((const byte *) in->getBasePtr(0, 0), in->pitch, (byte *) out->getBasePtr(0, 0), out->pitch,
MIN<int>(out->w, in->w / 2), MIN<int>(out->h, in->h / 2), palette);
return;
}
if ((in->format == PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0)
&& out->format == PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0))
|| (in->format == PixelFormat(2, 5, 6, 5, 0, 0, 5, 11, 0)
&& out->format == PixelFormat(2, 5, 6, 5, 0, 0, 5, 11, 0))) {
downscaleAllByHalf((const byte *) in->getBasePtr(0, 0), in->pitch, (byte *) out->getBasePtr(0, 0), out->pitch,
MIN<int>(in->w, out->w * 2), MIN<int>(in->h, out->h * 2), 565);
return;
}
if ((in->format == PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0)
&& out->format == PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0))
|| (in->format == PixelFormat(2, 5, 5, 5, 0, 0, 5, 10, 0)
&& out->format == PixelFormat(2, 5, 5, 5, 0, 0, 5, 10, 0))) {
downscaleAllByHalf((const byte *) in->getBasePtr(0, 0), in->pitch, (byte *) out->getBasePtr(0, 0), out->pitch,
MIN<int>(in->w, out->w * 2), MIN<int>(in->h, out->h * 2), 555);
return;
}
error("downscaleCLUT8ByHalf(): Unsupported downscale format %s->%s", in->format.toString().c_str(), out->format.toString().c_str());
}
} // end of namespace Graphics
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