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https://github.com/minetest/irrlicht.git
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408 lines
11 KiB
C++
408 lines
11 KiB
C++
// Copyright (C) 2002-2012 Nikolaus Gebhardt / Thomas Alten
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// This file is part of the "Irrlicht Engine".
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// For conditions of distribution and use, see copyright notice in irrlicht.h
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#include "CImage.h"
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#include "irrString.h"
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#include "CColorConverter.h"
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#include "CBlit.h"
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#include "os.h"
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#include "SoftwareDriver2_helper.h"
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namespace irr
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{
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namespace video
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{
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//! Constructor from raw data
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CImage::CImage(ECOLOR_FORMAT format, const core::dimension2d<u32>& size, void* data,
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bool ownForeignMemory, bool deleteMemory) : IImage(format, size, deleteMemory)
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{
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if (ownForeignMemory)
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{
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Data = (u8*)data;
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}
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else
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{
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const u32 dataSize = getDataSizeFromFormat(Format, Size.Width, Size.Height);
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Data = new u8[align_next(dataSize,16)];
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memcpy(Data, data, dataSize);
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DeleteMemory = true;
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}
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}
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//! Constructor of empty image
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CImage::CImage(ECOLOR_FORMAT format, const core::dimension2d<u32>& size) : IImage(format, size, true)
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{
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Data = new u8[align_next(getDataSizeFromFormat(Format, Size.Width, Size.Height),16)];
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DeleteMemory = true;
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}
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//! sets a pixel
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void CImage::setPixel(u32 x, u32 y, const SColor &color, bool blend)
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{
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if (x >= Size.Width || y >= Size.Height)
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return;
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switch(Format)
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{
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case ECF_A1R5G5B5:
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{
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u16 * dest = (u16*) (Data + ( y * Pitch ) + ( x << 1 ));
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*dest = video::A8R8G8B8toA1R5G5B5( color.color );
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} break;
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case ECF_R5G6B5:
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{
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u16 * dest = (u16*) (Data + ( y * Pitch ) + ( x << 1 ));
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*dest = video::A8R8G8B8toR5G6B5( color.color );
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} break;
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case ECF_R8G8B8:
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{
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u8* dest = Data + ( y * Pitch ) + ( x * 3 );
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dest[0] = (u8)color.getRed();
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dest[1] = (u8)color.getGreen();
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dest[2] = (u8)color.getBlue();
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} break;
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case ECF_A8R8G8B8:
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{
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u32 * dest = (u32*) (Data + ( y * Pitch ) + ( x << 2 ));
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*dest = blend ? PixelBlend32 ( *dest, color.color ) : color.color;
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} break;
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IRR_CASE_IIMAGE_COMPRESSED_FORMAT
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os::Printer::log("IImage::setPixel method doesn't work with compressed images.", ELL_WARNING);
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return;
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case ECF_UNKNOWN:
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os::Printer::log("IImage::setPixel unknown format.", ELL_WARNING);
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return;
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default:
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break;
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}
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}
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//! returns a pixel
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SColor CImage::getPixel(u32 x, u32 y) const
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{
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if (x >= Size.Width || y >= Size.Height)
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return SColor(0);
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switch(Format)
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{
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case ECF_A1R5G5B5:
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return A1R5G5B5toA8R8G8B8(((u16*)Data)[y*Size.Width + x]);
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case ECF_R5G6B5:
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return R5G6B5toA8R8G8B8(((u16*)Data)[y*Size.Width + x]);
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case ECF_A8R8G8B8:
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return ((u32*)Data)[y*Size.Width + x];
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case ECF_R8G8B8:
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{
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u8* p = Data+(y*3)*Size.Width + (x*3);
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return SColor(255,p[0],p[1],p[2]);
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}
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IRR_CASE_IIMAGE_COMPRESSED_FORMAT
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os::Printer::log("IImage::getPixel method doesn't work with compressed images.", ELL_WARNING);
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break;
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case ECF_UNKNOWN:
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os::Printer::log("IImage::getPixel unknown format.", ELL_WARNING);
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break;
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default:
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break;
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}
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return SColor(0);
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}
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//! copies this surface into another at given position
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void CImage::copyTo(IImage* target, const core::position2d<s32>& pos)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::copyTo method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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if (!Blit(BLITTER_TEXTURE, target, 0, &pos, this, 0, 0)
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&& target && pos.X == 0 && pos.Y == 0 &&
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CColorConverter::canConvertFormat(Format, target->getColorFormat()))
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{
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// No fast blitting, but copyToScaling uses other color conversions and might work
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irr::core::dimension2du dim(target->getDimension());
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copyToScaling(target->getData(), dim.Width, dim.Height, target->getColorFormat(), target->getPitch());
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}
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}
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//! copies this surface partially into another at given position
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void CImage::copyTo(IImage* target, const core::position2d<s32>& pos, const core::rect<s32>& sourceRect, const core::rect<s32>* clipRect)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::copyTo method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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Blit(BLITTER_TEXTURE, target, clipRect, &pos, this, &sourceRect, 0);
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}
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//! copies this surface into another, using the alpha mask, a cliprect and a color to add with
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void CImage::copyToWithAlpha(IImage* target, const core::position2d<s32>& pos, const core::rect<s32>& sourceRect, const SColor &color, const core::rect<s32>* clipRect, bool combineAlpha)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::copyToWithAlpha method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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eBlitter op = combineAlpha ? BLITTER_TEXTURE_COMBINE_ALPHA :
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color.color == 0xFFFFFFFF ? BLITTER_TEXTURE_ALPHA_BLEND : BLITTER_TEXTURE_ALPHA_COLOR_BLEND;
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Blit(op,target, clipRect, &pos, this, &sourceRect, color.color);
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}
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//! copies this surface into another, scaling it to the target image size
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// note: this is very very slow.
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void CImage::copyToScaling(void* target, u32 width, u32 height, ECOLOR_FORMAT format, u32 pitch)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::copyToScaling method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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if (!target || !width || !height || !Size.Width || !Size.Height)
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return;
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const u32 bpp=getBitsPerPixelFromFormat(format)/8;
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if (0==pitch)
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pitch = width*bpp;
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if (Format==format && Size.Width==width && Size.Height==height)
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{
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if (pitch==Pitch)
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{
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memcpy(target, Data, height*pitch);
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return;
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}
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else
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{
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u8* tgtpos = (u8*) target;
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u8* srcpos = Data;
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const u32 bwidth = width*bpp;
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const u32 rest = pitch-bwidth;
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for (u32 y=0; y<height; ++y)
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{
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// copy scanline
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memcpy(tgtpos, srcpos, bwidth);
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// clear pitch
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memset(tgtpos+bwidth, 0, rest);
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tgtpos += pitch;
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srcpos += Pitch;
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}
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return;
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}
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}
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// NOTE: Scaling is coded to keep the border pixels intact.
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// Alternatively we could for example work with first pixel being taken at half step-size.
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// Then we have one more step here and it would be:
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// sourceXStep = (f32)(Size.Width-1) / (f32)(width);
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// And sx would start at 0.5f + sourceXStep / 2.f;
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// Similar for y.
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// As scaling is done without any antialiasing it doesn't matter too much which outermost pixels we use and keeping
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// border pixels intact is probably mostly better (with AA the other solution would be more correct).
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// This is however unnecessary (and unexpected) for scaling to integer multiples, so don't do it there.
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f32 sourceXStep, sourceYStep;
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f32 sourceXStart = 0.f, sourceYStart = 0.f;
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if (width % Size.Width == 0)
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sourceXStep = (f32)(Size.Width) / (f32)(width);
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else
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{
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sourceXStep = width > 1 ? (f32)(Size.Width-1) / (f32)(width-1) : 0.f;
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sourceXStart = 0.5f; // for rounding to nearest pixel
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}
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if (height % Size.Height == 0)
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sourceYStep = (f32)(Size.Height) / (f32)(height);
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else
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{
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sourceYStep = height > 1 ? (f32)(Size.Height-1) / (f32)(height-1) : 0.f;
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sourceYStart = 0.5f; // for rounding to nearest pixel
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}
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s32 yval=0, syval=0;
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f32 sy = sourceYStart;
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for (u32 y=0; y<height; ++y)
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{
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f32 sx = sourceXStart;
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for (u32 x=0; x<width; ++x)
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{
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CColorConverter::convert_viaFormat(Data+ syval + ((s32)sx)*BytesPerPixel, Format, 1, ((u8*)target)+ yval + (x*bpp), format);
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sx+=sourceXStep;
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}
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sy+=sourceYStep;
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syval=(s32)(sy)*Pitch;
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yval+=pitch;
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}
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}
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//! copies this surface into another, scaling it to the target image size
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// note: this is very very slow.
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void CImage::copyToScaling(IImage* target)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::copyToScaling method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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if (!target)
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return;
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const core::dimension2d<u32>& targetSize = target->getDimension();
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if (targetSize==Size)
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{
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copyTo(target);
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return;
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}
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copyToScaling(target->getData(), targetSize.Width, targetSize.Height, target->getColorFormat());
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}
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//! copies this surface into another, scaling it to fit it.
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void CImage::copyToScalingBoxFilter(IImage* target, s32 bias, bool blend)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::copyToScalingBoxFilter method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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const core::dimension2d<u32> destSize = target->getDimension();
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const f32 sourceXStep = (f32) Size.Width / (f32) destSize.Width;
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const f32 sourceYStep = (f32) Size.Height / (f32) destSize.Height;
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s32 fx = core::ceil32( sourceXStep );
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s32 fy = core::ceil32( sourceYStep );
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f32 sx;
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f32 sy;
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sy = 0.f;
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for ( u32 y = 0; y != destSize.Height; ++y )
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{
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sx = 0.f;
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for ( u32 x = 0; x != destSize.Width; ++x )
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{
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target->setPixel( x, y,
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getPixelBox( core::floor32(sx), core::floor32(sy), fx, fy, bias ), blend );
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sx += sourceXStep;
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}
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sy += sourceYStep;
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}
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}
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//! fills the surface with given color
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void CImage::fill(const SColor &color)
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::fill method doesn't work with compressed images.", ELL_WARNING);
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return;
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}
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u32 c;
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switch ( Format )
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{
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case ECF_A1R5G5B5:
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c = color.toA1R5G5B5();
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c |= c << 16;
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break;
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case ECF_R5G6B5:
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c = video::A8R8G8B8toR5G6B5( color.color );
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c |= c << 16;
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break;
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case ECF_A8R8G8B8:
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c = color.color;
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break;
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case ECF_R8G8B8:
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{
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u8 rgb[3];
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CColorConverter::convert_A8R8G8B8toR8G8B8(&color, 1, rgb);
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const u32 size = getImageDataSizeInBytes();
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for (u32 i=0; i<size; i+=3)
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{
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memcpy(Data+i, rgb, 3);
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}
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return;
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}
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break;
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default:
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// TODO: Handle other formats
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return;
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}
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memset32( Data, c, getImageDataSizeInBytes() );
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}
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//! get a filtered pixel
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inline SColor CImage::getPixelBox( s32 x, s32 y, s32 fx, s32 fy, s32 bias ) const
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{
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if (IImage::isCompressedFormat(Format))
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{
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os::Printer::log("IImage::getPixelBox method doesn't work with compressed images.", ELL_WARNING);
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return SColor(0);
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}
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SColor c;
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s32 a = 0, r = 0, g = 0, b = 0;
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for ( s32 dx = 0; dx != fx; ++dx )
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{
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for ( s32 dy = 0; dy != fy; ++dy )
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{
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c = getPixel( core::s32_min ( x + dx, Size.Width - 1 ) ,
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core::s32_min ( y + dy, Size.Height - 1 )
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);
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a += c.getAlpha();
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r += c.getRed();
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g += c.getGreen();
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b += c.getBlue();
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}
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}
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s32 sdiv = s32_log2_s32(fx * fy);
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a = core::s32_clamp( ( a >> sdiv ) + bias, 0, 255 );
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r = core::s32_clamp( ( r >> sdiv ) + bias, 0, 255 );
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g = core::s32_clamp( ( g >> sdiv ) + bias, 0, 255 );
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b = core::s32_clamp( ( b >> sdiv ) + bias, 0, 255 );
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c.set( a, r, g, b );
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return c;
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}
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} // end namespace video
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} // end namespace irr
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