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conversion_she.cpp
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conversion_she.cpp
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// Aseprite Document Library
// Copyright (c) 2001-2016 David Capello
//
// This file is released under the terms of the MIT license.
// Read LICENSE.txt for more information.
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "doc/conversion_she.h"
#include "base/24bits.h"
#include "doc/algo.h"
#include "doc/color_scales.h"
#include "doc/image_impl.h"
#include "doc/palette.h"
#include "doc/rgbmap.h"
#include "she/surface.h"
#include "she/surface_format.h"
#include <stdexcept>
namespace doc {
namespace {
template<typename ImageTraits, she::SurfaceFormat format>
uint32_t convert_color_to_surface(color_t color, const Palette* palette, const she::SurfaceFormatData* fd) {
static_assert(false && sizeof(ImageTraits), "Invalid color conversion");
return 0;
}
template<>
uint32_t convert_color_to_surface<RgbTraits, she::kRgbaSurfaceFormat>(color_t c, const Palette* palette, const she::SurfaceFormatData* fd) {
return
((rgba_getr(c) << fd->redShift ) & fd->redMask ) |
((rgba_getg(c) << fd->greenShift) & fd->greenMask) |
((rgba_getb(c) << fd->blueShift ) & fd->blueMask ) |
((rgba_geta(c) << fd->alphaShift) & fd->alphaMask);
}
template<>
uint32_t convert_color_to_surface<GrayscaleTraits, she::kRgbaSurfaceFormat>(color_t c, const Palette* palette, const she::SurfaceFormatData* fd) {
return
((graya_getv(c) << fd->redShift ) & fd->redMask ) |
((graya_getv(c) << fd->greenShift) & fd->greenMask) |
((graya_getv(c) << fd->blueShift ) & fd->blueMask ) |
((graya_geta(c) << fd->alphaShift) & fd->alphaMask);
}
template<>
uint32_t convert_color_to_surface<IndexedTraits, she::kRgbaSurfaceFormat>(color_t c0, const Palette* palette, const she::SurfaceFormatData* fd) {
color_t c = palette->getEntry(c0);
return
((rgba_getr(c) << fd->redShift ) & fd->redMask ) |
((rgba_getg(c) << fd->greenShift) & fd->greenMask) |
((rgba_getb(c) << fd->blueShift ) & fd->blueMask ) |
((rgba_geta(c) << fd->alphaShift) & fd->alphaMask);
}
template<>
uint32_t convert_color_to_surface<BitmapTraits, she::kRgbaSurfaceFormat>(color_t c0, const Palette* palette, const she::SurfaceFormatData* fd) {
color_t c = palette->getEntry(c0);
return
((rgba_getr(c) << fd->redShift ) & fd->redMask ) |
((rgba_getg(c) << fd->greenShift) & fd->greenMask) |
((rgba_getb(c) << fd->blueShift ) & fd->blueMask ) |
((rgba_geta(c) << fd->alphaShift) & fd->alphaMask);
}
template<typename ImageTraits, typename AddressType>
void convert_image_to_surface_templ(const Image* image, she::Surface* dst,
int src_x, int src_y, int dst_x, int dst_y, int w, int h, const Palette* palette, const she::SurfaceFormatData* fd)
{
const LockImageBits<ImageTraits> bits(image, gfx::Rect(src_x, src_y, w, h));
typename LockImageBits<ImageTraits>::const_iterator src_it = bits.begin();
#ifdef _DEBUG
typename LockImageBits<ImageTraits>::const_iterator src_end = bits.end();
#endif
for (int v=0; v<h; ++v, ++dst_y) {
AddressType dst_address = AddressType(dst->getData(dst_x, dst_y));
for (int u=0; u<w; ++u) {
ASSERT(src_it != src_end);
*dst_address = convert_color_to_surface<ImageTraits, she::kRgbaSurfaceFormat>(*src_it, palette, fd);
++dst_address;
++src_it;
}
}
}
struct Address24bpp
{
uint8_t* m_ptr;
Address24bpp(uint8_t* ptr) : m_ptr(ptr) { }
Address24bpp& operator++() { m_ptr += 3; return *this; }
Address24bpp& operator*() { return *this; }
Address24bpp& operator=(uint32_t c) {
base::write24bits(m_ptr, c);
return *this;
}
};
template<typename ImageTraits>
void convert_image_to_surface_selector(const Image* image, she::Surface* surface,
int src_x, int src_y, int dst_x, int dst_y, int w, int h, const Palette* palette, const she::SurfaceFormatData* fd)
{
switch (fd->bitsPerPixel) {
case 8:
convert_image_to_surface_templ<ImageTraits, uint8_t*>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, fd);
break;
case 15:
case 16:
convert_image_to_surface_templ<ImageTraits, uint16_t*>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, fd);
break;
case 24:
convert_image_to_surface_templ<ImageTraits, Address24bpp>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, fd);
break;
case 32:
convert_image_to_surface_templ<ImageTraits, uint32_t*>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, fd);
break;
}
}
} // anonymous namespace
void convert_image_to_surface(const Image* image, const Palette* palette,
she::Surface* surface, int src_x, int src_y, int dst_x, int dst_y, int w, int h)
{
gfx::Rect srcBounds(src_x, src_y, w, h);
srcBounds = srcBounds.createIntersection(image->bounds());
if (srcBounds.isEmpty())
return;
src_x = srcBounds.x;
src_y = srcBounds.y;
w = srcBounds.w;
h = srcBounds.h;
gfx::Rect dstBounds(dst_x, dst_y, w, h);
dstBounds = dstBounds.createIntersection(surface->getClipBounds());
if (dstBounds.isEmpty())
return;
src_x += dstBounds.x - dst_x;
src_y += dstBounds.y - dst_y;
dst_x = dstBounds.x;
dst_y = dstBounds.y;
w = dstBounds.w;
h = dstBounds.h;
she::SurfaceLock lockDst(surface);
she::SurfaceFormatData fd;
surface->getFormat(&fd);
switch (image->pixelFormat()) {
case IMAGE_RGB:
convert_image_to_surface_selector<RgbTraits>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, &fd);
break;
case IMAGE_GRAYSCALE:
convert_image_to_surface_selector<GrayscaleTraits>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, &fd);
break;
case IMAGE_INDEXED:
convert_image_to_surface_selector<IndexedTraits>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, &fd);
break;
case IMAGE_BITMAP:
convert_image_to_surface_selector<BitmapTraits>(image, surface, src_x, src_y, dst_x, dst_y, w, h, palette, &fd);
break;
default:
ASSERT(false);
throw std::runtime_error("conversion not supported");
}
}
} // namespace doc