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open bmp image with memory buffer

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This commit is contained in:
Jinhao 2016-01-28 01:36:45 +08:00
parent 3c8ee33ae8
commit 1c938a06fd
1 changed files with 235 additions and 236 deletions
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469
source/paint/detail/image_bmp.hpp
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@ -1,7 +1,7 @@
/*
* Bitmap Format Graphics Implementation
* Nana C++ Library(http://www.nanapro.org)
* Copyright(C) 2003-2015 Jinhao(cnjinhao@hotmail.com)
* Copyright(C) 2003-2016 Jinhao(cnjinhao@hotmail.com)
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
@ -14,14 +14,12 @@
#define NANA_PAINT_DETAIL_IMAGE_BMP_HPP
#include "image_pixbuf.hpp"
#include <memory>
namespace nana{ namespace paint
{
namespace detail
{
#ifndef NANA_WINDOWS
struct bitmap_file_header
{
@ -78,8 +76,237 @@ namespace nana{ namespace paint
bool open(const void* data, std::size_t bytes) override
{
// TODO: read a BMP file from memory
auto bmp_data = reinterpret_cast<const char*>(data);
auto header = reinterpret_cast<const bitmap_file_header*>(bmp_data);
if ((header->bfType != 0x4D42) || (header->bfSize != bytes))
return false;
auto bits = reinterpret_cast<const unsigned char*>(bmp_data + header->bfOffBits);
auto info = reinterpret_cast<const bitmap_info *>(header + 1);
//Bitmap file is 4byte-aligned for each line.
std::size_t bytes_per_line;
const std::size_t height_pixels = std::abs(info->bmiHeader.biHeight);
if (0 == info->bmiHeader.biSizeImage)
bytes_per_line = (((info->bmiHeader.biWidth * info->bmiHeader.biBitCount + 31) & ~31) >> 3);
else
bytes_per_line = info->bmiHeader.biSizeImage / height_pixels;
pixbuf_.open(info->bmiHeader.biWidth, height_pixels);
auto d = pixbuf_.raw_ptr(0);
if (16 <= info->bmiHeader.biBitCount)
{
pixbuf_.put(bits, info->bmiHeader.biWidth, height_pixels, info->bmiHeader.biBitCount, bytes_per_line, (info->bmiHeader.biHeight < 0));
}
else if (8 == info->bmiHeader.biBitCount)
{
const auto lend = d + info->bmiHeader.biWidth * height_pixels;
if (info->bmiHeader.biHeight < 0)
{
auto s = bits;
while (d < lend)
{
auto d_p = d;
auto dpend = d_p + info->bmiHeader.biWidth;
auto s_p = s;
while (d_p != dpend)
{
auto & rgb = info->bmiColors[*s_p++];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while (d < lend)
{
auto d_p = d;
auto* const dpend = d_p + info->bmiHeader.biWidth;
const auto * s_p = s;
while (d_p != dpend)
{
auto & rgb = info->bmiColors[*s_p++];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
}
d = dpend;
s -= bytes_per_line;
}
}
}
else if (4 == info->bmiHeader.biBitCount)
{
const auto * const lend = d + info->bmiHeader.biWidth * height_pixels;
if (info->bmiHeader.biHeight < 0)
{
const unsigned char* s = bits;
while (d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while (d_p != dpend)
{
auto & rgb = info->bmiColors[(index & 1) ? (s[index >> 1] & 0xF) : (s[index >> 1] & 0xF0) >> 4];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while (d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while (d_p != dpend)
{
auto & rgb = info->bmiColors[(index & 1) ? (s[index >> 1] & 0xF) : (s[index >> 1] & 0xF0) >> 4];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s -= bytes_per_line;
}
}
}
else if (2 == info->bmiHeader.biBitCount)
{
const auto * const lend = d + info->bmiHeader.biWidth * height_pixels;
if (info->bmiHeader.biHeight < 0)
{
const unsigned char* s = bits;
while (d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while (d_p != dpend)
{
unsigned shift = (3 - (index & 0x3)) << 1; // (index % 4) * 2
auto& rgb = info->bmiColors[(s[index >> 2] & (0x3 << shift)) >> shift];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while (d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while (d_p != dpend)
{
unsigned shift = (3 - (index & 0x3)) << 1; // (index % 4) * 2
auto& rgb = info->bmiColors[(s[index >> 2] & (0x3 << shift)) >> shift];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s -= bytes_per_line;
}
}
}
else if (1 == info->bmiHeader.biBitCount)
{
const auto * const lend = d + info->bmiHeader.biWidth * height_pixels;
if (info->bmiHeader.biHeight < 0)
{
const auto* s = bits;
while (d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while (d_p != dpend)
{
unsigned bi = (7 - (index & 7)); //(index % 8)
auto & rgb = info->bmiColors[(s[index >> 3] & (1 << bi)) >> bi];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while (d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while (d_p != dpend)
{
unsigned bi = (7 - (index & 7));
auto & rgb = info->bmiColors[(s[index >> 3] & (1 << bi)) >> bi];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s -= bytes_per_line;
}
}
}
return true;
}
bool open(const nana::experimental::filesystem::path& filename) override
@ -97,238 +324,10 @@ namespace nana{ namespace paint
std::unique_ptr<char[]> buffer(new char[static_cast<int>(size)]);
ifs.read(buffer.get(), size);
if(size == ifs.gcount())
{
bitmap_file_header * header = reinterpret_cast<bitmap_file_header*>(buffer.get());
if((header->bfType == 0x4D42) && (static_cast<std::streamsize>(header->bfSize) == size))
{
unsigned char* bits = reinterpret_cast<unsigned char*>(buffer.get() + header->bfOffBits);
bitmap_info * info = reinterpret_cast<bitmap_info *>(header + 1);
//Bitmap file is 4byte-aligned for each line.
std::size_t bytes_per_line;
const std::size_t height_pixels = std::abs(info->bmiHeader.biHeight);
if(0 == info->bmiHeader.biSizeImage)
bytes_per_line = (((info->bmiHeader.biWidth * info->bmiHeader.biBitCount + 31) & ~31) >> 3);
else
bytes_per_line = info->bmiHeader.biSizeImage / height_pixels;
pixbuf_.open(info->bmiHeader.biWidth, height_pixels);
auto d = pixbuf_.raw_ptr(0);
if(16 <= info->bmiHeader.biBitCount)
{
pixbuf_.put(bits, info->bmiHeader.biWidth, height_pixels, info->bmiHeader.biBitCount, bytes_per_line, (info->bmiHeader.biHeight < 0));
if (size == ifs.gcount())
return open(buffer.get(), size);
}
else if(8 == info->bmiHeader.biBitCount)
{
const auto lend = d + info->bmiHeader.biWidth * height_pixels;
if(info->bmiHeader.biHeight < 0)
{
auto s = bits;
while(d < lend)
{
auto d_p = d;
auto dpend = d_p + info->bmiHeader.biWidth;
auto s_p = s;
while(d_p != dpend)
{
rgb_quad & rgb = info->bmiColors[*s_p++];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while(d < lend)
{
auto d_p = d;
auto* const dpend = d_p + info->bmiHeader.biWidth;
const auto * s_p = s;
while(d_p != dpend)
{
rgb_quad & rgb = info->bmiColors[*s_p++];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
}
d = dpend;
s -= bytes_per_line;
}
}
}
else if(4 == info->bmiHeader.biBitCount)
{
const auto * const lend = d + info->bmiHeader.biWidth * height_pixels;
if(info->bmiHeader.biHeight < 0)
{
const unsigned char* s = bits;
while(d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while(d_p != dpend)
{
rgb_quad & rgb = info->bmiColors[(index & 1) ? (s[index >> 1] & 0xF) : (s[index >> 1] & 0xF0) >> 4];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while(d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while(d_p != dpend)
{
rgb_quad & rgb = info->bmiColors[(index & 1) ? (s[index >> 1] & 0xF) : (s[index >> 1] & 0xF0) >> 4];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s -= bytes_per_line;
}
}
}
else if(2 == info->bmiHeader.biBitCount)
{
const auto * const lend = d + info->bmiHeader.biWidth * height_pixels;
if(info->bmiHeader.biHeight < 0)
{
const unsigned char* s = bits;
while(d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while(d_p != dpend)
{
unsigned shift = (3 - (index & 0x3)) << 1; // (index % 4) * 2
rgb_quad& rgb = info->bmiColors[(s[index >> 2] & (0x3 << shift))>>shift];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while(d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while(d_p != dpend)
{
unsigned shift = (3 - (index & 0x3)) << 1; // (index % 4) * 2
rgb_quad& rgb = info->bmiColors[(s[index >> 2] & (0x3 << shift))>>shift];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s -= bytes_per_line;
}
}
}
else if(1 == info->bmiHeader.biBitCount)
{
const auto * const lend = d + info->bmiHeader.biWidth * height_pixels;
if(info->bmiHeader.biHeight < 0)
{
const auto* s = bits;
while(d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while(d_p != dpend)
{
unsigned bi = (7 - (index & 7)); //(index % 8)
rgb_quad & rgb = info->bmiColors[(s[index >> 3] & (1 << bi)) >> bi];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s += bytes_per_line;
}
}
else
{
const auto* s = bits + bytes_per_line * (height_pixels - 1);
while(d < lend)
{
auto d_p = d;
auto * const dpend = d_p + info->bmiHeader.biWidth;
unsigned index = 0;
while(d_p != dpend)
{
unsigned bi = (7 - (index & 7));
rgb_quad & rgb = info->bmiColors[(s[index >> 3] & (1 << bi)) >> bi];
d_p->element.red = rgb.rgbRed;
d_p->element.green = rgb.rgbGreen;
d_p->element.blue = rgb.rgbBlue;
d_p->element.alpha_channel = rgb.rgbReserved;
++d_p;
++index;
}
d = dpend;
s -= bytes_per_line;
}
}
}
}
}
}
return (false == pixbuf_.empty());
return false;
}
bool alpha_channel() const override