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fix issue that grayscale jpeg can't be shwon

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This commit is contained in:
Jinhao 2020-04-30 04:16:35 +08:00
parent e09b57ca12
commit cf71da94c4
1 changed files with 66 additions and 34 deletions
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66
source/paint/pixel_buffer.cpp
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@ -1,7 +1,7 @@
/*
* Pixel Buffer Implementation
* Nana C++ Library(http://www.nanapro.org)
* Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
* Copyright(C) 2003-2020 Jinhao(cnjinhao@hotmail.com)
*
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE_1_0.txt or copy at
@ -190,20 +190,22 @@ namespace nana{ namespace paint
if (!raw_pixel_buffer)
return;
auto rawptr = raw_pixel_buffer;
if(32 == bits_per_pixel)
if ((32 == bits_per_pixel) && (pixel_size.width == width) && (pixel_size.height == height) && (this->bytes_per_line == bytes_per_line) && is_negative)
{
if((pixel_size.width == width) && (pixel_size.height == height) && is_negative)
{
memcpy(rawptr, rawbits, (pixel_size.width * pixel_size.height) * 4);
memcpy(raw_pixel_buffer, rawbits, (bytes_per_line * pixel_size.height));
return;
}
else
{
std::size_t line_bytes = (pixel_size.width < width ? pixel_size.width : width) * sizeof(pixel_color_t);
if(pixel_size.width < width)
width = pixel_size.width;
if(pixel_size.height < height)
height = pixel_size.height;
auto rawptr = raw_pixel_buffer;
if(32 == bits_per_pixel)
{
auto d = rawptr;
const unsigned char* s;
int src_line_bytes;
@ -221,12 +223,11 @@ namespace nana{ namespace paint
for(std::size_t i = 0; i < height; ++i)
{
memcpy(d, s, line_bytes);
memcpy(d, s, this->bytes_per_line);
d += pixel_size.width;
s -= src_line_bytes;
}
}
}
else if(24 == bits_per_pixel)
{
if(pixel_size.width < width)
@ -269,12 +270,6 @@ namespace nana{ namespace paint
}
else if(16 == bits_per_pixel)
{
if(pixel_size.width < width)
width = pixel_size.width;
if(pixel_size.height < height)
height = pixel_size.height;
unsigned char rgb_table[32];
for(std::size_t i =0; i < 32; ++i)
rgb_table[i] = static_cast<unsigned char>(i * 255 / 31);
@ -310,6 +305,32 @@ namespace nana{ namespace paint
rawbits -= src_bytes_per_line;
}
}
else if(8 == bits_per_pixel)
{
int src_bytes_per_line;
if(!is_negative)
{
rawbits += bytes_per_line * (height - 1);
src_bytes_per_line = -static_cast<int>(bytes_per_line);
}
else
src_bytes_per_line = static_cast<int>(bytes_per_line);
for(std::size_t top = 0; top < height; ++top)
{
auto dst = rawptr;
for(auto p = rawbits, end = rawbits + width; p < end; ++p)
{
dst->element.red = *p;
dst->element.green = *p;
dst->element.blue = *p;
++dst;
}
rawbits += src_bytes_per_line;
rawptr += this->bytes_per_line;
}
}
}
#if defined(NANA_X11)
@ -691,6 +712,17 @@ namespace nana{ namespace paint
++px;
}
}
else if(8 == bits_per_pixel)
{
//Grayscale
for (auto p = row_ptr, end = row_ptr + px_count; p != end; ++p)
{
p->element.red = *buffer;
p->element.green = *buffer;
p->element.blue = *buffer;
++buffer;
}
}
}