1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Copyright (c) 2020, Ben Jilks <benjyjilks@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Vector.h>
#include <LibGfx/BMPWriter.h>
#include <LibGfx/Bitmap.h>
#include <cstring>
namespace Gfx {
constexpr int bytes_per_pixel = 3;
#define FILE_HEADER_SIZE 14
#define IMAGE_INFORMATION_SIZE 40
#define PIXEL_DATA_OFFSET FILE_HEADER_SIZE + IMAGE_INFORMATION_SIZE
class Streamer {
public:
Streamer(u8* data)
: m_data(data)
{
}
void write_u8(u8 i)
{
*(m_data++) = i;
}
void write_u16(u16 i)
{
*(m_data++) = i & 0xFF;
*(m_data++) = (i >> 8) & 0xFF;
}
void write_u32(u32 i)
{
write_u16(i & 0xFFFF);
write_u16((i >> 16) & 0xFFFF);
}
void write_i32(i32 i)
{
write_u32(static_cast<u32>(i));
}
private:
u8* m_data;
};
static ByteBuffer write_pixel_data(const RefPtr<Bitmap> bitmap, int pixel_row_data_size)
{
int image_size = pixel_row_data_size * bitmap->height();
auto buffer = ByteBuffer::create_uninitialized(image_size);
int current_row = 0;
for (int y = bitmap->height() - 1; y >= 0; --y) {
auto* row = buffer.data() + (pixel_row_data_size * current_row++);
for (int x = 0; x < bitmap->width(); x++) {
auto pixel = bitmap->get_pixel(x, y);
row[x * bytes_per_pixel + 0] = pixel.blue();
row[x * bytes_per_pixel + 1] = pixel.green();
row[x * bytes_per_pixel + 2] = pixel.red();
}
}
return buffer;
}
static ByteBuffer compress_pixel_data(const ByteBuffer& pixel_data, BMPWriter::Compression compression)
{
switch (compression) {
case BMPWriter::Compression::RGB:
return pixel_data;
}
ASSERT_NOT_REACHED();
}
ByteBuffer BMPWriter::dump(const RefPtr<Bitmap> bitmap)
{
int pixel_row_data_size = (bytes_per_pixel * 8 * bitmap->width() + 31) / 32 * 4;
int image_size = pixel_row_data_size * bitmap->height();
auto buffer = ByteBuffer::create_uninitialized(PIXEL_DATA_OFFSET);
auto pixel_data = write_pixel_data(bitmap, pixel_row_data_size);
pixel_data = compress_pixel_data(pixel_data, m_compression);
int file_size = PIXEL_DATA_OFFSET + pixel_data.size();
Streamer streamer(buffer.data());
streamer.write_u8('B');
streamer.write_u8('M');
streamer.write_u32(file_size);
streamer.write_u32(0);
streamer.write_u32(PIXEL_DATA_OFFSET);
streamer.write_u32(IMAGE_INFORMATION_SIZE); // Header size
streamer.write_i32(bitmap->width()); // ImageWidth
streamer.write_i32(bitmap->height()); // ImageHeight
streamer.write_u16(1); // Planes
streamer.write_u16(bytes_per_pixel * 8); // BitsPerPixel
streamer.write_u32((u32)m_compression); // Compression
streamer.write_u32(image_size); // ImageSize
streamer.write_i32(0); // XpixelsPerMeter
streamer.write_i32(0); // YpixelsPerMeter
streamer.write_u32(0); // TotalColors
streamer.write_u32(0); // ImportantColors
buffer.append(pixel_data.data(), pixel_data.size());
return buffer;
}
}
|
