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// license:BSD-3-Clause
// copyright-holders:Dankan1890;Victor Laskin
/***************************************************************************
mewui/icorender.h
ICOns file loader.
Original code by Victor Laskin (victor.laskin@gmail.com)
http://vitiy.info/Code/ico.cpp
Revised for MEWUI by dankan1890.
***************************************************************************/
#pragma once
#ifndef __MEWUI_ICORENDER_H__
#define __MEWUI_ICORENDER_H__
// These next two structs represent how the icon information is stored
// in an ICO file.
typedef struct
{
UINT8 bWidth; // Width of the image
UINT8 bHeight; // Height of the image (times 2)
UINT8 bColorCount; // Number of colors in image (0 if >=8bpp)
UINT8 bReserved; // Reserved
UINT16 wPlanes; // Color Planes
UINT16 wBitCount; // Bits per pixel
UINT32 dwBytesInRes; // how many bytes in this resource?
UINT32 dwImageOffset; // where in the file is this image
} ICONDIRENTRY, *LPICONDIRENTRY;
typedef struct
{
UINT16 idReserved; // Reserved
UINT16 idType; // resource type (1 for icons)
UINT16 idCount; // how many images?
//ICONDIRENTRY idEntries[1]; // the entries for each image
} ICONDIR, *LPICONDIR;
// size - 40 bytes
typedef struct {
UINT32 biSize;
UINT32 biWidth;
UINT32 biHeight; // Icon Height (added height of XOR-Bitmap and AND-Bitmap)
UINT16 biPlanes;
UINT16 biBitCount;
UINT32 biCompression;
INT32 biSizeImage;
UINT32 biXPelsPerMeter;
UINT32 biYPelsPerMeter;
UINT32 biClrUsed;
UINT32 biClrImportant;
} s_BITMAPINFOHEADER, *s_PBITMAPINFOHEADER;
// 46 bytes
typedef struct{
s_BITMAPINFOHEADER icHeader; // DIB header
UINT32 icColors[1]; // Color table (short 4 bytes) //RGBQUAD
UINT8 icXOR[1]; // DIB bits for XOR mask
UINT8 icAND[1]; // DIB bits for AND mask
} ICONIMAGE, *LPICONIMAGE;
//-------------------------------------------------
// load an ICO file into a bitmap
//-------------------------------------------------
void render_load_ico(bitmap_argb32 &bitmap, emu_file &file, const char *dirname, const char *filename)
{
INT32 width = 0;
INT32 height = 0;
// deallocate previous bitmap
bitmap.reset();
// define file's full name
std::string fname;
if (!dirname)
fname = filename;
else
fname.assign(dirname).append(PATH_SEPARATOR).append(filename);
file_error filerr = file.open(fname.c_str());
if (filerr != FILERR_NONE)
return;
// allocates a buffer for the image
UINT64 size = file.size();
UINT8 *buffer = global_alloc_array(UINT8, size + 1);
// read data from the file and set them in the buffer
file.read(buffer, size);
LPICONDIR icoDir = (LPICONDIR)buffer;
int iconsCount = icoDir->idCount;
if (icoDir->idReserved != 0 || icoDir->idType != 1 || iconsCount == 0 || iconsCount > 20)
{
file.close();
global_free_array(buffer);
return;
}
UINT8* cursor = buffer;
cursor += 6;
ICONDIRENTRY* dirEntry = (ICONDIRENTRY*)(cursor);
int maxSize = 0;
int offset = 0;
int maxBitCount = 0;
for (int i = 0; i < iconsCount; i++, ++dirEntry)
{
int w = dirEntry->bWidth;
int h = dirEntry->bHeight;
int bitCount = dirEntry->wBitCount;
if (w * h > maxSize || bitCount > maxBitCount) // we choose icon with max resolution
{
width = w;
height = h;
offset = dirEntry->dwImageOffset;
maxSize = w * h;
}
}
if (offset == 0) return;
cursor = buffer;
cursor += offset;
ICONIMAGE* icon = (ICONIMAGE*)(cursor);
int realBitsCount = (int)icon->icHeader.biBitCount;
bool hasAndMask = (realBitsCount < 32) && (height != icon->icHeader.biHeight);
cursor += 40;
bitmap.allocate(width, height);
// rgba + vertical swap
if (realBitsCount >= 32)
{
for (int x = 0; x < width; ++x)
for (int y = 0; y < height; ++y)
{
int shift2 = 4 * (x + (height - y - 1) * width);
bitmap.pix32(y, x) = rgb_t(cursor[shift2 + 3], cursor[shift2 + 2], cursor[shift2 + 1], cursor[shift2]);
}
}
else if (realBitsCount == 24)
for (int x = 0; x < width; ++x)
for (int y = 0; y < height; ++y)
{
int shift2 = 3 * (x + (height - y - 1) * width);
bitmap.pix32(y, x) = rgb_t(255, cursor[shift2 + 2], cursor[shift2 + 1], cursor[shift2]);
}
else if (realBitsCount == 8) // 256 colors
{
// 256 color table
UINT8 *colors = cursor;
cursor += 256 * 4;
for (int x = 0; x < width; ++x)
for (int y = 0; y < height; ++y)
{
int shift2 = (x + (height - y - 1) * width);
int index = 4 * cursor[shift2];
bitmap.pix32(y, x) = rgb_t(255, colors[index + 2], colors[index + 1], colors[index]);
}
}
else if (realBitsCount == 4) // 16 colors
{
// 16 color table
UINT8 *colors = cursor;
cursor += 16 * 4;
for (int x = 0; x < width; ++x)
for (int y = 0; y < height; ++y)
{
int shift2 = (x + (height - y - 1) * width);
UINT8 index = cursor[shift2 / 2];
if (shift2 % 2 == 0)
index = (index >> 4) & 0xF;
else
index = index & 0xF;
index *= 4;
bitmap.pix32(y, x) = rgb_t(255, colors[index + 2], colors[index + 1], colors[index]);
}
}
else if (realBitsCount == 1) // 2 colors
{
// 2 color table
UINT8 *colors = cursor;
cursor += 2 * 4;
int boundary = width; // !!! 32 bit boundary (http://www.daubnet.com/en/file-format-ico)
while (boundary % 32 != 0) boundary++;
for (int x = 0; x < width; ++x)
for (int y = 0; y < height; ++y)
{
int shift2 = (x + (height - y - 1) * boundary);
UINT8 index = cursor[shift2 / 8];
// select 1 bit only
UINT8 bit = 7 - (x % 8);
index = (index >> bit) & 0x01;
index *= 4;
bitmap.pix32(y, x) = rgb_t(255, colors[index + 2], colors[index + 1], colors[index]);
}
}
// Read AND mask after base color data - 1 BIT MASK
if (hasAndMask)
{
int boundary = width * realBitsCount; // !!! 32 bit boundary (http://www.daubnet.com/en/file-format-ico)
while (boundary % 32 != 0) boundary++;
cursor += boundary * height / 8;
boundary = width;
while (boundary % 32 != 0) boundary++;
for (int y = 0; y < height; ++y)
for (int x = 0; x < width; ++x)
{
UINT8 bit = 7 - (x % 8);
int shift2 = (x + (height - y - 1) * boundary) / 8;
int mask = (0x01 & ((UINT8)cursor[shift2] >> bit));
rgb_t colors = bitmap.pix32(y, x);
UINT8 alpha = colors.a();
alpha *= 1 - mask;
colors.set_a(alpha);
bitmap.pix32(y, x) = colors;
}
}
file.close();
global_free_array(buffer);
}
#endif /* __MEWUI_ICORENDER_H__ */
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