){kind=link}
function GD2BMPstring(&$gd_image)
{
$imageX = ImageSX($gd_image);
$imageY = ImageSY($gd_image);
$BMP = '';
for ($y = $imageY - 1; $y >= 0; $y--) {
$thisline = '';
for ($x = 0; $x < $imageX; $x++) {
$argb = phpthumb_functions::GetPixelColor($gd_image, $x, $y);
$thisline .= chr($argb['blue']) . chr($argb['green']) . chr($argb['red']);
}
while (strlen($thisline) % 4) {
$thisline .= "";
}
$BMP .= $thisline;
}
$bmpSize = strlen($BMP) + 14 + 40;
// BITMAPFILEHEADER [14 bytes] - http://msdn.microsoft.com/library/en-us/gdi/bitmaps_62uq.asp
$BITMAPFILEHEADER = 'BM';
// WORD bfType;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String($bmpSize, 4);
// DWORD bfSize;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String(0, 2);
// WORD bfReserved1;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String(0, 2);
// WORD bfReserved2;
$BITMAPFILEHEADER .= phpthumb_functions::LittleEndian2String(54, 4);
// DWORD bfOffBits;
// BITMAPINFOHEADER - [40 bytes] http://msdn.microsoft.com/library/en-us/gdi/bitmaps_1rw2.asp
$BITMAPINFOHEADER = phpthumb_functions::LittleEndian2String(40, 4);
// DWORD biSize;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String($imageX, 4);
// LONG biWidth;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String($imageY, 4);
// LONG biHeight;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(1, 2);
// WORD biPlanes;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(24, 2);
// WORD biBitCount;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4);
// DWORD biCompression;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4);
// DWORD biSizeImage;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(2835, 4);
// LONG biXPelsPerMeter;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(2835, 4);
// LONG biYPelsPerMeter;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4);
// DWORD biClrUsed;
$BITMAPINFOHEADER .= phpthumb_functions::LittleEndian2String(0, 4);
// DWORD biClrImportant;
return $BITMAPFILEHEADER . $BITMAPINFOHEADER . $BMP;
}
public function WhiteBalance(&$gdimg, $targetColor = '')
{
if (phpthumb_functions::IsHexColor($targetColor)) {
$targetPixel = array('red' => hexdec(substr($targetColor, 0, 2)), 'green' => hexdec(substr($targetColor, 2, 2)), 'blue' => hexdec(substr($targetColor, 4, 2)));
} else {
$Analysis = phpthumb_filters::HistogramAnalysis($gdimg, false);
$targetPixel = array('red' => max(array_keys($Analysis['red'])), 'green' => max(array_keys($Analysis['green'])), 'blue' => max(array_keys($Analysis['blue'])));
}
$grayValue = phpthumb_functions::GrayscaleValue($targetPixel['red'], $targetPixel['green'], $targetPixel['blue']);
$scaleR = $grayValue / $targetPixel['red'];
$scaleG = $grayValue / $targetPixel['green'];
$scaleB = $grayValue / $targetPixel['blue'];
for ($x = 0; $x < ImageSX($gdimg); $x++) {
for ($y = 0; $y < ImageSY($gdimg); $y++) {
$currentPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, max(0, min(255, round($currentPixel['red'] * $scaleR))), max(0, min(255, round($currentPixel['green'] * $scaleG))), max(0, min(255, round($currentPixel['blue'] * $scaleB))), $currentPixel['alpha']);
ImageSetPixel($gdimg, $x, $y, $newColor);
}
}
return true;
}
function GD2ICOstring(&$gd_image_array)
{
foreach ($gd_image_array as $key => $gd_image) {
$ImageWidths[$key] = ImageSX($gd_image);
$ImageHeights[$key] = ImageSY($gd_image);
$bpp[$key] = ImageIsTrueColor($gd_image) ? 32 : 24;
$totalcolors[$key] = ImageColorsTotal($gd_image);
$icXOR[$key] = '';
for ($y = $ImageHeights[$key] - 1; $y >= 0; $y--) {
for ($x = 0; $x < $ImageWidths[$key]; $x++) {
$argb = phpthumb_functions::GetPixelColor($gd_image, $x, $y);
$a = round(255 * ((127 - $argb['alpha']) / 127));
$r = $argb['red'];
$g = $argb['green'];
$b = $argb['blue'];
if ($bpp[$key] == 32) {
$icXOR[$key] .= chr($b) . chr($g) . chr($r) . chr($a);
} elseif ($bpp[$key] == 24) {
$icXOR[$key] .= chr($b) . chr($g) . chr($r);
}
if ($a < 128) {
@($icANDmask[$key][$y] .= '1');
} else {
@($icANDmask[$key][$y] .= '0');
}
}
// mask bits are 32-bit aligned per scanline
while (strlen($icANDmask[$key][$y]) % 32) {
$icANDmask[$key][$y] .= '0';
}
}
$icAND[$key] = '';
foreach ($icANDmask[$key] as $y => $scanlinemaskbits) {
for ($i = 0; $i < strlen($scanlinemaskbits); $i += 8) {
$icAND[$key] .= chr(bindec(str_pad(substr($scanlinemaskbits, $i, 8), 8, '0', STR_PAD_LEFT)));
}
}
}
foreach ($gd_image_array as $key => $gd_image) {
$biSizeImage = $ImageWidths[$key] * $ImageHeights[$key] * ($bpp[$key] / 8);
// BITMAPINFOHEADER - 40 bytes
$BitmapInfoHeader[$key] = '';
$BitmapInfoHeader[$key] .= "(";
// DWORD biSize;
$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($ImageWidths[$key], 4);
// LONG biWidth;
// The biHeight member specifies the combined
// height of the XOR and AND masks.
$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($ImageHeights[$key] * 2, 4);
// LONG biHeight;
$BitmapInfoHeader[$key] .= "";
// WORD biPlanes;
$BitmapInfoHeader[$key] .= chr($bpp[$key]) . "";
// wBitCount;
$BitmapInfoHeader[$key] .= "";
// DWORD biCompression;
$BitmapInfoHeader[$key] .= phpthumb_functions::LittleEndian2String($biSizeImage, 4);
// DWORD biSizeImage;
$BitmapInfoHeader[$key] .= "";
// LONG biXPelsPerMeter;
$BitmapInfoHeader[$key] .= "";
// LONG biYPelsPerMeter;
$BitmapInfoHeader[$key] .= "";
// DWORD biClrUsed;
$BitmapInfoHeader[$key] .= "";
// DWORD biClrImportant;
}
$icondata = "";
// idReserved; // Reserved (must be 0)
$icondata .= "";
// idType; // Resource Type (1 for icons)
$icondata .= phpthumb_functions::LittleEndian2String(count($gd_image_array), 2);
// idCount; // How many images?
$dwImageOffset = 6 + count($gd_image_array) * 16;
foreach ($gd_image_array as $key => $gd_image) {
// ICONDIRENTRY idEntries[1]; // An entry for each image (idCount of 'em)
$icondata .= chr($ImageWidths[$key]);
// bWidth; // Width, in pixels, of the image
$icondata .= chr($ImageHeights[$key]);
// bHeight; // Height, in pixels, of the image
$icondata .= chr($totalcolors[$key]);
// bColorCount; // Number of colors in image (0 if >=8bpp)
$icondata .= "";
// bReserved; // Reserved ( must be 0)
$icondata .= "";
// wPlanes; // Color Planes
$icondata .= chr($bpp[$key]) . "";
// wBitCount; // Bits per pixel
$dwBytesInRes = 40 + strlen($icXOR[$key]) + strlen($icAND[$key]);
$icondata .= phpthumb_functions::LittleEndian2String($dwBytesInRes, 4);
// dwBytesInRes; // How many bytes in this resource?
$icondata .= phpthumb_functions::LittleEndian2String($dwImageOffset, 4);
// dwImageOffset; // Where in the file is this image?
$dwImageOffset += strlen($BitmapInfoHeader[$key]);
$dwImageOffset += strlen($icXOR[$key]);
$dwImageOffset += strlen($icAND[$key]);
}
foreach ($gd_image_array as $key => $gd_image) {
$icondata .= $BitmapInfoHeader[$key];
$icondata .= $icXOR[$key];
$icondata .= $icAND[$key];
}
return $icondata;
}
function ImageCopyRespectAlpha(&$dst_im, &$src_im, $dst_x, $dst_y, $src_x, $src_y, $src_w, $src_h, $opacity_pct = 100)
{
$opacipct = $opacity_pct / 100;
for ($x = $src_x; $x < $src_w; $x++) {
for ($y = $src_y; $y < $src_h; $y++) {
$RealPixel = phpthumb_functions::GetPixelColor($dst_im, $dst_x + $x, $dst_y + $y);
$OverlayPixel = phpthumb_functions::GetPixelColor($src_im, $x, $y);
$alphapct = $OverlayPixel['alpha'] / 127;
$overlaypct = (1 - $alphapct) * $opacipct;
$newcolor = phpthumb_functions::ImageColorAllocateAlphaSafe($dst_im, round($RealPixel['red'] * (1 - $overlaypct)) + $OverlayPixel['red'] * $overlaypct, round($RealPixel['green'] * (1 - $overlaypct)) + $OverlayPixel['green'] * $overlaypct, round($RealPixel['blue'] * (1 - $overlaypct)) + $OverlayPixel['blue'] * $overlaypct, 0);
ImageSetPixel($dst_im, $dst_x + $x, $dst_y + $y, $newcolor);
}
}
return true;
}
function AlphaChannelFlatten()
{
if (!$this->is_alpha) {
// image doesn't have alpha transparency, no need to flatten
$this->DebugMessage('skipping AlphaChannelFlatten() because !$this->is_alpha', __FILE__, __LINE__);
return false;
}
switch ($this->thumbnailFormat) {
case 'png':
case 'ico':
// image has alpha transparency, but output as PNG or ICO which can handle it
$this->DebugMessage('skipping AlphaChannelFlatten() because ($this->thumbnailFormat == "' . $this->thumbnailFormat . '")', __FILE__, __LINE__);
return false;
break;
case 'gif':
// image has alpha transparency, but output as GIF which can handle only single-color transparency
$CurrentImageColorTransparent = ImageColorTransparent($this->gdimg_output);
if ($CurrentImageColorTransparent == -1) {
// no transparent color defined
if (phpthumb_functions::gd_version() < 2.0) {
$this->DebugMessage('AlphaChannelFlatten() failed because GD version is "' . phpthumb_functions::gd_version() . '"', __FILE__, __LINE__);
return false;
}
if ($img_alpha_mixdown_dither = @ImageCreateTrueColor(ImageSX($this->gdimg_output), ImageSY($this->gdimg_output))) {
for ($i = 0; $i <= 255; $i++) {
$dither_color[$i] = ImageColorAllocate($img_alpha_mixdown_dither, $i, $i, $i);
}
// scan through current truecolor image copy alpha channel to temp image as grayscale
for ($x = 0; $x < $this->thumbnail_width; $x++) {
for ($y = 0; $y < $this->thumbnail_height; $y++) {
$PixelColor = phpthumb_functions::GetPixelColor($this->gdimg_output, $x, $y);
ImageSetPixel($img_alpha_mixdown_dither, $x, $y, $dither_color[$PixelColor['alpha'] * 2]);
}
}
// dither alpha channel grayscale version down to 2 colors
ImageTrueColorToPalette($img_alpha_mixdown_dither, true, 2);
// reduce color palette to 256-1 colors (leave one palette position for transparent color)
ImageTrueColorToPalette($this->gdimg_output, true, 255);
// allocate a new color for transparent color index
$TransparentColor = ImageColorAllocate($this->gdimg_output, 1, 254, 253);
ImageColorTransparent($this->gdimg_output, $TransparentColor);
// scan through alpha channel image and note pixels with >50% transparency
$TransparentPixels = array();
for ($x = 0; $x < $this->thumbnail_width; $x++) {
for ($y = 0; $y < $this->thumbnail_height; $y++) {
$AlphaChannelPixel = phpthumb_functions::GetPixelColor($img_alpha_mixdown_dither, $x, $y);
if ($AlphaChannelPixel['red'] > 127) {
ImageSetPixel($this->gdimg_output, $x, $y, $TransparentColor);
}
}
}
ImageDestroy($img_alpha_mixdown_dither);
$this->DebugMessage('AlphaChannelFlatten() set image to 255+1 colors with transparency for GIF output', __FILE__, __LINE__);
return true;
} else {
$this->DebugMessage('AlphaChannelFlatten() failed ImageCreate(' . ImageSX($this->gdimg_output) . ', ' . ImageSY($this->gdimg_output) . ')', __FILE__, __LINE__);
return false;
}
} else {
// a single transparent color already defined, leave as-is
$this->DebugMessage('skipping AlphaChannelFlatten() because ($this->thumbnailFormat == "' . $this->thumbnailFormat . '") and ImageColorTransparent returned "' . $CurrentImageColorTransparent . '"', __FILE__, __LINE__);
return true;
}
break;
}
$this->DebugMessage('continuing AlphaChannelFlatten() for output format "' . $this->thumbnailFormat . '"', __FILE__, __LINE__);
// image has alpha transparency, and is being output in a format that doesn't support it -- flatten
if ($gdimg_flatten_temp = phpthumb_functions::ImageCreateFunction($this->thumbnail_width, $this->thumbnail_height)) {
$this->config_background_hexcolor = $this->bg ? $this->bg : $this->config_background_hexcolor;
if (!phpthumb_functions::IsHexColor($this->config_background_hexcolor)) {
return $this->ErrorImage('Invalid hex color string "' . $this->config_background_hexcolor . '" for parameter "bg"');
}
$background_color = phpthumb_functions::ImageHexColorAllocate($this->gdimg_output, $this->config_background_hexcolor);
ImageFilledRectangle($gdimg_flatten_temp, 0, 0, $this->thumbnail_width, $this->thumbnail_height, $background_color);
ImageCopy($gdimg_flatten_temp, $this->gdimg_output, 0, 0, 0, 0, $this->thumbnail_width, $this->thumbnail_height);
ImageAlphaBlending($this->gdimg_output, true);
ImageSaveAlpha($this->gdimg_output, false);
ImageColorTransparent($this->gdimg_output, -1);
ImageCopy($this->gdimg_output, $gdimg_flatten_temp, 0, 0, 0, 0, $this->thumbnail_width, $this->thumbnail_height);
ImageDestroy($gdimg_flatten_temp);
return true;
} else {
$this->DebugMessage('ImageCreateFunction() failed', __FILE__, __LINE__);
}
return false;
}
function Threshold(&$gdimg, $cutoff)
{
$cutoff = $cutoff ? $cutoff : 128;
for ($x = 0; $x < ImageSX($gdimg); $x++) {
for ($y = 0; $y < ImageSY($gdimg); $y++) {
$currentPixel = phpthumb_functions::GetPixelColor($gdimg, $x, $y);
$grayPixel = phpthumb_functions::GrayscalePixel($currentPixel);
if ($grayPixel['red'] < $cutoff) {
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, 0x0, 0x0, 0x0, $currentPixel['alpha']);
} else {
$newColor = phpthumb_functions::ImageColorAllocateAlphaSafe($gdimg, 0xff, 0xff, 0xff, $currentPixel['alpha']);
}
ImageSetPixel($gdimg, $x, $y, $newColor);
}
}
return true;
}