/**
* Loads an image from file
*
* @param string $image filename
*
* @return bool|PEAR_Error TRUE or a PEAR_Error object on error
*
* @access public
*/
function load($image)
{
$this->free();
$this->image = $image;
$result = $this->_get_image_details($image);
if (PEAR::isError($result)) {
return $result;
}
if (!$this->supportsType($this->type, 'r')) {
return PEAR::raiseError('Image type not supported for input', IMAGE_TRANSFORM_ERROR_UNSUPPORTED);
}
$this->surface = cairo_image_surface_create_from_png($this->image);
if (cairo_surface_status($this->surface) != CAIRO_STATUS_SUCCESS) {
$this->surface = null;
return PEAR::raiseError('Error while loading image file.', IMAGE_TRANSFORM_ERROR_IO);
}
return true;
}
/**
* 画像を合成
*
* 画像ファイル(PNG)を合成します。
*
* @param string $file ファイル名
* @param int $x X座標
* @param int $y Y座標
* @param float $alpha アルファブレンディング(0..1)
*
* @return void
*/
public function addImage($file, $x = 0, $y = 0, $alpha = 1.0)
{
$file = $this->loadRemoteFile($file);
$surfce = cairo_image_surface_create_from_png($file);
cairo_set_source_surface($this->image, $surfce, $x, $y);
cairo_paint_with_alpha($this->image, $alpha);
}
/**
* Draw an image
*
* The image will be inlined in the SVG document using data URL scheme. For
* this the mime type and base64 encoded file content will be merged to
* URL.
*
* @param mixed $file Image file
* @param ezcGraphCoordinate $position Top left position
* @param mixed $width Width of image in destination image
* @param mixed $height Height of image in destination image
* @return void
*/
public function drawImage($file, ezcGraphCoordinate $position, $width, $height)
{
$this->initiliazeSurface();
// Ensure given bitmap is a PNG image
$data = getimagesize($file);
if ($data[2] !== IMAGETYPE_PNG) {
throw new Exception('Cairo only has support for PNGs.');
}
// Create new surface from given bitmap
$imageSurface = cairo_image_surface_create_from_png($file);
// Create pattern from source image to be able to transform it
$pattern = cairo_pattern_create_for_surface($imageSurface);
// Scale pattern to defined dimensions and move it to its destination position
$matrix = cairo_matrix_multiply($move = cairo_matrix_create_translate(-$position->x, -$position->y), $scale = cairo_matrix_create_scale($data[0] / $width, $data[1] / $height));
cairo_pattern_set_matrix($pattern, $matrix);
// Merge surfaces
cairo_set_source($this->context, $pattern);
cairo_rectangle($this->context, $position->x, $position->y, $width, $height);
cairo_fill($this->context);
}
