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<?php |
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/** |
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* @package dompdf |
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* @link https://github.com/dompdf/dompdf |
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* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License |
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*/ |
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namespace Dompdf\FrameReflower; |
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|
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use Dompdf\Helpers; |
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use Dompdf\FrameDecorator\Block as BlockFrameDecorator; |
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use Dompdf\FrameDecorator\Image as ImageFrameDecorator; |
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|
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/** |
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* Image reflower class |
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* |
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* @package dompdf |
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*/ |
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class Image extends AbstractFrameReflower |
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{ |
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|
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/** |
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* Image constructor. |
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* @param ImageFrameDecorator $frame |
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*/ |
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function __construct(ImageFrameDecorator $frame) |
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{ |
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parent::__construct($frame); |
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} |
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|
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/** |
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* @param BlockFrameDecorator|null $block |
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*/ |
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function reflow(BlockFrameDecorator $block = null) |
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{ |
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$this->determine_absolute_containing_block(); |
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|
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// Counters and generated content |
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$this->_set_content(); |
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|
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//FLOAT |
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//$frame = $this->_frame; |
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//$page = $frame->get_root(); |
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|
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//if ($frame->get_style()->float !== "none" ) { |
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// $page->add_floating_frame($this); |
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//} |
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|
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$this->resolve_dimensions(); |
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$this->resolve_margins(); |
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|
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$frame = $this->_frame; |
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$frame->position(); |
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|
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if ($block && $frame->is_in_flow()) { |
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$block->add_frame_to_line($frame); |
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} |
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} |
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|
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public function get_min_max_content_width(): array |
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{ |
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// TODO: While the containing block is not set yet on the frame, it can |
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// already be determined in some cases due to fixed dimensions on the |
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// ancestor forming the containing block. In such cases, percentage |
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// values could be resolved here |
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$style = $this->_frame->get_style(); |
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|
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[$width] = $this->calculate_size(null, null); |
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$min_width = $this->resolve_min_width(null); |
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$percent_width = Helpers::is_percent($style->width) |
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|| Helpers::is_percent($style->max_width) |
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|| ($style->width === "auto" |
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&& (Helpers::is_percent($style->height) || Helpers::is_percent($style->max_height))); |
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|
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// Use the specified min width as minimum when width or max width depend |
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// on the containing block and cannot be resolved yet. This mimics |
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// browser behavior |
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$min = $percent_width ? $min_width : $width; |
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$max = $width; |
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|
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return [$min, $max]; |
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} |
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|
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/** |
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* Calculate width and height, accounting for min/max constraints. |
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* |
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* * https://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width |
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* * https://www.w3.org/TR/CSS21/visudet.html#inline-replaced-height |
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* * https://www.w3.org/TR/CSS21/visudet.html#min-max-widths |
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* * https://www.w3.org/TR/CSS21/visudet.html#min-max-heights |
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* |
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* @param float|null $cbw Width of the containing block. |
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* @param float|null $cbh Height of the containing block. |
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* |
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* @return float[] |
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*/ |
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protected function calculate_size(?float $cbw, ?float $cbh): array |
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{ |
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/** @var ImageFrameDecorator */ |
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$frame = $this->_frame; |
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$style = $frame->get_style(); |
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|
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$computed_width = $style->width; |
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$computed_height = $style->height; |
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|
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$width = $cbw === null && Helpers::is_percent($computed_width) |
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? "auto" |
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: $style->length_in_pt($computed_width, $cbw ?? 0); |
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$height = $cbh === null && Helpers::is_percent($computed_height) |
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? "auto" |
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: $style->length_in_pt($computed_height, $cbh ?? 0); |
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$min_width = $this->resolve_min_width($cbw); |
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$max_width = $this->resolve_max_width($cbw); |
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$min_height = $this->resolve_min_height($cbh); |
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$max_height = $this->resolve_max_height($cbh); |
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|
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if ($width === "auto" && $height === "auto") { |
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// Use intrinsic dimensions, resampled to pt |
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[$img_width, $img_height] = $frame->get_intrinsic_dimensions(); |
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$w = $frame->resample($img_width); |
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$h = $frame->resample($img_height); |
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|
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// Resolve min/max constraints according to the constraint-violation |
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// table in https://www.w3.org/TR/CSS21/visudet.html#min-max-widths |
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$max_width = max($min_width, $max_width); |
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$max_height = max($min_height, $max_height); |
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|
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if (($w > $max_width && $h <= $max_height) |
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|| ($w > $max_width && $h > $max_height && $max_width / $w <= $max_height / $h) |
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|| ($w < $min_width && $h > $min_height) |
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|| ($w < $min_width && $h < $min_height && $min_width / $w > $min_height / $h) |
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) { |
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$width = Helpers::clamp($w, $min_width, $max_width); |
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$height = $width * ($img_height / $img_width); |
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$height = Helpers::clamp($height, $min_height, $max_height); |
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} else { |
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$height = Helpers::clamp($h, $min_height, $max_height); |
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$width = $height * ($img_width / $img_height); |
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$width = Helpers::clamp($width, $min_width, $max_width); |
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} |
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} elseif ($height === "auto") { |
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// Width is fixed, scale height according to aspect ratio |
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[$img_width, $img_height] = $frame->get_intrinsic_dimensions(); |
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$width = Helpers::clamp((float) $width, $min_width, $max_width); |
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$height = $width * ($img_height / $img_width); |
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$height = Helpers::clamp($height, $min_height, $max_height); |
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} elseif ($width === "auto") { |
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// Height is fixed, scale width according to aspect ratio |
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[$img_width, $img_height] = $frame->get_intrinsic_dimensions(); |
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$height = Helpers::clamp((float) $height, $min_height, $max_height); |
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$width = $height * ($img_width / $img_height); |
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$width = Helpers::clamp($width, $min_width, $max_width); |
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} else { |
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// Width and height are fixed |
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$width = Helpers::clamp((float) $width, $min_width, $max_width); |
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$height = Helpers::clamp((float) $height, $min_height, $max_height); |
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} |
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|
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return [$width, $height]; |
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} |
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|
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protected function resolve_dimensions(): void |
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{ |
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/** @var ImageFrameDecorator */ |
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$frame = $this->_frame; |
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$style = $frame->get_style(); |
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|
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$debug_png = $this->get_dompdf()->getOptions()->getDebugPng(); |
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|
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if ($debug_png) { |
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[$img_width, $img_height] = $frame->get_intrinsic_dimensions(); |
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print "resolve_dimensions() " . |
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$frame->get_style()->width . " " . |
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$frame->get_style()->height . ";" . |
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$frame->get_parent()->get_style()->width . " " . |
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$frame->get_parent()->get_style()->height . ";" . |
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$frame->get_parent()->get_parent()->get_style()->width . " " . |
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$frame->get_parent()->get_parent()->get_style()->height . ";" . |
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$img_width . " " . |
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$img_height . "|"; |
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} |
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|
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[, , $cbw, $cbh] = $frame->get_containing_block(); |
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[$width, $height] = $this->calculate_size($cbw, $cbh); |
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|
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if ($debug_png) { |
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print $width . " " . $height . ";"; |
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} |
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|
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$style->set_used("width", $width); |
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$style->set_used("height", $height); |
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} |
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|
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protected function resolve_margins(): void |
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{ |
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// Only handle the inline case for now |
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// https://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width |
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// https://www.w3.org/TR/CSS21/visudet.html#inline-replaced-height |
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$style = $this->_frame->get_style(); |
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|
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if ($style->margin_left === "auto") { |
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$style->set_used("margin_left", 0.0); |
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} |
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if ($style->margin_right === "auto") { |
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$style->set_used("margin_right", 0.0); |
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} |
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if ($style->margin_top === "auto") { |
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$style->set_used("margin_top", 0.0); |
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} |
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if ($style->margin_bottom === "auto") { |
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$style->set_used("margin_bottom", 0.0); |
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} |
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} |
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} |
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|
