214 lines
7.8 KiB
PHP
Executable File
214 lines
7.8 KiB
PHP
Executable File
<?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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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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* 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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* 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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* @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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// Counters and generated content
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$this->_set_content();
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//FLOAT
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//$frame = $this->_frame;
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//$page = $frame->get_root();
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//if ($frame->get_style()->float !== "none" ) {
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// $page->add_floating_frame($this);
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//}
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$this->resolve_dimensions();
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$this->resolve_margins();
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$frame = $this->_frame;
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$frame->position();
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if ($block && $frame->is_in_flow()) {
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$block->add_frame_to_line($frame);
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}
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}
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public function get_min_max_content_width(): array
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{
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// TODO: While the containing block is not set yet on the frame, it can
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// already be determined in some cases due to fixed dimensions on the
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// ancestor forming the containing block. In such cases, percentage
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// values could be resolved here
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$style = $this->_frame->get_style();
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[$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($style->max_height)));
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// Use the specified min width as minimum when width or max width depend
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// on the containing block and cannot be resolved yet. This mimics
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// browser behavior
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$min = $percent_width ? $min_width : $width;
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$max = $width;
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return [$min, $max];
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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 = $frame->get_style();
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$computed_width = $style->width;
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$computed_height = $style->height;
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$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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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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// 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, $max_height);
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if (($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, $max_height);
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}
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return [$width, $height];
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}
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protected function resolve_dimensions(): void
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{
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/** @var ImageFrameDecorator */
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$frame = $this->_frame;
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$style = $frame->get_style();
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$debug_png = $this->get_dompdf()->getOptions()->getDebugPng();
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if ($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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[, , $cbw, $cbh] = $frame->get_containing_block();
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[$width, $height] = $this->calculate_size($cbw, $cbh);
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if ($debug_png) {
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print $width . " " . $height . ";";
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}
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$style->set_used("width", $width);
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$style->set_used("height", $height);
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}
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protected function resolve_margins(): void
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{
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// Only handle the inline case for now
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// https://www.w3.org/TR/CSS21/visudet.html#inline-replaced-width
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// https://www.w3.org/TR/CSS21/visudet.html#inline-replaced-height
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$style = $this->_frame->get_style();
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if ($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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