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Adaptive Images Twitter Bootstrap Ready #125

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Adaptive Images Twitter Bootstrap Ready #125

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b29b542
[CHANGES] Ready for Twitter Bootstrap
kollinger Jun 27, 2013
f022c79
[FIX] Revert Tab-Indent to original
kollinger Jun 27, 2013
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28 changes: 26 additions & 2 deletions adaptive-images.php
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Original file line number Diff line number Diff line change
Expand Up @@ -12,7 +12,13 @@

/* CONFIG ----------------------------------------------------------------------------------------------------------- */

$resolutions = array(1382, 992, 768, 480); // the resolution break-points to use (screen widths, in pixels)
/* Twitter Bootstrap Setup
NOTE: All relevant images have to be in folders named by their bootstrap span-size-classes. E.g. /img/span8/image.jpg
gerhard@kollinger.it */
$column_widths = array(70, 60, 42);
$gutter_widths = array(30, 20, 20);
$resolutions = array(5000, 1199, 979, 767, 479); // the resolution break-points to use (screen widths, in pixels)

$cache_path = "ai-cache"; // where to store the generated re-sized images. Specify from your document root!
$jpg_quality = 75; // the quality of any generated JPGs on a scale of 0 to 100
$sharpen = TRUE; // Shrinking images can blur details, perform a sharpen on re-scaled images?
Expand Down Expand Up @@ -131,7 +137,7 @@ function refreshCache($source_file, $cache_file, $resolution) {

/* generates the given cache file for the given source file with the given resolution */
function generateImage($source_file, $cache_file, $resolution) {
global $sharpen, $jpg_quality;
global $sharpen, $jpg_quality, $resolutions, $column_widths, $gutter_widths;

$extension = strtolower(pathinfo($source_file, PATHINFO_EXTENSION));

Expand All @@ -140,6 +146,24 @@ function generateImage($source_file, $cache_file, $resolution) {
$width = $dimensions[0];
$height = $dimensions[1];

// Get column size
preg_match_all('#/span([0-9]+)/#', $source_file, $matches);
$span = isset($matches[1][0]) ? $matches[1][0] : FALSE;
if ( ! $span) {
return $source_file;
}

// Get column and gutter width
$resolutions_key = array_search($resolution, $resolutions);
if($resolutions_key === FALSE) {
return $source_file;
}
$column_width = $column_widths[$resolutions_key];
$gutter_width = isset($gutter_widths[$resolutions_key]) ? $gutter_widths[$resolutions_key] : 0;

// Get image width for column
$resolution = $column_width ? $span * $column_width + ($span - 1) * $gutter_width : $resolution;

// Do we need to downscale the image?
if ($width <= $resolution) { // no, because the width of the source image is already less than the client width
return $source_file;
Expand Down