Mercurial > hg > nginx
comparison src/http/modules/ngx_http_image_filter_module.c @ 3134:e6f5cb5eff8b
image_filter_transparency
author | Igor Sysoev <igor@sysoev.ru> |
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date | Tue, 15 Sep 2009 11:55:17 +0000 |
parents | 28a6aa24b453 |
children | fbf6d83ce288 |
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3133:28a6aa24b453 | 3134:e6f5cb5eff8b |
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37 typedef struct { | 37 typedef struct { |
38 ngx_uint_t filter; | 38 ngx_uint_t filter; |
39 ngx_uint_t width; | 39 ngx_uint_t width; |
40 ngx_uint_t height; | 40 ngx_uint_t height; |
41 ngx_int_t jpeg_quality; | 41 ngx_int_t jpeg_quality; |
42 | |
43 ngx_flag_t transparency; | |
42 | 44 |
43 ngx_http_complex_value_t *wcv; | 45 ngx_http_complex_value_t *wcv; |
44 ngx_http_complex_value_t *hcv; | 46 ngx_http_complex_value_t *hcv; |
45 | 47 |
46 size_t buffer_size; | 48 size_t buffer_size; |
111 { ngx_string("image_filter_jpeg_quality"), | 113 { ngx_string("image_filter_jpeg_quality"), |
112 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | 114 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, |
113 ngx_conf_set_num_slot, | 115 ngx_conf_set_num_slot, |
114 NGX_HTTP_LOC_CONF_OFFSET, | 116 NGX_HTTP_LOC_CONF_OFFSET, |
115 offsetof(ngx_http_image_filter_conf_t, jpeg_quality), | 117 offsetof(ngx_http_image_filter_conf_t, jpeg_quality), |
118 NULL }, | |
119 | |
120 { ngx_string("image_filter_transparency"), | |
121 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG, | |
122 ngx_conf_set_flag_slot, | |
123 NGX_HTTP_LOC_CONF_OFFSET, | |
124 offsetof(ngx_http_image_filter_conf_t, transparency), | |
116 NULL }, | 125 NULL }, |
117 | 126 |
118 { ngx_string("image_filter_buffer"), | 127 { ngx_string("image_filter_buffer"), |
119 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | 128 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, |
120 ngx_conf_set_size_slot, | 129 ngx_conf_set_size_slot, |
676 | 685 |
677 | 686 |
678 static ngx_buf_t * | 687 static ngx_buf_t * |
679 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) | 688 ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx) |
680 { | 689 { |
681 int sx, sy, dx, dy, ox, oy, | 690 int sx, sy, dx, dy, ox, oy, size, |
682 colors, transparent, red, green, blue, size; | 691 colors, palette, transparent, |
692 red, green, blue; | |
683 u_char *out; | 693 u_char *out; |
684 ngx_buf_t *b; | 694 ngx_buf_t *b; |
685 ngx_uint_t resize; | 695 ngx_uint_t resize; |
686 gdImagePtr src, dst; | 696 gdImagePtr src, dst; |
687 ngx_pool_cleanup_t *cln; | 697 ngx_pool_cleanup_t *cln; |
704 gdImageDestroy(src); | 714 gdImageDestroy(src); |
705 return ngx_http_image_asis(r, ctx); | 715 return ngx_http_image_asis(r, ctx); |
706 } | 716 } |
707 | 717 |
708 colors = gdImageColorsTotal(src); | 718 colors = gdImageColorsTotal(src); |
709 transparent = gdImageGetTransparent(src); | 719 |
710 | 720 if (colors && conf->transparency) { |
711 if (transparent != -1 && colors) { | 721 transparent = gdImageGetTransparent(src); |
712 red = gdImageRed(src, transparent); | 722 |
713 green = gdImageGreen(src, transparent); | 723 if (transparent != -1) { |
714 blue = gdImageBlue(src, transparent); | 724 palette = colors; |
715 gdImageColorTransparent(src, -1); | 725 red = gdImageRed(src, transparent); |
716 | 726 green = gdImageGreen(src, transparent); |
717 } else { | 727 blue = gdImageBlue(src, transparent); |
718 red = 0; green = 0; blue = 0; | 728 |
719 } | 729 goto transparent; |
730 } | |
731 } | |
732 | |
733 palette = 0; | |
734 transparent = -1; | |
735 red = 0; | |
736 green = 0; | |
737 blue = 0; | |
738 | |
739 transparent: | |
740 | |
741 gdImageColorTransparent(src, -1); | |
720 | 742 |
721 dx = sx; | 743 dx = sx; |
722 dy = sy; | 744 dy = sy; |
723 | 745 |
724 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { | 746 if (conf->filter == NGX_HTTP_IMAGE_RESIZE) { |
760 } | 782 } |
761 } | 783 } |
762 } | 784 } |
763 | 785 |
764 if (resize) { | 786 if (resize) { |
765 dst = ngx_http_image_new(r, dx, dy, colors); | 787 dst = ngx_http_image_new(r, dx, dy, palette); |
766 if (dst == NULL) { | 788 if (dst == NULL) { |
767 gdImageDestroy(src); | 789 gdImageDestroy(src); |
768 return NULL; | 790 return NULL; |
769 } | 791 } |
770 | 792 |
772 gdImageSaveAlpha(dst, 1); | 794 gdImageSaveAlpha(dst, 1); |
773 gdImageAlphaBlending(dst, 0); | 795 gdImageAlphaBlending(dst, 0); |
774 } | 796 } |
775 | 797 |
776 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); | 798 gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy); |
799 | |
800 if (colors) { | |
801 gdImageTrueColorToPalette(dst, 1, 256); | |
802 } | |
777 | 803 |
778 gdImageDestroy(src); | 804 gdImageDestroy(src); |
779 | 805 |
780 } else { | 806 } else { |
781 dst = src; | 807 dst = src; |
819 gdImageSaveAlpha(dst, 1); | 845 gdImageSaveAlpha(dst, 1); |
820 gdImageAlphaBlending(dst, 0); | 846 gdImageAlphaBlending(dst, 0); |
821 } | 847 } |
822 | 848 |
823 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); | 849 gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy); |
850 | |
851 if (colors) { | |
852 gdImageTrueColorToPalette(dst, 1, 256); | |
853 } | |
824 | 854 |
825 gdImageDestroy(src); | 855 gdImageDestroy(src); |
826 } | 856 } |
827 } | 857 } |
828 | 858 |
1029 return NULL; | 1059 return NULL; |
1030 } | 1060 } |
1031 | 1061 |
1032 conf->filter = NGX_CONF_UNSET_UINT; | 1062 conf->filter = NGX_CONF_UNSET_UINT; |
1033 conf->jpeg_quality = NGX_CONF_UNSET; | 1063 conf->jpeg_quality = NGX_CONF_UNSET; |
1064 conf->transparency = NGX_CONF_UNSET; | |
1034 conf->buffer_size = NGX_CONF_UNSET_SIZE; | 1065 conf->buffer_size = NGX_CONF_UNSET_SIZE; |
1035 | 1066 |
1036 return conf; | 1067 return conf; |
1037 } | 1068 } |
1038 | 1069 |
1058 } | 1089 } |
1059 | 1090 |
1060 /* 75 is libjpeg default quality */ | 1091 /* 75 is libjpeg default quality */ |
1061 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75); | 1092 ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75); |
1062 | 1093 |
1094 ngx_conf_merge_value(conf->transparency, prev->transparency, 1); | |
1095 | |
1063 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, | 1096 ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size, |
1064 1 * 1024 * 1024); | 1097 1 * 1024 * 1024); |
1065 | 1098 |
1066 return NGX_CONF_OK; | 1099 return NGX_CONF_OK; |
1067 } | 1100 } |