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image_filter_transparency

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This commit is contained in:
Igor Sysoev 2009-09-15 11:55:17 +00:00
parent f1edf87d04
commit 4428cfc12b
1 changed files with 44 additions and 11 deletions
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47
src/http/modules/ngx_http_image_filter_module.c
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@ -40,6 +40,8 @@ typedef struct {
ngx_uint_t height;
ngx_int_t jpeg_quality;
ngx_flag_t transparency;
ngx_http_complex_value_t *wcv;
ngx_http_complex_value_t *hcv;
@ -115,6 +117,13 @@ static ngx_command_t ngx_http_image_filter_commands[] = {
offsetof(ngx_http_image_filter_conf_t, jpeg_quality),
NULL },
{ ngx_string("image_filter_transparency"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_image_filter_conf_t, transparency),
NULL },
{ ngx_string("image_filter_buffer"),
NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
@ -678,8 +687,9 @@ ngx_http_image_size(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
static ngx_buf_t *
ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
{
int sx, sy, dx, dy, ox, oy,
colors, transparent, red, green, blue, size;
int sx, sy, dx, dy, ox, oy, size,
colors, palette, transparent,
red, green, blue;
u_char *out;
ngx_buf_t *b;
ngx_uint_t resize;
@ -706,17 +716,29 @@ ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
}
colors = gdImageColorsTotal(src);
if (colors && conf->transparency) {
transparent = gdImageGetTransparent(src);
if (transparent != -1 && colors) {
if (transparent != -1) {
palette = colors;
red = gdImageRed(src, transparent);
green = gdImageGreen(src, transparent);
blue = gdImageBlue(src, transparent);
gdImageColorTransparent(src, -1);
} else {
red = 0; green = 0; blue = 0;
goto transparent;
}
}
palette = 0;
transparent = -1;
red = 0;
green = 0;
blue = 0;
transparent:
gdImageColorTransparent(src, -1);
dx = sx;
dy = sy;
@ -762,7 +784,7 @@ ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
}
if (resize) {
dst = ngx_http_image_new(r, dx, dy, colors);
dst = ngx_http_image_new(r, dx, dy, palette);
if (dst == NULL) {
gdImageDestroy(src);
return NULL;
@ -775,6 +797,10 @@ ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
gdImageCopyResampled(dst, src, 0, 0, 0, 0, dx, dy, sx, sy);
if (colors) {
gdImageTrueColorToPalette(dst, 1, 256);
}
gdImageDestroy(src);
} else {
@ -822,6 +848,10 @@ ngx_http_image_resize(ngx_http_request_t *r, ngx_http_image_filter_ctx_t *ctx)
gdImageCopy(dst, src, 0, 0, ox, oy, dx - ox, dy - oy);
if (colors) {
gdImageTrueColorToPalette(dst, 1, 256);
}
gdImageDestroy(src);
}
}
@ -1031,6 +1061,7 @@ ngx_http_image_filter_create_conf(ngx_conf_t *cf)
conf->filter = NGX_CONF_UNSET_UINT;
conf->jpeg_quality = NGX_CONF_UNSET;
conf->transparency = NGX_CONF_UNSET;
conf->buffer_size = NGX_CONF_UNSET_SIZE;
return conf;
@ -1060,6 +1091,8 @@ ngx_http_image_filter_merge_conf(ngx_conf_t *cf, void *parent, void *child)
/* 75 is libjpeg default quality */
ngx_conf_merge_value(conf->jpeg_quality, prev->jpeg_quality, 75);
ngx_conf_merge_value(conf->transparency, prev->transparency, 1);
ngx_conf_merge_size_value(conf->buffer_size, prev->buffer_size,
1 * 1024 * 1024);