From 0353e6eea265f5f6fa53eb75300529d9ffa6d4fa Mon Sep 17 00:00:00 2001 From: András Mohari Date: Wed, 13 Nov 2013 20:54:09 +0100 Subject: Add support for changing the gamma value --- image.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'image.c') diff --git a/image.c b/image.c index ec248e1..b1c7851 100644 --- a/image.c +++ b/image.c @@ -67,6 +67,9 @@ void img_init(img_t *img, win_t *win) img->alpha = !RENDER_WHITE_ALPHA; img->multi.cap = img->multi.cnt = 0; img->multi.animate = false; + + img->cmod = imlib_create_color_modifier(); + img_set_gamma(img, options->gamma); } void exif_auto_orientate(const fileinfo_t *file) @@ -303,6 +306,8 @@ bool img_load(img_t *img, const fileinfo_t *file) img_load_gif(img, file); #endif + img_set_gamma(img, img->gamma); + img->w = imlib_image_get_width(); img->h = imlib_image_get_height(); img->scalemode = options->scalemode; @@ -335,6 +340,9 @@ void img_close(img_t *img, bool decache) imlib_free_image(); img->im = NULL; } + + if (img->cmod) + imlib_context_set_color_modifier(NULL); } void img_check_pan(img_t *img, bool moved) @@ -706,6 +714,28 @@ void img_toggle_antialias(img_t *img) img->dirty = true; } +void img_set_gamma(img_t *img, int gamma) +{ + if (img == NULL) + return; + + img->gamma = MIN(MAX(gamma, -GAMMA_RANGE), GAMMA_RANGE); + + if (img->im && img->cmod) { + if (img->gamma == 0) { + imlib_context_set_color_modifier(NULL); + } else { + double range = img->gamma <= 0 ? 1.0 : GAMMA_MAX - 1.0; + imlib_context_set_color_modifier(img->cmod); + imlib_reset_color_modifier(); + imlib_modify_color_modifier_gamma( + 1.0 + (double) img->gamma + * (range / (double) GAMMA_RANGE)); + } + img->dirty = true; + } +} + bool img_frame_goto(img_t *img, int n) { if (img == NULL || img->im == NULL) -- cgit v1.2.3-54-g00ecf