/* GStreamer * Copyright (C) 2018 Matthew Waters * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ /* * This file was modified from the alpha element and converted to OpenGL */ /** * SECTION:element-glalpha * @title: glalpha * * The glalpha element adds an alpha channel to a video stream. The values * of the alpha channel can be either be set to a constant or can be * dynamically calculated via chroma keying, e.g. blue can be set as * the transparent color. * * Sample pipeline: * |[ * gst-launch-1.0 gltestsrc pattern=snow ! mixer.sink_0 \ * gltestsrc pattern=smpte ! glalpha method=green ! mixer.sink_1 \ * glvideomixer name=mixer sink_0::zorder=0 sink_1::zorder=1 ! \ * glimagesink * ]| This pipeline adds a alpha channel to the SMPTE color bars * with green as the transparent color and overlays the output on * top of a snow video stream. * */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include "gstglalpha.h" #include #include #include #ifndef M_PI #define M_PI 3.14159265358979323846 #endif GST_DEBUG_CATEGORY_STATIC (glalpha_debug); #define GST_CAT_DEFAULT glalpha_debug #define GST_TYPE_GL_ALPHA_METHOD (gst_gl_alpha_method_get_type()) static GType gst_gl_alpha_method_get_type (void) { static GType alpha_method_type = 0; static const GEnumValue alpha_method[] = { {ALPHA_METHOD_SET, "Set/adjust alpha channel", "set"}, {ALPHA_METHOD_GREEN, "Chroma Key on pure green", "green"}, {ALPHA_METHOD_BLUE, "Chroma Key on pure blue", "blue"}, {ALPHA_METHOD_CUSTOM, "Chroma Key on custom RGB values", "custom"}, {0, NULL, NULL}, }; if (!alpha_method_type) { alpha_method_type = g_enum_register_static ("GstGLAlphaMethod", alpha_method); } return alpha_method_type; } /* GstGLAlpha properties */ #define DEFAULT_METHOD ALPHA_METHOD_SET #define DEFAULT_ALPHA 1.0 #define DEFAULT_TARGET_R 0 #define DEFAULT_TARGET_G 255 #define DEFAULT_TARGET_B 0 #define DEFAULT_ANGLE 20.0 #define DEFAULT_NOISE_LEVEL 2.0 #define DEFAULT_BLACK_SENSITIVITY 100 #define DEFAULT_WHITE_SENSITIVITY 100 enum { PROP_0, PROP_METHOD, PROP_ALPHA, PROP_TARGET_R, PROP_TARGET_G, PROP_TARGET_B, PROP_ANGLE, PROP_NOISE_LEVEL, PROP_BLACK_SENSITIVITY, PROP_WHITE_SENSITIVITY, }; /* *INDENT-OFF* */ static const gchar *alpha_frag = "varying vec2 v_texcoord;\n" "uniform sampler2D tex;\n" "uniform float alpha;\n" "void main () {\n" " vec4 rgba = texture2D (tex, v_texcoord);\n" " rgba.a = alpha;\n" " gl_FragColor = rgba;\n" "}\n"; static const gchar *chroma_key_frag = "varying vec2 v_texcoord;\n" "uniform sampler2D tex;\n" "uniform float cb;\n" "uniform float cr;\n" "uniform float kg;\n" "uniform float accept_angle_tg;\n" "uniform float accept_angle_ctg;\n" "uniform float one_over_kc;\n" "uniform float kfgy_scale;\n" "uniform float noise_level2;\n" "uniform float smin;\n" "uniform float smax;\n" /* these values are taken from the alpha element and divided by 256 to * get the floating point numbers below. * XXX: They are different from the values produced by videoconvert and used * by glcolorconvert 298, 0, 409, -57068, 298, -100, -208, 34707, 298, 516, 0, -70870, */ "#define from_yuv_bt601_offset vec3(-0.0625, -0.5, -0.5)\n" "#define from_yuv_bt601_rcoeff vec3(1.1640625, 0.000, 1.787)\n" "#define from_yuv_bt601_gcoeff vec3(1.1640625,-0.213,-0.531)\n" "#define from_yuv_bt601_bcoeff vec3(1.1640625, 2.112, 0.000)\n" /* these values are taken from the alpha element and divided by 256 to * get the floating point numbers below * XXX: They are different from the values produced by videoconvert and used * by glcolorconvert 66, 129, 25, 4096, -38, -74, 112, 32768, 112, -94, -18, 32768, */ "#define from_rgb_bt601_offset vec3(0.0625, 0.5, 0.5)\n" "#define from_rgb_bt601_ycoeff vec3( 0.2578125, 0.50390625, 0.09765625)\n" "#define from_rgb_bt601_ucoeff vec3(-0.1484375,-0.28906250, 0.43750000)\n" "#define from_rgb_bt601_vcoeff vec3( 0.4375000,-0.36718750,-0.07031250)\n" "#define PI 3.14159265\n" "\n" "vec3 yuv_to_rgb (vec3 val) {\n" " vec3 rgb;\n" " val += from_yuv_bt601_offset;\n" " rgb.r = dot(val, from_yuv_bt601_rcoeff);\n" " rgb.g = dot(val, from_yuv_bt601_gcoeff);\n" " rgb.b = dot(val, from_yuv_bt601_bcoeff);\n" " return rgb;\n" "}\n" "vec3 rgb_to_yuv (vec3 val) {\n" " vec3 yuv;\n" " yuv.r = dot(val.rgb, from_rgb_bt601_ycoeff);\n" " yuv.g = dot(val.rgb, from_rgb_bt601_ucoeff);\n" " yuv.b = dot(val.rgb, from_rgb_bt601_vcoeff);\n" " yuv += from_rgb_bt601_offset;\n" " return yuv;\n" "}\n" "vec4 chroma_keying_yuv (vec4 yuva) {\n" " float y, u, v;\n" " y = yuva.x;\n" " u = yuva.y-0.5;\n" " v = yuva.z-0.5;\n" " if (y < smin || y > smax) {\n" " return yuva;\n" " }\n" " vec4 new;\n" " float tmp, tmp1;\n" " float x = clamp ((u * cb + v * cr) * 2.0, -0.5, 0.5);\n" " float z = clamp ((v * cb - u * cr) * 2.0, -0.5, 0.5);\n" " if (abs(z) > min (0.5, x * accept_angle_tg * 0.0625)) {\n" " return yuva;\n" " }\n" " float x1 = min (0.5, abs(z * accept_angle_ctg * 0.0625));\n" " float y1 = z;\n" " tmp1 = max (0.0, x-x1);\n" " float b_alpha = yuva.a * (1.0 - clamp (tmp1 * one_over_kc, 0.0, 1.0));\n" " tmp = min (1.0, tmp1 * kfgy_scale * 0.0625);\n" " new.x = max (y-tmp, 0.0);//y < tmp ? 0.0 : y - tmp;\n" " new.y = clamp ((x1 * cb - y1 * cr) * 2.0, -0.5, 0.5)+0.5;\n" " new.z = clamp ((y1 * cb + x1 * cr) * 2.0, -0.5, 0.5)+0.5;\n" " new.a = z * z + (x - kg) * (x - kg) < noise_level2 ? 0.0 : b_alpha;\n" " return new;\n" "}\n" "void main () {\n" " vec4 yuva;\n" /* operations translated from alpha and tested with glvideomixer * with one pad's paremeters blend-equation-rgb={subtract,reverse-subtract}, * blend-function-src-rgb=src-color and blend-function-dst-rgb=dst-color */ " vec4 rgba = texture2D (tex, v_texcoord);\n" " yuva.xyz = rgb_to_yuv (rgba.rgb);\n" " yuva.a = rgba.a;\n" " yuva = chroma_keying_yuv (yuva);\n" " rgba.rgb = yuv_to_rgb (yuva.xyz);\n" " rgba.a = yuva.a;\n" " gl_FragColor = rgba;\n" "}\n"; /* *INDENT-ON* */ static const gfloat cog_rgb_to_ycbcr_matrix_8bit_sdtv[] = { 0.2578125, 0.50390625, 0.09765625, 0.0625f, -0.1484375, -0.28906250, 0.43750000, 0.5f, 0.4375000, -0.36718750, -0.07031250, 0.5f }; static void gst_gl_alpha_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec); static void gst_gl_alpha_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec); #define gst_gl_alpha_parent_class parent_class G_DEFINE_TYPE (GstGLAlpha, gst_gl_alpha, GST_TYPE_GL_FILTER); static gboolean gst_gl_alpha_is_passthrough (GstGLAlpha * glalpha) { return glalpha->method == ALPHA_METHOD_SET && glalpha->alpha == 1.0; } /* move v to be inside [from, to] by some multiple of (to-from) */ static float wrap (float v, float from, float to) { float diff; if (from > to) { float t = to; to = from; from = t; } if (!isfinite (to) || !isfinite (from) || !isfinite (v)) return v; diff = to - from; while (v < from) v += diff; while (v > to) v -= diff; return v; } static void gst_gl_alpha_update_properties (GstGLAlpha * glalpha) { GstBaseTransform *base = GST_BASE_TRANSFORM (glalpha); gboolean current_passthrough, passthrough; gfloat kgl; gfloat tmp; gfloat target_r, target_g, target_b; gfloat target_y, target_u, target_v; const float *matrix = cog_rgb_to_ycbcr_matrix_8bit_sdtv; GST_OBJECT_LOCK (glalpha); switch (glalpha->method) { case ALPHA_METHOD_GREEN: target_r = 0.0; target_g = 1.0; target_b = 0.0; break; case ALPHA_METHOD_BLUE: target_r = 0.0; target_g = 0.0; target_b = 1.0; break; default: target_r = (gfloat) glalpha->target_r / 255.0; target_g = (gfloat) glalpha->target_g / 255.0; target_b = (gfloat) glalpha->target_b / 255.0; break; } target_y = matrix[0] * target_r + matrix[1] * target_g + matrix[2] * target_b + matrix[3]; /* Cb,Cr without offset here because the chroma keying * works with them being in range [-128,127] */ target_u = matrix[4] * target_r + matrix[5] * target_g + matrix[6] * target_b; target_v = matrix[8] * target_r + matrix[9] * target_g + matrix[10] * target_b; tmp = target_u * target_u + target_v * target_v; kgl = sqrt (tmp); glalpha->cb = target_u / kgl * 0.5; glalpha->cr = target_v / kgl * 0.5; tmp = 15 * tan (M_PI * glalpha->angle / 180); tmp = MIN (tmp, 255); glalpha->accept_angle_tg = tmp; tmp = 15 / tan (M_PI * glalpha->angle / 180); tmp = MIN (tmp, 255); glalpha->accept_angle_ctg = tmp; glalpha->one_over_kc = wrap (2 / kgl - 255, 0, 256); tmp = 15 * target_y / kgl; tmp = MIN (tmp, 255); glalpha->kfgy_scale = tmp; glalpha->kg = MIN (kgl, 0.5); glalpha->noise_level2 = glalpha->noise_level / 256.0 * glalpha->noise_level / 256.0; GST_INFO_OBJECT (glalpha, "target yuv: %f, %f, %f, " "kgl: %f, cb: %f, cr: %f, accept_angle_tg: %f, accept_angle_ctg: %f, " "one_over_kc: %f, kgfy_scale: %f, kg: %f, noise level: %f", (float) target_y, (float) target_u, (float) target_v, (float) kgl, (float) glalpha->cb, (float) glalpha->cr, (float) glalpha->accept_angle_tg, (float) glalpha->accept_angle_ctg, (float) glalpha->one_over_kc, (float) glalpha->kfgy_scale, (float) glalpha->kg, (float) glalpha->noise_level2); passthrough = gst_gl_alpha_is_passthrough (glalpha); GST_OBJECT_UNLOCK (glalpha); current_passthrough = gst_base_transform_is_passthrough (base); gst_base_transform_set_passthrough (base, passthrough); if (current_passthrough != passthrough) gst_base_transform_reconfigure_src (base); } static gboolean _create_shader (GstGLAlpha * alpha) { GstGLBaseFilter *base_filter = GST_GL_BASE_FILTER (alpha); GstGLFilter *filter = GST_GL_FILTER (alpha); GError *error = NULL; const gchar *frags[2]; if (alpha->alpha_shader) gst_object_unref (alpha->alpha_shader); frags[0] = gst_gl_shader_string_get_highest_precision (base_filter->context, GST_GLSL_VERSION_NONE, GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY); frags[1] = alpha_frag; if (!(alpha->alpha_shader = gst_gl_shader_new_link_with_stages (base_filter->context, &error, gst_glsl_stage_new_default_vertex (base_filter->context), gst_glsl_stage_new_with_strings (base_filter->context, GL_FRAGMENT_SHADER, GST_GLSL_VERSION_NONE, GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY, 2, frags), NULL))) { GST_ELEMENT_ERROR (alpha, RESOURCE, NOT_FOUND, ("%s", "Failed to initialize alpha shader"), ("%s", error ? error->message : "Unknown error")); return FALSE; } if (alpha->chroma_key_shader) gst_object_unref (alpha->chroma_key_shader); frags[1] = chroma_key_frag; if (!(alpha->chroma_key_shader = gst_gl_shader_new_link_with_stages (base_filter->context, &error, gst_glsl_stage_new_default_vertex (base_filter->context), gst_glsl_stage_new_with_strings (base_filter->context, GL_FRAGMENT_SHADER, GST_GLSL_VERSION_NONE, GST_GLSL_PROFILE_ES | GST_GLSL_PROFILE_COMPATIBILITY, 2, frags), NULL))) { GST_ELEMENT_ERROR (alpha, RESOURCE, NOT_FOUND, ("%s", "Failed to initialize chroma key shader"), ("%s", error ? error->message : "Unknown error")); return FALSE; } filter->draw_attr_position_loc = gst_gl_shader_get_attribute_location (alpha->alpha_shader, "a_position"); filter->draw_attr_texture_loc = gst_gl_shader_get_attribute_location (alpha->alpha_shader, "a_texcoord"); return TRUE; } static gboolean gst_gl_alpha_gl_start (GstGLBaseFilter * base_filter) { GstGLAlpha *alpha = GST_GL_ALPHA (base_filter); if (!_create_shader (alpha)) return FALSE; return GST_GL_BASE_FILTER_CLASS (parent_class)->gl_start (base_filter); } static void gst_gl_alpha_gl_stop (GstGLBaseFilter * base_filter) { GstGLAlpha *alpha = GST_GL_ALPHA (base_filter); if (alpha->alpha_shader) gst_object_unref (alpha->alpha_shader); alpha->alpha_shader = NULL; if (alpha->chroma_key_shader) gst_object_unref (alpha->chroma_key_shader); alpha->chroma_key_shader = NULL; GST_GL_BASE_FILTER_CLASS (parent_class)->gl_stop (base_filter); } static void gst_gl_alpha_before_transform (GstBaseTransform * base, GstBuffer * buf) { GstGLAlpha *alpha = GST_GL_ALPHA (base); GstClockTime timestamp, stream_time; timestamp = GST_BUFFER_TIMESTAMP (buf); stream_time = gst_segment_to_stream_time (&base->segment, GST_FORMAT_TIME, timestamp); GST_DEBUG_OBJECT (alpha, "sync to %" GST_TIME_FORMAT, GST_TIME_ARGS (timestamp)); if (GST_CLOCK_TIME_IS_VALID (stream_time)) gst_object_sync_values (GST_OBJECT (alpha), stream_time); } static gboolean gst_gl_alpha_filter_texture (GstGLFilter * filter, GstGLMemory * in_tex, GstGLMemory * out_tex) { GstGLAlpha *alpha = GST_GL_ALPHA (filter); GstGLShader *shader; if (!alpha->alpha_shader) _create_shader (alpha); GST_OBJECT_LOCK (alpha); if (alpha->method == ALPHA_METHOD_SET) { shader = alpha->alpha_shader; gst_gl_shader_use (shader); gst_gl_shader_set_uniform_1f (shader, "alpha", alpha->alpha); } else { shader = alpha->chroma_key_shader; gst_gl_shader_use (shader); gst_gl_shader_set_uniform_1f (shader, "cb", alpha->cb); gst_gl_shader_set_uniform_1f (shader, "cr", alpha->cr); gst_gl_shader_set_uniform_1f (shader, "kg", alpha->kg); gst_gl_shader_set_uniform_1f (shader, "accept_angle_tg", alpha->accept_angle_tg); gst_gl_shader_set_uniform_1f (shader, "accept_angle_ctg", alpha->accept_angle_ctg); gst_gl_shader_set_uniform_1f (shader, "one_over_kc", alpha->one_over_kc); gst_gl_shader_set_uniform_1f (shader, "kfgy_scale", alpha->kfgy_scale); gst_gl_shader_set_uniform_1f (shader, "noise_level2", alpha->noise_level2); gst_gl_shader_set_uniform_1f (shader, "smin", 0.5 - alpha->black_sensitivity / 255.0); gst_gl_shader_set_uniform_1f (shader, "smax", 0.5 + alpha->white_sensitivity / 255.0); } GST_OBJECT_UNLOCK (alpha); gst_gl_filter_render_to_target_with_shader (filter, in_tex, out_tex, shader); return TRUE; } static void gst_gl_alpha_class_init (GstGLAlphaClass * klass) { GObjectClass *gobject_class = (GObjectClass *) klass; GstElementClass *gstelement_class = (GstElementClass *) klass; GstBaseTransformClass *trans_class = (GstBaseTransformClass *) klass; GstGLBaseFilterClass *base_filter_class = (GstGLBaseFilterClass *) klass; GstGLFilterClass *filter_class = (GstGLFilterClass *) klass; GST_DEBUG_CATEGORY_INIT (glalpha_debug, "glalpha", 0, "glalpha"); gst_gl_filter_add_rgba_pad_templates (GST_GL_FILTER_CLASS (klass)); gobject_class->set_property = gst_gl_alpha_set_property; gobject_class->get_property = gst_gl_alpha_get_property; g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_METHOD, g_param_spec_enum ("method", "Method", "How the alpha channels should be created", GST_TYPE_GL_ALPHA_METHOD, DEFAULT_METHOD, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ALPHA, g_param_spec_double ("alpha", "Alpha", "The value for the alpha channel", 0.0, 1.0, DEFAULT_ALPHA, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_R, g_param_spec_uint ("target-r", "Target Red", "The red color value for custom RGB chroma keying", 0, 255, DEFAULT_TARGET_R, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_G, g_param_spec_uint ("target-g", "Target Green", "The green color value for custom RGB chroma keying", 0, 255, DEFAULT_TARGET_G, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_TARGET_B, g_param_spec_uint ("target-b", "Target Blue", "The blue color value for custom RGB chroma keying", 0, 255, DEFAULT_TARGET_B, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_ANGLE, g_param_spec_float ("angle", "Angle", "Size of the colorcube to change", 0.0, 90.0, DEFAULT_ANGLE, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_NOISE_LEVEL, g_param_spec_float ("noise-level", "Noise Level", "Size of noise radius", 0.0, 64.0, DEFAULT_NOISE_LEVEL, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BLACK_SENSITIVITY, g_param_spec_uint ("black-sensitivity", "Black Sensitivity", "Sensitivity to dark colors", 0, 128, DEFAULT_BLACK_SENSITIVITY, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_WHITE_SENSITIVITY, g_param_spec_uint ("white-sensitivity", "White Sensitivity", "Sensitivity to bright colors", 0, 128, DEFAULT_WHITE_SENSITIVITY, G_PARAM_READWRITE | GST_PARAM_CONTROLLABLE | G_PARAM_STATIC_STRINGS)); gst_element_class_set_static_metadata (gstelement_class, "OpenGL Alpha Filter", "Filter/Effect/Video", "Adds an alpha channel to video using OpenGL - uniform or chroma-keying", "Matthew Waters "); trans_class->before_transform = GST_DEBUG_FUNCPTR (gst_gl_alpha_before_transform); trans_class->transform_ip_on_passthrough = FALSE; base_filter_class->gl_start = GST_DEBUG_FUNCPTR (gst_gl_alpha_gl_start); base_filter_class->gl_stop = GST_DEBUG_FUNCPTR (gst_gl_alpha_gl_stop); filter_class->filter_texture = GST_DEBUG_FUNCPTR (gst_gl_alpha_filter_texture); } static void gst_gl_alpha_init (GstGLAlpha * alpha) { alpha->alpha = DEFAULT_ALPHA; alpha->method = DEFAULT_METHOD; alpha->target_r = DEFAULT_TARGET_R; alpha->target_g = DEFAULT_TARGET_G; alpha->target_b = DEFAULT_TARGET_B; alpha->angle = DEFAULT_ANGLE; alpha->noise_level = DEFAULT_NOISE_LEVEL; alpha->black_sensitivity = DEFAULT_BLACK_SENSITIVITY; alpha->white_sensitivity = DEFAULT_WHITE_SENSITIVITY; gst_gl_alpha_update_properties (alpha); } static void gst_gl_alpha_set_property (GObject * object, guint prop_id, const GValue * value, GParamSpec * pspec) { GstGLAlpha *alpha = GST_GL_ALPHA (object); GST_OBJECT_LOCK (alpha); switch (prop_id) { case PROP_METHOD:{ alpha->method = g_value_get_enum (value); break; } case PROP_ALPHA:{ alpha->alpha = g_value_get_double (value); break; } case PROP_TARGET_R: alpha->target_r = g_value_get_uint (value); break; case PROP_TARGET_G: alpha->target_g = g_value_get_uint (value); break; case PROP_TARGET_B: alpha->target_b = g_value_get_uint (value); break; case PROP_ANGLE: alpha->angle = g_value_get_float (value); break; case PROP_NOISE_LEVEL: alpha->noise_level = g_value_get_float (value); break; case PROP_BLACK_SENSITIVITY: alpha->black_sensitivity = g_value_get_uint (value); break; case PROP_WHITE_SENSITIVITY: alpha->white_sensitivity = g_value_get_uint (value); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } GST_OBJECT_UNLOCK (alpha); gst_gl_alpha_update_properties (alpha); } static void gst_gl_alpha_get_property (GObject * object, guint prop_id, GValue * value, GParamSpec * pspec) { GstGLAlpha *alpha = GST_GL_ALPHA (object); switch (prop_id) { case PROP_METHOD: g_value_set_enum (value, alpha->method); break; case PROP_ALPHA: g_value_set_double (value, alpha->alpha); break; case PROP_TARGET_R: g_value_set_uint (value, alpha->target_r); break; case PROP_TARGET_G: g_value_set_uint (value, alpha->target_g); break; case PROP_TARGET_B: g_value_set_uint (value, alpha->target_b); break; case PROP_ANGLE: g_value_set_float (value, alpha->angle); break; case PROP_NOISE_LEVEL: g_value_set_float (value, alpha->noise_level); break; case PROP_BLACK_SENSITIVITY: g_value_set_uint (value, alpha->black_sensitivity); break; case PROP_WHITE_SENSITIVITY: g_value_set_uint (value, alpha->white_sensitivity); break; default: G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); break; } }