Add image source plugin

A simple plugin that does nothing more than display an image file as a
source.

plugins/image-source/CMakeLists.txt

@@ -0,0 +1,11 @@
+project(image-source)
+
+set(image-source_SOURCES
+	image-source.c)
+
+add_library(image-source MODULE
+	${image-source_SOURCES})
+target_link_libraries(image-source
+	libobs)
+
+install_obs_plugin(image-source)

plugins/image-source/image-source.c

@@ -0,0 +1,131 @@
+#include <obs-module.h>
+
+#define warn(format, ...) \
+	blog(LOG_WARNING, "[image_source: '%s'] " format, \
+			obs_source_getname(context->source), ##__VA_ARGS__)
+
+struct image_source {
+	obs_source_t source;
+
+	texture_t    tex;
+	uint32_t     cx;
+	uint32_t     cy;
+};
+
+static const char *image_source_get_name(void)
+{
+	/* TODO: locale */
+	return "Image";
+}
+
+static void image_source_update(void *data, obs_data_t settings)
+{
+	struct image_source *context = data;
+	const char *file = obs_data_getstring(settings, "file");
+
+	gs_entercontext(obs_graphics());
+
+	if (context->tex) {
+		texture_destroy(context->tex);
+		context->tex = NULL;
+	}
+
+	if (file) {
+		context->tex = gs_create_texture_from_file(file);
+		if (context->tex) {
+			context->cx = texture_getwidth(context->tex);
+			context->cy = texture_getheight(context->tex);
+		} else {
+			warn("failed to load texture '%s'", file);
+			context->cx = 0;
+			context->cy = 0;
+		}
+	}
+
+	gs_leavecontext();
+}
+
+static void *image_source_create(obs_data_t settings, obs_source_t source)
+{
+	struct image_source *context = bzalloc(sizeof(struct image_source));
+	context->source = source;
+
+	image_source_update(context, settings);
+	return context;
+}
+
+static void image_source_destroy(void *data)
+{
+	struct image_source *context = data;
+
+	gs_entercontext(obs_graphics());
+	texture_destroy(context->tex);
+	gs_leavecontext();
+
+	bfree(context);
+}
+
+static uint32_t image_source_getwidth(void *data)
+{
+	struct image_source *context = data;
+	return context->cx;
+}
+
+static uint32_t image_source_getheight(void *data)
+{
+	struct image_source *context = data;
+	return context->cy;
+}
+
+static void image_source_render(void *data, effect_t effect)
+{
+	struct image_source *context = data;
+	if (!context->tex)
+		return;
+
+	effect_settexture(effect_getparambyname(effect, "image"), context->tex);
+	gs_draw_sprite(context->tex, 0, context->cx, context->cy);
+}
+
+static const char *image_filter =
+	"All formats (*.bmp *.tga *.png *.jpeg *.jpg *.gif);;"
+	"BMP Files (*.bmp);;"
+	"Targa Files (*.tga);;"
+	"PNG Files (*.png);;"
+	"JPEG Files (*.jpeg *.jpg);;"
+	"GIF Files (*.gif)";
+
+static obs_properties_t image_source_properties(void)
+{
+	obs_properties_t props = obs_properties_create();
+
+	/* TODO: locale */
+	obs_properties_add_path(props, "file", "Image file", OBS_PATH_FILE,
+			image_filter, NULL);
+
+	return props;
+}
+
+static struct obs_source_info image_source_info = {
+	.id           = "image_source",
+	.type         = OBS_SOURCE_TYPE_INPUT,
+	.output_flags = OBS_SOURCE_VIDEO,
+	.getname      = image_source_get_name,
+	.create       = image_source_create,
+	.destroy      = image_source_destroy,
+	.update       = image_source_update,
+	.getwidth     = image_source_getwidth,
+	.getheight    = image_source_getheight,
+	.video_render = image_source_render,
+	.properties   = image_source_properties
+};
+
+OBS_DECLARE_MODULE()
+
+bool obs_module_load(uint32_t libobs_version)
+{
+	obs_register_source(&image_source_info);
+
+	UNUSED_PARAMETER(libobs_version);
+	return true;
+}