[PATCH 03/11] introduce image_renderer framework

[Jean-Christophe PLAGNIOL-VILLARD]

This will allow to support bmp and png

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
---
 include/image_renderer.h |  105 ++++++++++++++++++++++++++++++++++++++++++++++
 lib/Kconfig              |    5 +++
 lib/Makefile             |    1 +
 lib/image_renderer.c     |   96 ++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 207 insertions(+)
 create mode 100644 include/image_renderer.h
 create mode 100644 lib/image_renderer.c

diff --git a/include/image_renderer.h b/include/image_renderer.h
new file mode 100644
index 0000000..8604a2a
--- /dev/null
+++ b/include/image_renderer.h
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#ifndef __IMAGE_RENDER_H__
+#define __IMAGE_RENDER_H__
+
+#include <filetype.h>
+#include <linux/list.h>
+#include <errno.h>
+#include <linux/err.h>
+#include <fb.h>
+
+struct image {
+	void *data;
+	struct image_renderer *ir;
+	int height;
+	int width;
+	int bits_per_pixel;
+};
+
+struct image_renderer {
+	enum filetype type;
+	struct image *(*open)(char *data, int size);
+	void (*close)(struct image *img);
+	int (*renderer)(struct fb_info *info, struct image *img, void* fb,
+		int startx, int starty, void* offscreenbuf);
+
+	/*
+	 * do not free the data read from the file
+	 * needed by bmp support
+	 */
+	int keep_file_data;
+
+	struct list_head list;
+};
+
+static inline void set_pixel(struct fb_info *info, void *adr, int r, int g, int b)
+{
+	u32 px;
+
+	px = (r >> (8 - info->red.length)) << info->red.offset |
+		(g >> (8 - info->green.length)) << info->green.offset |
+		(b >> (8 - info->blue.length)) << info->blue.offset;
+
+	switch (info->bits_per_pixel) {
+	case 8:
+		break;
+	case 16:
+		*(u16 *)adr = px;
+		break;
+	case 32:
+		*(u32 *)adr = px;
+		break;
+	}
+}
+
+#ifdef CONFIG_IMAGE_RENDERER
+int image_renderer_register(struct image_renderer *ir);
+void image_render_unregister(struct image_renderer *ir);
+
+int image_renderer_image(struct fb_info *info, struct image *img, void* fb,
+	    int startx, int starty, void* offscreenbuf);
+
+struct image *image_renderer_open(const char* file);
+void image_renderer_close(struct image *img);
+
+#else
+static inline int image_renderer_register(struct image_renderer *ir)
+{
+	return -EINVAL;
+}
+static inline void image_renderer_unregister(struct image_renderer *ir) {}
+
+static inline struct image *image_renderer_open(const char* file)
+{
+	return ERR_PTR(-EINVAL);
+}
+
+static inline void image_renderer_close(struct image *img) {}
+
+int image_renderer_image(struct fb_info *info, struct image *img, void* fb,
+	    int startx, int starty, void* offscreenbuf);
+#endif
+
+static inline int image_renderer_file(struct fb_info *info, const char* file, void* fb,
+		    int startx, int starty, void* offscreenbuf)
+{
+	struct image* img = image_renderer_open(file);
+	int ret;
+
+	if (IS_ERR(img))
+		return PTR_ERR(img);
+
+	ret = image_renderer_image(info, img, fb, startx, starty,
+				offscreenbuf);
+
+	image_renderer_close(img);
+
+	return ret; 
+}
+
+#endif /* __IMAGE_RENDERER_H__ */
diff --git a/lib/Kconfig b/lib/Kconfig
index 93e360b..be3ea1c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -38,6 +38,11 @@ config BITREV
 config QSORT
 	bool
 
+config IMAGE_RENDERER
+	bool
+	depends on VIDEO
+	select FILETYPE
+
 config BMP
 	bool
 
diff --git a/lib/Makefile b/lib/Makefile
index df4b5e5..8fbae8a 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,3 +35,4 @@ obj-$(CONFIG_BCH)	+= bch.o
 obj-$(CONFIG_BITREV)	+= bitrev.o
 obj-$(CONFIG_QSORT)	+= qsort.o
 obj-$(CONFIG_BMP)	+= bmp.o
+obj-$(CONFIG_IMAGE_RENDERER)	+= image_renderer.o
diff --git a/lib/image_renderer.c b/lib/image_renderer.c
new file mode 100644
index 0000000..b08f6bf
--- /dev/null
+++ b/lib/image_renderer.c
@@ -0,0 +1,96 @@
+/*
+ * Copyright (C) 2012 Jean-Christophe PLAGNIOL-VILLARD <plagnioj at jcrosoft.com>
+ *
+ * GPL v2
+ */
+
+#include <common.h>
+#include <fb.h>
+#include <image_renderer.h>
+#include <errno.h>
+#include <fs.h>
+#include <malloc.h>
+
+static LIST_HEAD(image_renderers);
+
+static struct image_renderer *get_renderer(void* buf)
+{
+	struct image_renderer *ir;
+	enum filetype type = file_detect_type(buf);
+
+	list_for_each_entry(ir, &image_renderers, list) {
+		if (ir->type == type)
+			return ir;
+	}
+
+	return NULL;
+}
+
+struct image *image_renderer_open(const char* file)
+{
+	void *data;
+	int size;
+	struct image_renderer *ir;
+	struct image *img;
+	int ret;
+
+	data = read_file(file, &size);
+	if (!data) {
+		printf("unable to read %s\n", file);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	ir = get_renderer(data);
+	if (!ir) {
+		ret = -ENOENT;
+		goto out;
+	}
+
+	img = ir->open(data, size);
+	if (IS_ERR(img)) {
+		ret = PTR_ERR(img);
+		goto out;
+	}
+	img->ir = ir;
+	if (!ir->keep_file_data)
+		free(data);
+
+	return img;
+out:
+	free(data);
+	return ERR_PTR(ret);
+}
+
+void image_renderer_close(struct image *img)
+{
+	if (!img)
+		return;
+
+	img->ir->close(img);
+
+	free(img);
+}
+
+int image_renderer_image(struct fb_info *info, struct image *img, void* fb,
+	    int startx, int starty, void* offscreenbuf)
+{
+	return img->ir->renderer(info, img, fb, startx, starty, offscreenbuf);
+}
+
+int image_renderer_register(struct image_renderer *ir)
+{
+	if (!ir || !ir->type || !ir->renderer || !ir->open || !ir->close)
+		return -EIO;
+
+	list_add_tail(&ir->list, &image_renderers);
+
+	return 0;
+}
+
+void image_renderer_unregister(struct image_renderer *ir)
+{
+	if (!ir)
+		return;
+
+	list_del(&ir->list);
+}
-- 
1.7.10.4