Metadata display support - patch by Julian and me.

Basically, blender adds a few metadata fields to images when
we render an image. Those metadata can now be viewed in the
image editor.

Also, made sure metadata are available when we write imbufs
to disc with "Save As". There may be more cases here that need
fixing, but this means that loading an image with metadata
will now properly preserve them in blender.

1 files changed, 197 insertions, 0 deletions

diff --git a/source/blender/editors/screen/area.c b/source/blender/editors/screen/area.c
index d786c0cfc36..1c87d959dc4 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -61,6 +61,9 @@
 #include "BIF_glutil.h"
 #include "BLF_api.h"
 
+#include "IMB_imbuf.h"
+#include "IMB_imbuf_types.h"
+
 #include "UI_interface.h"
 #include "UI_interface_icons.h"
 #include "UI_resources.h"
@@ -2027,6 +2030,200 @@ void ED_region_info_draw(ARegion *ar, const char *text, int block, float fill_co
 	glScissor(scissor[0], scissor[1], scissor[2], scissor[3]);
 }
 
+#define MAX_METADATA_STR    1024
+
+const char *meta_data_list[] =
+{
+	"File",
+	"Strip",
+	"Note",
+	"Date",
+	"RenderTime",
+	"Marker",
+	"Time",
+	"Frame",
+	"Camera",
+	"Scene"
+};
+
+BLI_INLINE bool metadata_is_valid(ImBuf *ibuf, char *r_str, short index)
+{
+	return (IMB_metadata_get_field(ibuf, meta_data_list[index], r_str, MAX_METADATA_STR) && r_str[0]);
+}
+
+static void metadata_draw_lines(ImBuf *ibuf, rcti rect, int fontid, const bool is_top)
+{
+	char temp_str[MAX_METADATA_STR];
+	int line_width, line_height;
+	int ofs_y = 0;
+	short line_index;
+	short i;
+
+	for (line_index = 0; line_index < 4 && is_top == true; line_index++) {
+		/* first line */
+		if (line_index == 0) {
+			int len;
+			bool do_newline = false;
+			float height = 0.0;
+			BLI_snprintf(temp_str, MAX_METADATA_STR, "%s: ", meta_data_list[0]);
+			len = strlen(temp_str);
+			if (metadata_is_valid(ibuf, temp_str + len, 0)) {
+				BLF_position(fontid, rect.xmin + (0.2f * U.widget_unit),
+				             rect.ymax - (1.5f * U.widget_unit - UI_UNIT_Y), 0.0f);
+				BLF_draw(fontid, temp_str, BLF_DRAW_STR_DUMMY_MAX);
+				do_newline = true;
+				height = BLF_height(fontid, temp_str, strlen(temp_str));
+			}
+
+			BLI_snprintf(temp_str, MAX_METADATA_STR, "%s: ", meta_data_list[0]);
+			len = strlen(temp_str);
+			if (metadata_is_valid(ibuf, temp_str + len, 1)) {
+				len = strlen(temp_str);
+				line_width = BLF_width(fontid, temp_str, len);
+				BLF_position(fontid, rect.xmax - line_width - (0.2f * U.widget_unit),
+				             rect.ymax - (1.5f * U.widget_unit - UI_UNIT_Y), 0.0f);
+				BLF_draw(fontid, temp_str, BLF_DRAW_STR_DUMMY_MAX);
+				do_newline = true;
+				height = max_ff(BLF_height(fontid, temp_str, len), height);
+			}
+
+			if (do_newline)
+				ofs_y += (height + (0.2f * U.widget_unit));
+		}
+		else if (line_index == 1) {
+			if (metadata_is_valid(ibuf, temp_str, line_index + 1)) {
+				BLF_position(fontid, rect.xmin + (0.2f * U.widget_unit),
+				             rect.ymax - (1.5f * U.widget_unit - UI_UNIT_Y) - ofs_y, 0.0f);
+				BLF_draw(fontid, temp_str, BLF_DRAW_STR_DUMMY_MAX);
+				ofs_y += (BLF_height(fontid, temp_str, strlen(temp_str)) + (0.2f * U.widget_unit));
+			}
+		}
+		else {
+			if (metadata_is_valid(ibuf, temp_str, line_index + 1)) {
+				BLF_position(fontid, rect.xmax + (0.2f * U.widget_unit),
+				             rect.ymax - (1.5f * U.widget_unit - UI_UNIT_Y) - ofs_y, 0.0f);
+				BLF_draw(fontid, temp_str, BLF_DRAW_STR_DUMMY_MAX);
+				ofs_y += (BLF_height(fontid, temp_str, strlen(temp_str)) + (0.2f * U.widget_unit));
+			}
+		}
+	}
+
+	if (is_top == false) {
+		int ofs_x = 0;
+		for (i = 5; i < 10; i++) {
+			if (metadata_is_valid(ibuf, temp_str, i)) {
+				line_height = BLF_height(fontid, temp_str, strlen(temp_str));
+				BLF_position(fontid, rect.xmin + (0.2f * U.widget_unit) + ofs_x,
+				             rect.ymin - line_height + (1.5f * U.widget_unit), 0.0f);
+				BLF_draw(fontid, temp_str, BLF_DRAW_STR_DUMMY_MAX);
+	
+				ofs_x += BLF_width(fontid, temp_str, strlen(temp_str)) + UI_UNIT_X;
+			}
+		}
+	}
+}
+
+static float metadata_box_height_get(ImBuf *ibuf, int fontid, const bool is_top)
+{
+	char str[MAX_METADATA_STR];
+	float height = 0;
+	short i;
+
+	if (is_top) {
+		for (i = 0; i < 5 ; i++) {
+			if (metadata_is_valid(ibuf, str, i)) {
+				height += BLF_height(fontid, str, strlen(str));
+			}
+		}
+	}
+	else {
+		for (i = 5; i < 10; i++) {
+			if (metadata_is_valid(ibuf, str, i)) {
+				height += BLF_height(fontid, str, strlen(str));
+			}
+		}
+	}
+
+	if (height) {
+		return (height + (0.2f * U.widget_unit));
+	}
+
+	return 0;
+}
+
+#undef MAX_METADATA_STR
+
+void ED_region_image_metadata_draw(ARegion *ar, ImBuf *ibuf, float zoomx, float zoomy)
+{
+	uiStyle *style = UI_style_get_dpi();
+	int fontid = style->widget.uifont_id;
+	float box_y;
+	rcti rect;
+	int x, y;
+
+	if (!ibuf->metadata)
+		return;
+
+	/* find window pixel coordinates of origin */
+	UI_view2d_view_to_region(&ar->v2d, 0.0f, 0.0f, &x, &y);
+
+	glPushMatrix();
+
+	/* offset and zoom using ogl */
+	glTranslatef(x, y, 0.0f);
+	glScalef(zoomx, zoomy, 1.0f);
+
+	/* *** upper box*** */
+
+	/* get needed box height */
+	box_y = metadata_box_height_get(ibuf, fontid, true);
+
+	if (box_y) {
+		glColor3f(0.1f, 0.1f, 0.1f);
+		//glColor3f(1.0f, 0.15f, 0.8f); /* Pinkyfied version for Pablo */
+
+		/* set up rect */
+		BLI_rcti_init(&rect, 0, ibuf->x, ibuf->y, ibuf->y + box_y);
+		/* draw top box */
+		glRecti(rect.xmin, rect.ymin, rect.xmax, rect.ymax);
+
+		BLF_clipping(fontid, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
+		BLF_enable(fontid, BLF_CLIPPING);
+
+		glColor3f(1.0f, 1.0f, 1.0f);
+
+		metadata_draw_lines(ibuf, rect, fontid, true);
+
+		BLF_disable(fontid, BLF_CLIPPING);
+	}
+
+
+	/* *** lower box*** */
+
+	box_y = metadata_box_height_get(ibuf, fontid, false);
+
+	if (box_y) {
+		glColor3f(0.1f, 0.1f, 0.1f);
+		//glColor3f(1.0f, 0.15f, 0.8f); /* Pinkyfied version for Pablo */
+
+		/* set up box rect */
+		BLI_rcti_init(&rect, 0, ibuf->x, -box_y, 0);
+		/* draw top box */
+		glRecti(rect.xmin, rect.ymin, rect.xmax, rect.ymax);
+
+		BLF_clipping(fontid, rect.xmin, rect.ymin, rect.xmax, rect.ymax);
+		BLF_enable(fontid, BLF_CLIPPING);
+
+		glColor3f(1.0f, 1.0f, 1.0f);
+
+		metadata_draw_lines(ibuf, rect, fontid, false);
+
+		BLF_disable(fontid, BLF_CLIPPING);
+	}
+
+	glPopMatrix();
+}
+
 void ED_region_grid_draw(ARegion *ar, float zoomx, float zoomy)
 {
 	float gridsize, gridstep = 1.0f / 32.0f;