From 9994b3f49db7bd925a7ae7874cbc99025469ee9e Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Thu, 12 Jan 2012 01:12:28 +0100
Subject: Use the same coordinate system for pdf and xps pages in the
 interface.

Move coordinate space tweaks into pdf_ and xps_run_page, and provide
neutral pdf_ and xps_bound_page functions to return the page size as
a zero-origined bounding box.
---
 android/jni/mupdf.c | 12 +++---------
 apps/pdfapp.c       | 18 ++++--------------
 apps/pdfapp.h       |  1 -
 apps/pdfdraw.c      |  8 ++++----
 apps/xpsdraw.c      | 10 +++-------
 ios/document.c      | 25 ++++++++-----------------
 pdf/mupdf.h         |  1 +
 pdf/pdf_interpret.c |  8 +++++++-
 pdf/pdf_page.c      | 10 ++++++++++
 xps/muxps.h         |  1 +
 xps/xps_doc.c       | 10 ++++++++++
 xps/xps_tile.c      |  5 +++++
 12 files changed, 56 insertions(+), 53 deletions(-)

diff --git a/android/jni/mupdf.c b/android/jni/mupdf.c
index 277bb7b3..f0d13b73 100644
--- a/android/jni/mupdf.c
+++ b/android/jni/mupdf.c
@@ -29,7 +29,6 @@ float pageWidth = 100;
 float pageHeight = 100;
 fz_display_list *currentPageList;
 fz_rect currentMediabox;
-int currentRotate;
 fz_context *ctx;
 
 JNIEXPORT int JNICALL
@@ -124,11 +123,8 @@ Java_com_artifex_mupdf_MuPDFCore_gotoPageInternal(JNIEnv *env, jobject thiz, int
 		pagenum = page;
 		currentPage = pdf_load_page(xref, pagenum);
 		zoom = resolution / 72;
-		currentMediabox = currentPage->mediabox;
-		currentRotate = currentPage->rotate;
-		ctm = fz_translate(0, -currentMediabox.y1);
-		ctm = fz_concat(ctm, fz_scale(zoom, -zoom));
-		ctm = fz_concat(ctm, fz_rotate(currentRotate));
+		currentMediabox = pdf_bound_page(xref, currentPage);
+		ctm = fz_scale(zoom, zoom);
 		bbox = fz_round_rect(fz_transform_rect(ctm, currentMediabox));
 		pageWidth = bbox.x1-bbox.x0;
 		pageHeight = bbox.y1-bbox.y0;
@@ -216,9 +212,7 @@ Java_com_artifex_mupdf_MuPDFCore_drawPage(JNIEnv *env, jobject thiz, jobject bit
 		fz_clear_pixmap_with_color(pix, 0xff);
 
 		zoom = resolution / 72;
-		ctm = fz_translate(-currentMediabox.x0, -currentMediabox.y1);
-		ctm = fz_concat(ctm, fz_scale(zoom, -zoom));
-		ctm = fz_concat(ctm, fz_rotate(currentRotate));
+		ctm = fz_scale(zoom, zoom);
 		bbox = fz_round_rect(fz_transform_rect(ctm,currentMediabox));
 		/* Now, adjust ctm so that it would give the correct page width
 		 * heights. */
diff --git a/apps/pdfapp.c b/apps/pdfapp.c
index 0f8dd7e3..250ca198 100644
--- a/apps/pdfapp.c
+++ b/apps/pdfapp.c
@@ -260,13 +260,8 @@ void pdfapp_close(pdfapp_t *app)
 static fz_matrix pdfapp_viewctm(pdfapp_t *app)
 {
 	fz_matrix ctm;
-	ctm = fz_identity;
-	ctm = fz_concat(ctm, fz_translate(0, -app->page_bbox.y1));
-	if (app->xref)
-		ctm = fz_concat(ctm, fz_scale(app->resolution/72.0f, -app->resolution/72.0f));
-	else
-		ctm = fz_concat(ctm, fz_scale(app->resolution/96.0f, app->resolution/96.0f));
-	ctm = fz_concat(ctm, fz_rotate(app->rotate + app->page_rotate));
+	ctm = fz_scale(app->resolution/72.0f, app->resolution/72.0f);
+	ctm = fz_concat(ctm, fz_rotate(app->rotate));
 	return ctm;
 }
 
@@ -308,8 +303,7 @@ static void pdfapp_loadpage_pdf(pdfapp_t *app)
 		pdfapp_error(app, "cannot load page");
 	}
 
-	app->page_bbox = page->mediabox;
-	app->page_rotate = page->rotate;
+	app->page_bbox = pdf_bound_page(app->xref, page);
 	app->page_links = page->links;
 	page->links = NULL;
 
@@ -343,11 +337,7 @@ static void pdfapp_loadpage_xps(pdfapp_t *app)
 		pdfapp_error(app, "cannot load page");
 	}
 
-	app->page_bbox.x0 = 0;
-	app->page_bbox.y0 = 0;
-	app->page_bbox.x1 = page->width;
-	app->page_bbox.y1 = page->height;
-	app->page_rotate = 0;
+	app->page_bbox = xps_bound_page(app->xps, page);
 	app->page_links = NULL;
 
 	/* Create display list */
diff --git a/apps/pdfapp.h b/apps/pdfapp.h
index 84d00979..b23f939a 100644
--- a/apps/pdfapp.h
+++ b/apps/pdfapp.h
@@ -45,7 +45,6 @@ struct pdfapp_s
 	/* current page params */
 	int pageno;
 	fz_rect page_bbox;
-	float page_rotate;
 	fz_display_list *page_list;
 	fz_text_span *page_text;
 	fz_link *page_links;
diff --git a/apps/pdfdraw.c b/apps/pdfdraw.c
index 885103bc..d811df07 100644
--- a/apps/pdfdraw.c
+++ b/apps/pdfdraw.c
@@ -193,17 +193,17 @@ static void drawpage(pdf_xref *xref, int pagenum)
 	{
 		float zoom;
 		fz_matrix ctm;
+		fz_rect bounds;
 		fz_bbox bbox;
 		fz_pixmap *pix = NULL;
 
 		fz_var(pix);
 
+		bounds = pdf_bound_page(xref, page);
 		zoom = resolution / 72;
-		ctm = fz_translate(0, -page->mediabox.y1);
-		ctm = fz_concat(ctm, fz_scale(zoom, -zoom));
-		ctm = fz_concat(ctm, fz_rotate(page->rotate));
+		ctm = fz_scale(zoom, zoom);
 		ctm = fz_concat(ctm, fz_rotate(rotation));
-		bbox = fz_round_rect(fz_transform_rect(ctm, page->mediabox));
+		bbox = fz_round_rect(fz_transform_rect(ctm, bounds));
 
 		/* TODO: banded rendering and multi-page ppm */
 
diff --git a/apps/xpsdraw.c b/apps/xpsdraw.c
index 1058c390..50a2c3e3 100644
--- a/apps/xpsdraw.c
+++ b/apps/xpsdraw.c
@@ -137,13 +137,9 @@ static void drawpage(xps_document *doc, int pagenum)
 		fz_bbox bbox;
 		fz_pixmap *pix;
 
-		rect.x0 = rect.y0 = 0;
-		rect.x1 = page->width;
-		rect.y1 = page->height;
-
-		zoom = resolution / 96;
-		ctm = fz_translate(0, -page->height);
-		ctm = fz_concat(ctm, fz_scale(zoom, zoom));
+		rect = xps_bound_page(doc, page);
+		zoom = resolution / 72;
+		ctm = fz_scale(zoom, zoom);
 		bbox = fz_round_rect(fz_transform_rect(ctm, rect));
 
 		/* TODO: banded rendering and multi-page ppm */
diff --git a/ios/document.c b/ios/document.c
index dd893362..3d014d6b 100644
--- a/ios/document.c
+++ b/ios/document.c
@@ -120,15 +120,14 @@ measure_page(struct document *doc, int number, float *w, float *h)
 {
 	load_page(doc, number);
 	if (doc->pdf_page) {
-		pdf_page *page = doc->pdf_page;
-		fz_rect mediabox = fz_transform_rect(fz_rotate(page->rotate), page->mediabox);
-		*w = mediabox.x1 - mediabox.x0;
-		*h = mediabox.y1 - mediabox.y0;
+		fz_rect bounds = pdf_bound_page(doc->pdf, doc->pdf_page);
+		*w = bounds.x1 - bounds.x0;
+		*h = bounds.y1 - bounds.y0;
 	}
 	else if (doc->xps_page) {
-		xps_page *page = doc->xps_page;
-		*w = page->width * 72.0f / 96.0f;
-		*h = page->height * 72.0f / 96.0f;
+		fz_rect bounds = xps_bound_page(doc->xps, doc->xps_page);
+		*w = bounds.x1 - bounds.x0;
+		*h = bounds.y1 - bounds.y0;
 	}
 	else {
 		*w = *h = 72;
@@ -143,17 +142,9 @@ draw_page(struct document *doc, int number, fz_device *dev, fz_matrix ctm, fz_co
 	fz_try (doc->ctx)
 	{
 		if (doc->pdf_page) {
-			pdf_page *page = doc->pdf_page;
-			fz_matrix page_ctm = fz_concat(fz_rotate(-page->rotate), fz_scale(1, -1));
-			fz_rect mediabox = fz_transform_rect(page_ctm, page->mediabox);
-			page_ctm = fz_concat(page_ctm, fz_translate(-mediabox.x0, -mediabox.y0));
-			ctm = fz_concat(page_ctm, ctm);
-			pdf_run_page(doc->pdf, page, dev, ctm, cookie);
+			pdf_run_page(doc->pdf, doc->pdf_page, dev, ctm, cookie);
 		} else if (doc->xps_page) {
-			xps_page *page = doc->xps_page;
-			fz_matrix page_ctm = fz_scale(72.0f / 96.0f, 72.0f / 96.0f);
-			ctm = fz_concat(page_ctm, ctm);
-			xps_run_page(doc->xps, page, dev, ctm, cookie);
+			xps_run_page(doc->xps, doc->xps_page, dev, ctm, cookie);
 		}
 	}
 	fz_catch (doc->ctx)
diff --git a/pdf/mupdf.h b/pdf/mupdf.h
index d9a6b7c6..1ec9d4f2 100644
--- a/pdf/mupdf.h
+++ b/pdf/mupdf.h
@@ -455,6 +455,7 @@ int pdf_find_page_number(pdf_xref *xref, fz_obj *pageobj);
 int pdf_count_pages(pdf_xref *xref);
 
 pdf_page *pdf_load_page(pdf_xref *xref, int number);
+fz_rect pdf_bound_page(pdf_xref *xref, pdf_page *page);
 void pdf_free_page(fz_context *ctx, pdf_page *page);
 
 /*
diff --git a/pdf/pdf_interpret.c b/pdf/pdf_interpret.c
index c8b65dd6..fe0e1ce8 100644
--- a/pdf/pdf_interpret.c
+++ b/pdf/pdf_interpret.c
@@ -2574,10 +2574,16 @@ pdf_run_buffer(pdf_csi *csi, fz_obj *rdb, fz_buffer *contents)
 void
 pdf_run_page_with_usage(pdf_xref *xref, pdf_page *page, fz_device *dev, fz_matrix ctm, char *event, fz_cookie *cookie)
 {
+	fz_context *ctx = dev->ctx;
 	pdf_csi *csi;
 	pdf_annot *annot;
 	int flags;
-	fz_context *ctx = dev->ctx;
+
+	/* Adjust CTM for rotation */
+	fz_matrix page_ctm = fz_concat(fz_rotate(-page->rotate), fz_scale(1, -1));
+	fz_rect mediabox = fz_transform_rect(page_ctm, page->mediabox);
+	page_ctm = fz_concat(page_ctm, fz_translate(-mediabox.x0, -mediabox.y0));
+	ctm = fz_concat(page_ctm, ctm);
 
 	if (page->transparency)
 		fz_begin_group(dev, fz_transform_rect(ctm, page->mediabox), 1, 0, 0, 1);
diff --git a/pdf/pdf_page.c b/pdf/pdf_page.c
index e8b27ccc..536cd5ac 100644
--- a/pdf/pdf_page.c
+++ b/pdf/pdf_page.c
@@ -386,6 +386,16 @@ pdf_load_page(pdf_xref *xref, int number)
 	return page;
 }
 
+fz_rect
+pdf_bound_page(pdf_xref *xref, pdf_page *page)
+{
+	fz_rect bounds, mediabox = fz_transform_rect(fz_rotate(page->rotate), page->mediabox);
+	bounds.x0 = bounds.y0 = 0;
+	bounds.x1 = mediabox.x1 - mediabox.x0;
+	bounds.y1 = mediabox.y1 - mediabox.y0;
+	return bounds;
+}
+
 void
 pdf_free_page(fz_context *ctx, pdf_page *page)
 {
diff --git a/xps/muxps.h b/xps/muxps.h
index 95b68860..96a8a1eb 100644
--- a/xps/muxps.h
+++ b/xps/muxps.h
@@ -105,6 +105,7 @@ void xps_free_page_list(xps_document *doc);
 
 int xps_count_pages(xps_document *doc);
 xps_page *xps_load_page(xps_document *doc, int number);
+fz_rect xps_bound_page(xps_document *doc, xps_page *page);
 void xps_free_page(xps_document *doc, xps_page *page);
 
 fz_outline *xps_load_outline(xps_document *doc);
diff --git a/xps/xps_doc.c b/xps/xps_doc.c
index c01b7561..36903266 100644
--- a/xps/xps_doc.c
+++ b/xps/xps_doc.c
@@ -364,6 +364,16 @@ xps_load_page(xps_document *doc, int number)
 	return NULL;
 }
 
+fz_rect
+xps_bound_page(xps_document *doc, xps_page *page)
+{
+	fz_rect bounds;
+	bounds.x0 = bounds.y0 = 0;
+	bounds.x1 = page->width * 72.0f / 96.0f;
+	bounds.y1 = page->height * 72.0f / 96.0f;
+	return bounds;
+}
+
 void
 xps_free_page(xps_document *doc, xps_page *page)
 {
diff --git a/xps/xps_tile.c b/xps/xps_tile.c
index 842e4cda..b672724b 100644
--- a/xps/xps_tile.c
+++ b/xps/xps_tile.c
@@ -360,6 +360,11 @@ xps_parse_fixed_page(xps_document *doc, fz_matrix ctm, xps_page *page)
 void
 xps_run_page(xps_document *doc, xps_page *page, fz_device *dev, fz_matrix ctm, fz_cookie *cookie)
 {
+	fz_matrix page_ctm;
+
+	page_ctm = fz_scale(72.0f / 96.0f, 72.0f / 96.0f);
+	ctm = fz_concat(page_ctm, ctm);
+
 	doc->cookie = cookie;
 	doc->dev = dev;
 	xps_parse_fixed_page(doc, ctm, page);
-- 
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