Correcting minor bugs and adding assertions to help me track down a NULL pointer bug in Cocoa code.

src/video/SDL_shape.c

@@ -22,6 +22,7 @@
 #include "SDL_config.h"
 
 #include "SDL.h"
+#include "SDL_assert.h"
 #include "SDL_video.h"
 #include "SDL_sysvideo.h"
 #include "SDL_pixels.h"
@@ -197,6 +198,7 @@ SDL_ShapeTree* SDL_CalculateShapeTree(SDL_WindowShapeMode mode,SDL_Surface* shap
 }
 
 void SDL_TraverseShapeTree(SDL_ShapeTree *tree,SDL_TraversalFunction function,void* closure) {
+	SDL_assert(tree != NULL);
 	if(tree->kind == QuadShape) {
 		SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upleft,function,closure);
 		SDL_TraverseShapeTree((SDL_ShapeTree *)tree->data.children.upright,function,closure);

src/video/cocoa/SDL_cocoashape.m

@@ -28,7 +28,7 @@
 
 SDL_WindowShaper* Cocoa_CreateShaper(SDL_Window* window) {
 	SDL_WindowData* data = (SDL_WindowData*)window->driverdata;
-	[data->nswindow setAlpha:1.0];
+	[data->nswindow setAlphaValue:1.0];
 	[data->nswindow setOpaque:YES];
 	[data->nswindow setStyleMask:NSBorderlessWindowMask];
 	SDL_WindowShaper* result = SDL_malloc(sizeof(SDL_WindowShaper));
@@ -45,7 +45,7 @@ SDL_WindowShaper* Cocoa_CreateShaper(SDL_Window* window) {
 	shape_data->shape = NULL;
 	
 	int resized_properly = Cocoa_ResizeWindowShape(window);
-	assert(resized_properly == 0);
+	SDL_assert(resized_properly == 0);
 	return result;
 }
 
@@ -60,6 +60,7 @@ NSRect convert_rect(SDL_Rect rect,SDL_Window* window) {
 }
 
 void ConglomerateShapeTree(SDL_ShapeTree* tree,SDL_PathConglomeration* cong) {
+	SDL_assert(tree != NULL);
 	if(tree->kind == OpaqueShape) {
 		NSRect rect = convert_rect(tree->data.shape,cong->window);
 		[cong->clipPath appendBezierPathWithRect:rect];
@@ -91,7 +92,7 @@ int Cocoa_SetWindowShape(SDL_WindowShaper *shaper,SDL_Surface *shape,SDL_WindowS
 
 int Cocoa_ResizeWindowShape(SDL_Window *window) {
 	SDL_ShapeData* data = window->shaper->driverdata;
-	assert(data != NULL);
+	SDL_assert(data != NULL);
 	
 	if(data->shape != NULL)
 		SDL_FreeShapeTree(&data->shape);

src/video/x11/SDL_x11shape.c

@@ -20,7 +20,8 @@
     eligottlieb@gmail.com
 */
 
-#include <assert.h>
+#include "SDL_assert.h"
+#include "SDL_malloc.h"
 #include "SDL_x11video.h"
 #include "SDL_x11shape.h"
 #include "SDL_x11window.h"
@@ -39,13 +40,13 @@ SDL_WindowShaper* X11_CreateShaper(SDL_Window* window) {
 		result->mode.mode = ShapeModeDefault;
 		result->mode.parameters.binarizationCutoff = 1;
 		result->usershownflag = 0;
-		SDL_ShapeData* data = malloc(sizeof(SDL_ShapeData));
+		SDL_ShapeData* data = SDL_malloc(sizeof(SDL_ShapeData));
 		result->driverdata = data;
 		data->bitmapsize = 0;
 		data->bitmap = NULL;
 		window->shaper = result;
 		int resized_properly = X11_ResizeWindowShape(window);
-		assert(resized_properly == 0);
+		SDL_assert(resized_properly == 0);
 	}
 #endif
 
@@ -54,7 +55,7 @@ SDL_WindowShaper* X11_CreateShaper(SDL_Window* window) {
 
 int X11_ResizeWindowShape(SDL_Window* window) {
 	SDL_ShapeData* data = window->shaper->driverdata;
-	assert(data != NULL);
+	SDL_assert(data != NULL);
 	
 	unsigned int bitmapsize = window->w / 8;
 	if(window->w % 8 > 0)