Rewrote test program for shaped windows. It definitely displays recognizable...

Rewrote test program for shaped windows.  It definitely displays recognizable pictures now, but the resizing and shaping functionality isn't behaving correctly, possibly due to a miscalculation of alpha values.

src/video/SDL_shape.c

@@ -63,14 +63,17 @@ void SDL_CalculateShapeBitmap(Uint8 alphacutoff,SDL_Surface *shape,Uint8* bitmap
 	Uint32 bitmap_pixel;
 	if(SDL_MUSTLOCK(shape))
 		SDL_LockSurface(shape);
-	for(x = 0;x<shape->w;x++)
-		for(y = 0;y<shape->h;y++) {
-			pixel = (Uint8 *)(shape->pixels) + (y*shape->pitch) + (x*shape->format->BytesPerPixel);
+	pixel = (Uint8*)shape->pixels;
+	for(y = 0;y<shape->h;y++) {
+		pixel = (Uint8 *)(shape->pixels) + y * shape->pitch;
+		for(x=0;x<shape->w;x++) {
 			alpha = 0;
 			SDL_GetRGBA(*(Uint32*)pixel,shape->format,&r,&g,&b,&alpha);
 			bitmap_pixel = y*shape->w + x;
 			bitmap[bitmap_pixel / ppb] |= (alpha >= alphacutoff ? value : 0) << ((ppb - 1) - (bitmap_pixel % ppb));
+			pixel += shape->format->BytesPerPixel;
 		}
+	}
 	if(SDL_MUSTLOCK(shape))
 		SDL_UnlockSurface(shape);
 }

test/Makefile.in

@@ -7,7 +7,7 @@ EXE	= @EXE@
 CFLAGS  = @CFLAGS@
 LIBS	= @LIBS@
 
-TARGETS = checkkeys$(EXE) graywin$(EXE) loopwave$(EXE) testalpha$(EXE) testatomic$(EXE) testaudioinfo$(EXE) testbitmap$(EXE) testblitspeed$(EXE) testcursor$(EXE) testdraw2$(EXE) testdyngles$(EXE) testdyngl$(EXE) testerror$(EXE) testeyes$(EXE) testfile$(EXE) testfill$(EXE) testgamma$(EXE) testgl2$(EXE) testgles$(EXE) testgl$(EXE) testhaptic$(EXE) testhread$(EXE) testiconv$(EXE) testime$(EXE) testintersections$(EXE) testjoystick$(EXE) testkeys$(EXE) testloadso$(EXE) testlock$(EXE) testmmousetablet$(EXE) testmultiaudio$(EXE) testoverlay2$(EXE) testoverlay$(EXE) testpalette$(EXE) testplatform$(EXE) testpower$(EXE) testresample$(EXE) testsem$(EXE) testsprite2$(EXE) testsprite$(EXE) testspriteminimal$(EXE) testtimer$(EXE) testver$(EXE) testvidinfo$(EXE) testwin$(EXE) testwm2$(EXE) testwm$(EXE) threadwin$(EXE) torturethread$(EXE)
+TARGETS = checkkeys$(EXE) graywin$(EXE) loopwave$(EXE) testalpha$(EXE) testatomic$(EXE) testaudioinfo$(EXE) testbitmap$(EXE) testblitspeed$(EXE) testcursor$(EXE) testdraw2$(EXE) testdyngles$(EXE) testdyngl$(EXE) testerror$(EXE) testfile$(EXE) testfill$(EXE) testgamma$(EXE) testgl2$(EXE) testgles$(EXE) testgl$(EXE) testhaptic$(EXE) testhread$(EXE) testiconv$(EXE) testime$(EXE) testintersections$(EXE) testjoystick$(EXE) testkeys$(EXE) testloadso$(EXE) testlock$(EXE) testmmousetablet$(EXE) testmultiaudio$(EXE) testoverlay2$(EXE) testoverlay$(EXE) testpalette$(EXE) testplatform$(EXE) testpower$(EXE) testresample$(EXE) testsem$(EXE) testshape$(EXE) testsprite2$(EXE) testsprite$(EXE) testspriteminimal$(EXE) testtimer$(EXE) testver$(EXE) testvidinfo$(EXE) testwin$(EXE) testwm2$(EXE) testwm$(EXE) threadwin$(EXE) torturethread$(EXE)
 
 all: Makefile $(TARGETS)
 
@@ -62,9 +62,6 @@ testdyngles$(EXE): $(srcdir)/testdyngles.c
 testerror$(EXE): $(srcdir)/testerror.c
 	$(CC) -o $@ $? $(CFLAGS) $(LIBS)
 
-testeyes$(EXE): $(srcdir)/testeyes.c
-	$(CC) -o $@ $? -std=c99 $(CFLAGS) $(LIBS)
-
 testfile$(EXE): $(srcdir)/testfile.c
 	$(CC) -o $@ $? $(CFLAGS) $(LIBS)
 
@@ -113,6 +110,9 @@ testplatform$(EXE): $(srcdir)/testplatform.c
 testsem$(EXE): $(srcdir)/testsem.c
 	$(CC) -o $@ $? $(CFLAGS) $(LIBS)
 
+testshape$(EXE): $(srcdir)/testshape.c
+	$(CC) -o $@ $? -std=c99 $(CFLAGS) $(LIBS)
+
 testspriteminimal$(EXE): $(srcdir)/testspriteminimal.c
 	$(CC) -o $@ $? $(CFLAGS) $(LIBS) @MATHLIB@
 

test/README

@@ -12,7 +12,6 @@ These are test programs for the SDL library:
 	testcursor	Tests custom mouse cursor
 	testdyngl	Tests dynamically loading OpenGL library
 	testerror	Tests multi-threaded error handling
-	testeyes	Tests shaped windows
 	testfile	Tests RWops layer
 	testgamma	Tests video device gamma ramp
 	testgl		A very simple example of using OpenGL with SDL
@@ -29,6 +28,7 @@ These are test programs for the SDL library:
 	testpalette	Tests palette color cycling
 	testplatform	Tests types, endianness and cpu capabilities
 	testsem		Tests SDL's semaphore implementation
+	testshape	Tests shaped windows
 	testsprite	Example of fast sprite movement on the screen
 	testsprite2	Improved version of testsprite
 	testtimer	Test the timer facilities

test/testeyes.c

-#include <stdlib.h>
-#include <math.h>
-#include <SDL_events.h>
-#include <SDL_rect.h>
-#include <SDL_pixels.h>
-#include <SDL_video.h>
-#include <SDL_shape.h>
-#include "testeyes_bitmap.h"
-#include "testeyes_mask_bitmap.h"
-
-/* The following code for the calculation of pupil positions has been taken and rewritten from the original xeyes.  The
-   copyright notice is included as follows, and the code is now under the same license as the rest of this file. */
-/*
-
-Copyright (c) 1991  X Consortium
-
-Permission is hereby granted, free of charge, to any person obtaining
-a copy of this software and associated documentation files (the
-"Software"), to deal in the Software without restriction, including
-without limitation the rights to use, copy, modify, merge, publish,
-distribute, sublicense, and/or sell copies of the Software, and to
-permit persons to whom the Software is furnished to do so, subject to
-the following conditions:
-
-The above copyright notice and this permission notice shall be included
-in all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
-OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
-MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
-IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
-OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
-ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
-OTHER DEALINGS IN THE SOFTWARE.
-
-Except as contained in this notice, the name of the X Consortium shall
-not be used in advertising or otherwise to promote the sale, use or
-other dealings in this Software without prior written authorization
-from the X Consortium.
-
-*/
-# define NUM_EYES	2
-# define EYE_X(n)	((n) * 2.0)
-# define EYE_Y(n)	(0.0)
-# define EYE_THICK	(0.175)	/* thickness of eye rim */
-# define EYE_OFFSET	(0.1)	/* padding between eyes */
-# define EYE_WIDTH	(2.0 - (EYE_THICK + EYE_OFFSET) * 2)
-# define EYE_HEIGHT	EYE_WIDTH
-# define EYE_HWIDTH	(EYE_WIDTH / 2.0)
-# define EYE_HHEIGHT	(EYE_HEIGHT / 2.0)
-# define BALL_WIDTH	(0.3)
-# define BALL_HEIGHT	BALL_WIDTH
-# define BALL_PAD	(0.05)
-# define BALL_DIST	((EYE_WIDTH - BALL_WIDTH) / 2.0 - BALL_PAD)
-
-SDL_Point computePupil (int num,SDL_Point mouse) {
-	double dx = mouse.x - EYE_X(num);
-	double dy = mouse.y - EYE_Y(num);
-	double cx = 0.0,cy = 0.0;
-	if(dx == 0 && dy == 0) {
-		cx = EYE_X(num);
-		cy = EYE_Y(num);
-	}
-	else {
-		double angle = atan2((double)dy,(double)dx);
-		double cosa = cos(angle);
-		double sina = sin(angle);
-		double hypotenuse = hypot(EYE_HHEIGHT * cosa, EYE_HWIDTH * sina);
-		double dist = BALL_DIST * hypot((EYE_HWIDTH * EYE_HHEIGHT) * cosa / hypotenuse,
-					        (EYE_HWIDTH * EYE_HHEIGHT) * sina / hypotenuse);
-		if(dist > hypot((double)dx,(double)dy)) {
-			cx = dx + EYE_X(num);
-			cy = dy + EYE_Y(num);
-		}
-		else {
-			cx = dist * cosa + EYE_X(num);
-			cy = dist * sina + EYE_Y(num);
-		}
-	}
-	SDL_Point ret = {cx,cy};
-	return ret;
-}
-
-/* Here begins the code exclusively and entirely written by Eli Gottlieb in May 2010. */
-typedef struct {
-	SDL_Rect left;
-	SDL_Rect right;
-} Pupil_Pair;
-typedef struct {
-	SDL_Point left;
-	SDL_Point right;
-} Pupil_Points;
-
-Pupil_Pair compute_pupil_positions(SDL_Point target) {
-	Pupil_Pair result;
-	Pupil_Points points;
-	points.left = computePupil(0,target);
-	points.right = computePupil(1,target);
-	result.left.x = points.left.x - BALL_WIDTH / 2.0;
-	result.left.y = points.left.y - BALL_HEIGHT / 2.0;
-	result.right.x = points.right.x - BALL_WIDTH / 2.0;
-	result.right.y = points.right.y - BALL_HEIGHT / 2.0;
-	result.left.w = result.right.w = BALL_WIDTH;
-	result.left.h = result.left.w = BALL_HEIGHT;
-	return result;
-}
-
-void render_eyes(SDL_Window *window,SDL_Texture *eyes_texture,Pupil_Pair pupils) {
-	SDL_SelectRenderer(window);
-	
-	//Clear render-target to blue.
-	SDL_SetRenderDrawColor(0x00,0x00,0xff,0xff);
-	SDL_RenderClear();
-	
-	//Render the whites of the eyes.
-	SDL_Rect srcdestrect = {0,0,eyes_width,eyes_height};
-	SDL_RenderCopy(eyes_texture,&srcdestrect,&srcdestrect);
-	
-	//Render the pupils.
-	SDL_SetRenderDrawColor(0x00,0x00,0x00,0xff);
-	const SDL_Rect eyes[2] = {pupils.left,pupils.right};
-	SDL_RenderFillRects((const SDL_Rect**)&eyes,2);
-	
-	SDL_RenderPresent();
-}
-
-int main(int argc,char** argv) {
-	if(SDL_VideoInit(NULL,0) == -1) {
-		printf("Could not initialize SDL video.\n");
-		exit(-1);
-	}
-	
-	SDL_Window *window = SDL_CreateShapedWindow("Big Brother is watching you.",eyes_x_hot,eyes_y_hot,eyes_width,eyes_height,SDL_WINDOW_RESIZABLE | SDL_WINDOW_SHOWN);
-	if(window == NULL) {
-		SDL_VideoQuit();
-		printf("Could not create shaped window for eyes.\n");
-		exit(-2);
-	}
-	if(SDL_CreateRenderer(window,-1,SDL_RENDERER_PRESENTFLIP2) == -1) {
-		SDL_DestroyWindow(window);
-		SDL_VideoQuit();
-		printf("Could not create rendering context for SDL_Eyes window.\n");
-		exit(-3);
-	}
-	
-	int bpp = 0;
-	Uint32 r = 0,g = 0,b = 0,a = 0;
-	SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_ARGB4444,&bpp,&r,&g,&b,&a);
-	SDL_Surface *eyes = SDL_CreateRGBSurface(0,eyes_width,eyes_height,bpp,r,g,b,a);
-	if(eyes == NULL) {
-		SDL_DestroyRenderer(window);
-		SDL_DestroyWindow(window);
-		SDL_VideoQuit();
-		printf("Could not create eyes surface.\n");
-		exit(-4);
-	}
-	
-	void *pixels = NULL;
-	int pitch = 0;
-	SDL_Rect rect = {0,0,eyes_width,eyes_height};
-	if(SDL_MUSTLOCK(eyes))
-		SDL_LockSurface(eyes);
-	pixels = eyes->pixels;
-	pitch = eyes->pitch;
-	for(int y=0;y<eyes_height;y++)
-		for(int x=0;x<eyes_width;x++) {
-			Uint8 brightness = *(Uint8*)(eyes_bits+(eyes_width/8)*y+(x/8)) & (1 << (7 - x % 8)) ? 255 : 0;
-			*(Uint16*)(pixels+pitch*y+x*16/8) = SDL_MapRGBA(eyes->format,brightness,brightness,brightness,255);
-		}
-	if(SDL_MUSTLOCK(eyes))
-		SDL_UnlockSurface(eyes);
-	SDL_Texture *eyes_texture = SDL_CreateTextureFromSurface(0,eyes);
-	if(eyes_texture == NULL) {
-		SDL_FreeSurface(eyes);
-		SDL_DestroyRenderer(window);
-		SDL_DestroyWindow(window);
-		SDL_VideoQuit();
-		printf("Could not create eyes texture.\n");
-		exit(-5);
-	}
-
-	SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_ARGB4444,&bpp,&r,&g,&b,&a);
-	SDL_Surface *mask = SDL_CreateRGBSurface(0,eyesmask_width,eyesmask_height,bpp,r,g,b,a);
-	if(mask == NULL) {
-		SDL_DestroyTexture(eyes_texture);
-		SDL_FreeSurface(eyes);
-		SDL_DestroyRenderer(window);
-		SDL_DestroyWindow(window);
-		SDL_VideoQuit();
-		printf("Could not create shape mask texture.\n");
-		exit(-5);
-	}
-	
-	if(SDL_MUSTLOCK(mask))
-		SDL_LockSurface(mask);
-	pixels = mask->pixels;
-	pitch = mask->pitch;
-	for(int y=0;y<eyesmask_height;y++)
-		for(int x=0;x<eyesmask_width;x++) {
-			Uint8 alpha = *(Uint8*)(eyesmask_bits+(eyesmask_width/8)*y+(x/8)) & (1 << (7 - x % 8)) ? 1 : 0;
-			*(Uint16*)(pixels+pitch*y+x*bpp/8) = SDL_MapRGBA(mask->format,0,0,0,alpha);
-		}
-	if(SDL_MUSTLOCK(mask))
-		SDL_UnlockSurface(mask);
-	
-	SDL_WindowShapeMode mode = {ShapeModeDefault,1};
-	SDL_SetWindowShape(window,mask,&mode);
-	
-	SDL_Event event;
-	int event_pending = 0;
-	event_pending = SDL_PollEvent(&event);
-	SDL_Point mouse_position;
-	Pupil_Pair pupil_positions;
-	SDL_SelectMouse(0);
-	SDL_GetMouseState(&mouse_position.x,&mouse_position.y);
-	pupil_positions = compute_pupil_positions(mouse_position);
-	while(event.type != SDL_QUIT) {
-		if(event.type == SDL_MOUSEMOTION) {
-			mouse_position.x = event.motion.x;
-			mouse_position.y = event.motion.y;
-			pupil_positions = compute_pupil_positions(mouse_position);
-		}
-		render_eyes(window,eyes_texture,pupil_positions);
-		event_pending = SDL_PollEvent(&event);
-	}
-	
-	SDL_FreeSurface(mask);
-	SDL_DestroyTexture(eyes_texture);
-	SDL_DestroyWindow(window);
-	//Call SDL_VideoQuit() before quitting.
-	SDL_VideoQuit();
-}

test/testeyes_bitmap.h

-#define eyes_width 48
-#define eyes_height 32
-#define eyes_x_hot 0
-#define eyes_y_hot 0
-static unsigned char eyes_bits[] = {
-   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-   0x00, 0x78, 0x00, 0x00, 0x1e, 0x00, 0x00, 0xfe, 0x01, 0x80, 0x7f, 0x00,
-   0x00, 0x87, 0x03, 0xc0, 0xe1, 0x00, 0x80, 0x01, 0x06, 0x60, 0x80, 0x01,
-   0xc0, 0x00, 0x0c, 0x30, 0x00, 0x03, 0x60, 0x00, 0x18, 0x18, 0x00, 0x06,
-   0x30, 0x00, 0x30, 0x0c, 0x00, 0x0c, 0x30, 0x00, 0x30, 0x0c, 0x00, 0x0c,
-   0x10, 0x00, 0x20, 0x04, 0x00, 0x08, 0x18, 0x00, 0x60, 0x06, 0x00, 0x18,
-   0x18, 0x00, 0x60, 0x06, 0x00, 0x18, 0x18, 0x00, 0x60, 0x06, 0x00, 0x18,
-   0x18, 0x00, 0x60, 0x06, 0x00, 0x18, 0x18, 0x00, 0x60, 0x06, 0x00, 0x18,
-   0x18, 0x00, 0x60, 0x06, 0x00, 0x18, 0x18, 0x80, 0x63, 0x06, 0x00, 0x18,
-   0x18, 0x80, 0x63, 0x06, 0xe0, 0x18, 0x18, 0x80, 0x63, 0x06, 0xe0, 0x18,
-   0x18, 0x00, 0x60, 0x06, 0xe0, 0x18, 0x18, 0x00, 0x20, 0x06, 0x00, 0x08,
-   0x10, 0x00, 0x30, 0x04, 0x00, 0x0c, 0x10, 0x00, 0x10, 0x04, 0x00, 0x04,
-   0x30, 0x00, 0x18, 0x0c, 0x00, 0x06, 0x60, 0x00, 0x08, 0x18, 0x00, 0x02,
-   0x40, 0x00, 0x0c, 0x10, 0x00, 0x03, 0xc0, 0x00, 0x06, 0x30, 0x80, 0x01,
-   0x80, 0x83, 0x03, 0xe0, 0xe0, 0x00, 0x00, 0xff, 0x01, 0xc0, 0x7f, 0x00,
-   0x00, 0xfe, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

test/testeyes_mask_bitmap.h

-#define eyesmask_width 48
-#define eyesmask_height 32
-#define eyesmask_x_hot 0
-#define eyesmask_y_hot 0
-static unsigned char eyesmask_bits[] = {
-   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
-   0x00, 0x78, 0x00, 0x00, 0x1e, 0x00, 0x00, 0xfe, 0x01, 0x80, 0x7f, 0x00,
-   0x00, 0xff, 0x03, 0xc0, 0xff, 0x00, 0x80, 0xff, 0x07, 0xe0, 0xff, 0x01,
-   0xc0, 0xff, 0x0f, 0xf0, 0xff, 0x03, 0xe0, 0xff, 0x1f, 0xf8, 0xff, 0x07,
-   0xf0, 0xff, 0x3f, 0xfc, 0xff, 0x0f, 0xf0, 0xff, 0x3f, 0xfc, 0xff, 0x0f,
-   0xf0, 0xff, 0x3f, 0xfc, 0xff, 0x0f, 0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f,
-   0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f, 0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f,
-   0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f, 0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f,
-   0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f, 0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f,
-   0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f, 0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f,
-   0xf8, 0xff, 0x7f, 0xfe, 0xff, 0x1f, 0xf8, 0xff, 0x3f, 0xfe, 0xff, 0x0f,
-   0xf0, 0xff, 0x3f, 0xfc, 0xff, 0x0f, 0xf0, 0xff, 0x1f, 0xfc, 0xff, 0x07,
-   0xf0, 0xff, 0x1f, 0xfc, 0xff, 0x07, 0xe0, 0xff, 0x0f, 0xf8, 0xff, 0x03,
-   0xc0, 0xff, 0x0f, 0xf0, 0xff, 0x03, 0xc0, 0xff, 0x07, 0xf0, 0xff, 0x01,
-   0x80, 0xff, 0x03, 0xe0, 0xff, 0x00, 0x00, 0xff, 0x01, 0xc0, 0x7f, 0x00,
-   0x00, 0xfe, 0x00, 0x00, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

test/testshape.c

+#include <stdlib.h>
+#include <math.h>
+#include <SDL_events.h>
+#include <SDL_rect.h>
+#include <SDL_pixels.h>
+#include <SDL_video.h>
+#include <SDL_shape.h>
+
+#define SHAPED_WINDOW_X 150
+#define SHAPED_WINDOW_Y 150
+#define SHAPED_WINDOW_DIMENSION 640
+
+int main(int argc,char** argv) {
+        if(argc < 2) {
+        	printf("SDL_Shape requires at least one bitmap file as argument.\n");
+        	exit(-1);
+        }
+	
+	if(SDL_VideoInit(NULL,0) == -1) {
+		printf("Could not initialize SDL video.\n");
+		exit(-2);
+	}
+	
+	Uint8 num_pictures = argc - 1;
+	SDL_Surface **pictures = malloc(sizeof(SDL_Surface*)*num_pictures);
+	int i = 0;
+	for(i=0;i<num_pictures;i++)
+		pictures[i] = NULL;
+	for(i=0;i<num_pictures;i++) {
+		SDL_Surface *original = SDL_LoadBMP(argv[i+1]);
+		if(original == NULL) {
+			int j = 0;
+			for(j=0;j<num_pictures;j++)
+				if(pictures[j] != NULL)
+					SDL_FreeSurface(pictures[j]);
+			free(pictures);
+			SDL_VideoQuit();
+			printf("Could not load surface from named bitmap file.\n");
+			exit(-3);
+		}
+		//THIS CONVERSION ROUTINE IS FRAGILE!  It relies in the fact that only certain portions of the format structure must be filled in to use it.
+		SDL_PixelFormat format = {NULL,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+		SDL_PixelFormatEnumToMasks(SDL_PIXELFORMAT_RGBA8888,&format.BitsPerPixel,&format.Rmask,&format.Gmask,&format.Bmask,&format.Amask);
+		format.BytesPerPixel = format.BitsPerPixel / 8 + (format.BitsPerPixel % 8 > 0 ? 1 : 0);
+		pictures[i] = SDL_ConvertSurface(original,&format,0);
+		//We have no more need of the original now that we have our desired format.
+		SDL_FreeSurface(original);
+		if(pictures[i] == NULL) {
+			int j = 0;
+			for(j=0;j<num_pictures;j++)
+				if(pictures[j] != NULL)
+					SDL_FreeSurface(pictures[j]);
+			free(pictures);
+			SDL_VideoQuit();
+			printf("Could not convert bitmap surface to desired format.\n");
+			exit(-3);
+		}
+		
+		if(SDL_MUSTLOCK(pictures[i]))
+			SDL_LockSurface(pictures[i]);
+			
+		void* pixels = pictures[i]->pixels;
+		unsigned int pitch = pictures[i]->pitch;
+		int y =0,x = 0;
+		for(y=0;y<pictures[i]->h;y++)
+			for(x=0;x<pictures[i]->w;x++) {
+				Uint32* pixel = pixels+y*pitch+x*pictures[i]->format->BytesPerPixel;
+				Uint8 r = 0,g = 0,b = 0;
+				SDL_GetRGB(*pixel,pictures[i]->format,&r,&g,&b);
+				if(r == g == b == 0x00)
+					*pixel = SDL_MapRGBA(pictures[i]->format,r,g,b,0);
+			}
+			
+		if(SDL_MUSTLOCK(pictures[i]))
+			SDL_UnlockSurface(pictures[i]);
+	}
+	
+	SDL_Window *window = SDL_CreateShapedWindow("SDL_Shape test",SHAPED_WINDOW_X,SHAPED_WINDOW_Y,SHAPED_WINDOW_DIMENSION,SHAPED_WINDOW_DIMENSION,SDL_WINDOW_RESIZABLE | SDL_WINDOW_SHOWN);
+	if(window == NULL) {
+		for(i=0;i<num_pictures;i++)
+			SDL_FreeSurface(pictures[i]);
+		free(pictures);
+		SDL_VideoQuit();
+		printf("Could not create shaped window for SDL_Shape.\n");
+		exit(-4);
+	}
+	if(SDL_CreateRenderer(window,-1,SDL_RENDERER_PRESENTFLIP2) == -1) {
+		SDL_DestroyWindow(window);
+		for(i=0;i<num_pictures;i++)
+			SDL_FreeSurface(pictures[i]);
+		free(pictures);
+		SDL_VideoQuit();
+		printf("Could not create rendering context for SDL_Shape window.\n");
+		exit(-5);
+	}
+	
+	SDL_Texture **textures = malloc(sizeof(SDL_Texture*)*num_pictures);
+	for(i=0;i<num_pictures;i++)
+		textures[i] = NULL;
+	for(i=0;i<num_pictures;i++) {
+		textures[i] = SDL_CreateTextureFromSurface(0,pictures[i]);
+		if(textures[i] == NULL) {
+			int j = 0;
+			for(j=0;j<num_pictures;i++)
+				if(textures[i] != NULL)
+					SDL_DestroyTexture(textures[i]);
+			free(textures);
+			for(i=0;i<num_pictures;i++)
+				SDL_FreeSurface(pictures[i]);
+			free(pictures);
+			SDL_DestroyRenderer(window);
+			SDL_DestroyWindow(window);
+			SDL_VideoQuit();
+			printf("Could not create texture for SDL_shape.\n");
+			exit(-6);
+		}
+	}
+	
+	SDL_Event event;
+	int event_pending = 0;
+	event_pending = SDL_PollEvent(&event);
+	unsigned int current_picture = 0;
+	SDL_WindowShapeMode mode = {ShapeModeDefault,1};
+	SDL_SetWindowShape(window,pictures[current_picture],&mode);
+	int mouse_down = 0;
+	Uint32 format,access;
+	SDL_Rect texture_dimensions = {0,0,0,0};
+	SDL_QueryTexture(textures[current_picture],&format,&access,&texture_dimensions.w,&texture_dimensions.h);
+	SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
+	while(event.type != SDL_QUIT) {
+		if(event.type == SDL_MOUSEBUTTONDOWN)
+			mouse_down = 1;
+		if(mouse_down && event.type == SDL_MOUSEBUTTONUP) {
+			mouse_down = 0;
+			current_picture += 1;
+			if(current_picture >= num_pictures)
+				current_picture = 0;
+			SDL_QueryTexture(textures[current_picture],&format,&access,&texture_dimensions.w,&texture_dimensions.h);
+			SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
+			SDL_SetWindowShape(window,pictures[current_picture],&mode);
+		}
+		
+		SDL_SelectRenderer(window);
+	
+		//Clear render-target to blue.
+		SDL_SetRenderDrawColor(0x00,0x00,0xff,0xff);
+		SDL_RenderClear();
+		
+		//Render the texture.
+		SDL_RenderCopy(textures[current_picture],&texture_dimensions,&texture_dimensions);
+		
+		SDL_RenderPresent();
+		event_pending = SDL_PollEvent(&event);
+	}
+	
+	//Free the textures.
+	for(i=0;i<num_pictures;i++)
+		SDL_DestroyTexture(textures[i]);
+	free(textures);
+	//Destroy the window.
+	SDL_DestroyWindow(window);
+	//Free the original surfaces backing the textures.
+	for(i=0;i<num_pictures;i++)
+		SDL_FreeSurface(pictures[i]);
+	free(pictures);
+	//Call SDL_VideoQuit() before quitting.
+	SDL_VideoQuit();
+}