Copiado el tutorial 5 de Jailgames Vintage en YouTube, pero algo sigue fallando

jUnit.cpp

@@ -0,0 +1,163 @@
+#include "jUnit.h"
+#include "gif.c"
+#include <stdio.h>
+
+struct jSurface_s
+{
+    Uint8 *data;
+    Uint16 w, h;
+};
+
+static SDL_Window *jWin = NULL;
+static SDL_Renderer *jRen = NULL;
+static SDL_Texture *jTex = NULL;
+static jSurface jScreen;
+static jSurface jDestSurf;
+static jSurface jSourceSurf = NULL;
+static Uint32 paleta[256];
+static int jWidth = 320;
+static int jHeight = 240;
+static int jZoom = 2;
+
+jSurface jNewSurface(int w, int h)
+{
+    jSurface surf = (jSurface)malloc(sizeof(jSurface_s));
+    surf->w = w;
+    surf->h = h;
+    surf->data = (Uint8 *)malloc(w * h);
+    return surf;
+}
+
+void jDeleteSurface(jSurface surf)
+{
+    if (surf == NULL)
+        return;
+    if (surf->data != NULL)
+        free(surf->data);
+    free(surf);
+}
+
+void jSetDest(jSurface surf)
+{
+    if (surf == NULL)
+        jDestSurf = jScreen;
+    else
+        jDestSurf = surf;
+}
+
+void jSetSource(jSurface surf)
+{
+    jSourceSurf = surf;
+}
+
+void jBlit(int dx, int dy, int sx, int sy, int w, int h)
+{
+    if (jSourceSurf == NULL)
+        return;
+    for (int iy = 0; iy < h; ++iy)
+    {
+        for (int ix = 0; ix < w; ++ix)
+            jPutPixel(dx + ix, dy + iy, jGetPixel(sx + ix, sy + iy));
+    }
+}
+
+jSurface jLoadSurface(const char *filename)
+{
+    FILE *f = fopen(filename, "rb");
+    if (!f)
+        return NULL;
+
+    fseek(f, 0, SEEK_END);
+    long size = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    Uint8 *buffer = (Uint8 *)malloc(size);
+    fread(buffer, size, 1, f);
+    fclose(f);
+
+    Uint16 w, h;
+    Uint8 *pixels = LoadGif(buffer, &w, &h);
+    if (pixels == NULL)
+    {
+        return NULL;
+    }
+    jSurface surf = (jSurface)malloc(sizeof(jSurface_s));
+    surf->w = w;
+    surf->h = h;
+    surf->data = pixels;
+    free(buffer);
+    return surf;
+}
+
+void jLoadPal(const char *filename)
+{
+    FILE *f = fopen(filename, "rb");
+    if (!f)
+        return;
+
+    fseek(f, 0, SEEK_END);
+    long size = ftell(f);
+    fseek(f, 0, SEEK_SET);
+    Uint8 *buffer = (Uint8 *)malloc(size);
+    fread(buffer, size, 1, f);
+    fclose(f);
+
+    Uint32 *pal = LoadPalette(buffer);
+    if (pal == NULL)
+    {
+        return;
+    }
+    free(buffer);
+    for (int i = 0; i < 256; ++i)
+    {
+        paleta[i] = pal[i];
+    }
+}
+
+void jInit(const char *titol, int w, int h, int z)
+{
+    SDL_Init(SDL_INIT_EVERYTHING);
+    jWidth = w;
+    jHeight = h;
+    jZoom = z;
+    jWin = SDL_CreateWindow(titol, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, w * z, h * z, SDL_WINDOW_SHOWN);
+    jRen = SDL_CreateRenderer(jWin, -1, 0);
+    SDL_RenderSetLogicalSize(jRen, w, h);
+    jTex = SDL_CreateTexture(jRen, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, w, h);
+    jScreen = jNewSurface(w, h);
+    jDestSurf = jScreen;
+}
+
+void jSetPal(int index, Uint32 color)
+{
+    paleta[index] = color;
+}
+
+void jCls(Uint8 color)
+{
+    for (int i = 0; i < jDestSurf->w * jDestSurf->h; ++i)
+        jDestSurf->data[i] = color;
+}
+
+void jFlip()
+{
+    Uint32 *pixels;
+    int pitch;
+    SDL_LockTexture(jTex, NULL, (void **)&pixels, &pitch);
+    for (int i = 0; i < jWidth * jHeight; ++i)
+        pixels[i] = paleta[jScreen->data[i]];
+    SDL_UnlockTexture(jTex);
+    SDL_RenderCopy(jRen, jTex, NULL, NULL);
+    SDL_RenderPresent(jRen);
+}
+
+void jPutPixel(int x, int y, Uint8 color)
+{
+    if (x < 0 || y < 0 || x >= jDestSurf->w || y >= jDestSurf->h)
+        return;
+    jDestSurf->data[x + y * jDestSurf->w] = color;
+}
+
+Uint8 jGetPixel(int x, int y)
+{
+    return jDestSurf->data[x + y * jDestSurf->w];
+}