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Fix dereferencing NULL if image fails to load

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If LoadImage() returned NULL, the game would dereference it and
segfault. So I've added NULL checks to dereferencing the pointers.
This commit is contained in:
Misa 2021-04-18 10:57:48 -07:00 committed by Ethan Lee
parent 8956b04d67
commit 9f11438dcc
1 changed files with 26 additions and 17 deletions
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43
desktop_version/src/Graphics.cpp
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@ -306,15 +306,19 @@ void Graphics::updatetitlecolours(void)
} }
#define PROCESS_TILESHEET_CHECK_ERROR(tilesheet, tile_square) \ #define PROCESS_TILESHEET_CHECK_ERROR(tilesheet, tile_square) \
if (grphx.im_##tilesheet->w % tile_square != 0 \ if (grphx.im_##tilesheet == NULL) \
{ \
/* We have already asserted; just no-op. */ \
} \
else if (grphx.im_##tilesheet->w % tile_square != 0 \
|| grphx.im_##tilesheet->h % tile_square != 0) \ || grphx.im_##tilesheet->h % tile_square != 0) \
{ \ { \
const char* error = "Error: %s.png dimensions not exact multiples of %i!"; \ const char* error = "Error: %s.png dimensions not exact multiples of %i!"; \
char message[128]; \ char message[128]; \
SDL_snprintf(message, sizeof(message), error, #tilesheet, tile_square); \
\
const char* error_title = "Error with %s.png"; \ const char* error_title = "Error with %s.png"; \
char message_title[128]; \ char message_title[128]; \
\
SDL_snprintf(message, sizeof(message), error, #tilesheet, tile_square); \
SDL_snprintf(message_title, sizeof(message_title), error_title, #tilesheet); \ SDL_snprintf(message_title, sizeof(message_title), error_title, #tilesheet); \
\ \
puts(message); \ puts(message); \
@ -332,23 +336,28 @@ void Graphics::updatetitlecolours(void)
#define PROCESS_TILESHEET_RENAME(tilesheet, vector, tile_square, extra_code) \ #define PROCESS_TILESHEET_RENAME(tilesheet, vector, tile_square, extra_code) \
PROCESS_TILESHEET_CHECK_ERROR(tilesheet, tile_square) \ PROCESS_TILESHEET_CHECK_ERROR(tilesheet, tile_square) \
\ \
for (int j = 0; j < grphx.im_##tilesheet->h / tile_square; j++) \ else \
{ \ { \
for (int i = 0; i < grphx.im_##tilesheet->w / tile_square; i++) \ int j; \
for (j = 0; j < grphx.im_##tilesheet->h / tile_square; ++j) \
{ \ { \
SDL_Surface* temp = GetSubSurface( \ int i; \
grphx.im_##tilesheet, \ for (i = 0; i < grphx.im_##tilesheet->w / tile_square; ++i) \
i * tile_square, j * tile_square, \ { \
tile_square, tile_square \ SDL_Surface* temp = GetSubSurface( \
); \ grphx.im_##tilesheet, \
vector.push_back(temp); \ i * tile_square, j * tile_square, \
\ tile_square, tile_square \
extra_code \ ); \
vector.push_back(temp); \
\
extra_code \
} \
} \ } \
} \ \
\ SDL_FreeSurface(grphx.im_##tilesheet); \
SDL_FreeSurface(grphx.im_##tilesheet); \ grphx.im_##tilesheet = NULL; \
grphx.im_##tilesheet = NULL; }
#define PROCESS_TILESHEET(tilesheet, tile_square, extra_code) \ #define PROCESS_TILESHEET(tilesheet, tile_square, extra_code) \
PROCESS_TILESHEET_RENAME(tilesheet, tilesheet, tile_square, extra_code) PROCESS_TILESHEET_RENAME(tilesheet, tilesheet, tile_square, extra_code)