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Adding nullpointer checks to GDISP image functions

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This commit is contained in:
Joel Bodenmann 2017-10-01 13:21:56 +02:00
parent 82047b1ac6
commit ea158a836d
3 changed files with 31 additions and 18 deletions
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1
changelog.txt
View file

@ -60,6 +60,7 @@ FEATURE: Added AHTML2COLOR() and ARGB2COLOR() to support alpha. This is currentl
FEATURE: Added the new color GFXTRANSPARENT - only available for RGB888 pixel format on alpha capable displays.
NOTE: Alpha support in RGB888 requies an alpha capable display (STM32LTDC 2nd display only currently)
NOTE: Alpha support in RGB888 is NOT the standard ARGB8888 format. Only use AHTML2COLOR() and ARGB2COLOR() to create alpha colors.
FEATURE: Added nullpointer checks to GDISP image functions (with new error code GDISP_IMAGE_ERR_NULLPOINTER)
*** Release 2.7 ***

17
src/gdisp/gdisp_image.c
View file

@ -110,6 +110,8 @@ void gdispImageInit(gdispImage *img) {
gdispImageError gdispImageOpenGFile(gdispImage *img, GFILE *f) {
gdispImageError err;
if (!img)
return GDISP_IMAGE_ERR_NULLPOINTER;
if (!f)
return GDISP_IMAGE_ERR_NOSUCHFILE;
img->f = f;
@ -141,6 +143,8 @@ unrecoverable:
}
void gdispImageClose(gdispImage *img) {
if (!img)
return;
if (img->fns)
img->fns->close(img);
gfileClose(img->f);
@ -151,19 +155,25 @@ void gdispImageClose(gdispImage *img) {
}
bool_t gdispImageIsOpen(gdispImage *img) {
if (!img)
return FALSE;
return img->type != GDISP_IMAGE_TYPE_UNKNOWN && img->fns != 0;
}
void gdispImageSetBgColor(gdispImage *img, color_t bgcolor) {
if (!img)
return;
img->bgcolor = bgcolor;
}
gdispImageError gdispImageCache(gdispImage *img) {
if (!img) return GDISP_IMAGE_ERR_NULLPOINTER;
if (!img->fns) return GDISP_IMAGE_ERR_BADFORMAT;
return img->fns->cache(img);
}
gdispImageError gdispGImageDraw(GDisplay *g, gdispImage *img, coord_t x, coord_t y, coord_t cx, coord_t cy, coord_t sx, coord_t sy) {
if (!img) return GDISP_IMAGE_ERR_NULLPOINTER;
if (!img->fns) return GDISP_IMAGE_ERR_BADFORMAT;
// Check on window
@ -179,24 +189,25 @@ gdispImageError gdispGImageDraw(GDisplay *g, gdispImage *img, coord_t x, coord_t
}
delaytime_t gdispImageNext(gdispImage *img) {
if (!img) return GDISP_IMAGE_ERR_NULLPOINTER;
if (!img->fns) return GDISP_IMAGE_ERR_BADFORMAT;
return img->fns->next(img);
}
uint16_t gdispImageGetPaletteSize(gdispImage *img) {
if (!img->fns) return 0;
if (!img || !img->fns) return 0;
if (!img->fns->getPaletteSize) return 0;
return img->fns->getPaletteSize(img);
}
color_t gdispImageGetPalette(gdispImage *img, uint16_t index) {
if (!img->fns) return 0;
if (!img || !img->fns) return 0;
if (!img->fns->getPalette) return 0;
return img->fns->getPalette(img, index);
}
bool_t gdispImageAdjustPalette(gdispImage *img, uint16_t index, color_t newColor) {
if (!img->fns) return FALSE;
if (!img || !img->fns) return FALSE;
if (!img->fns->adjustPalette) return FALSE;
return img->fns->adjustPalette(img, index, newColor);
}

31
src/gdisp/gdisp_image.h
View file

@ -43,6 +43,7 @@ typedef uint16_t gdispImageError;
#define GDISP_IMAGE_ERR_UNSUPPORTED_OK 3
#define GDISP_IMAGE_ERR_NOMEMORY (GDISP_IMAGE_ERR_UNRECOVERABLE+4)
#define GDISP_IMAGE_ERR_NOSUCHFILE (GDISP_IMAGE_ERR_UNRECOVERABLE+5)
#define GDISP_IMAGE_ERR_NULLPOINTER (GDISP_IMAGE_ERR_UNRECOVERABLE+6)
/**
* @brief Image flags
@ -68,7 +69,7 @@ typedef struct gdispImage {
const struct gdispImageHandlers * fns; /* @< Don't mess with this! */
void * priv; /* @< Don't mess with this! */
} gdispImage;
#ifdef __cplusplus
extern "C" {
#endif
@ -90,7 +91,7 @@ extern "C" {
* @param[in] f The open GFILE stream.
*
* @pre The GFILE must be open for reading.
*
*
* @note This determines which decoder to use and then initialises all other fields
* in the gdispImage structure.
* @note The image background color is set to White.
@ -152,9 +153,9 @@ extern "C" {
/**
* @brief Close an image and release any dynamically allocated working storage.
*
*
* @param[in] img The image structure
*
*
* @pre gdispImageOpenFile() must have returned successfully.
*
* @note Also calls the IO close function (if it hasn't already been called).
@ -186,7 +187,7 @@ extern "C" {
* continuing with drawing that includes transparency eg some GIF animations.
*/
void gdispImageSetBgColor(gdispImage *img, color_t bgcolor);
/**
* @brief Cache the image
* @details Decodes and caches the current frame into RAM.
@ -208,13 +209,13 @@ extern "C" {
/**
* @brief Draw the image
* @return GDISP_IMAGE_ERR_OK (0) on success or an error code.
*
*
* @param[in] g The display to draw on
* @param[in] img The image structure
* @param[in] x,y The screen location to draw the image
* @param[in] cx,cy The area on the screen to draw
* @param[in] sx,sy The image position to start drawing at
*
*
* @pre gdispImageOpen() must have returned successfully.
*
* @note If sx,sy + cx,cy is outside the image boundaries the area outside the image
@ -231,9 +232,9 @@ extern "C" {
* @brief Prepare for the next frame/page in the image file.
* @return A time in milliseconds to keep displaying the current frame before trying to draw
* the next frame. Watch out for the special values TIME_IMMEDIATE and TIME_INFINITE.
*
*
* @param[in] img The image structure
*
*
* @pre gdispImageOpen() must have returned successfully.
*
* @note It will return TIME_IMMEDIATE if the first frame/page hasn't been drawn or if the next frame
@ -253,24 +254,24 @@ extern "C" {
* @return The number of entries in the color palette or 0 if the image doesn't use a color palette.
*
* @param[in] img The image structure
*
*
* @pre gdispImageOpen() must have returned successfully.
*/
uint16_t gdispImageGetPaletteSize(gdispImage *img);
/**
* @brief Get an entry in the color palette.
* @return The color value at a given position in the color palette.
*
* @param[in] img The image structure
* @param[in] index The index of the color palette entry
*
*
* @pre gdispImageOpen() must have returned successfully.
*
* @note This function will return 0 if the index is out of bounds or if the image doesn't use a color palette.
*/
color_t gdispImageGetPalette(gdispImage *img, uint16_t index);
/**
* @brief Modify an entry in the color palette.
* @return @p TRUE on success, @p FALSE otherwise.
@ -278,12 +279,12 @@ extern "C" {
* @param[in] img The image structure
* @param[in] index The index of the color palette entry
* @param[in] newColor The new color value of the specified entry
*
*
* @pre gdispImageOpen() must have returned successfully.
* @note This function will return @p FALSE if the index is out of bounds or if the image doesn't use a color palette.
*/
bool_t gdispImageAdjustPalette(gdispImage *img, uint16_t index, color_t newColor);
#ifdef __cplusplus
}
#endif