185 static int tick_type(png_bytep p, bool transparent, const char** outError)  in tick_type()  argument
202 …          *outError = "Frame pixels must be either solid or transparent (not intermediate alphas)";  in tick_type()
206             *outError = "Ticks in transparent frame must be black or red";  in tick_type()
212         *outError = "White frame must be a solid color (no alpha)";  in tick_type()
225         *outError = "Ticks in white frame must be black or red";  in tick_type()
239         int32_t* outLeft, int32_t* outRight, const char** outError,  in get_horizontal_ticks()  argument
248         if (TICK_TYPE_TICK == tick_type(row+i*4, transparent, outError)) {  in get_horizontal_ticks()
259                 *outError = "Can't have more than one marked region along edge";  in get_horizontal_ticks()
263         } else if (*outError == NULL) {  in get_horizontal_ticks()
278         *outError = "No marked region found along edge";  in get_horizontal_ticks()
288         int32_t* outTop, int32_t* outBottom, const char** outError,  in get_vertical_ticks()  argument
297         if (TICK_TYPE_TICK == tick_type(rows[i]+offset, transparent, outError)) {  in get_vertical_ticks()
308                 *outError = "Can't have more than one marked region along edge";  in get_vertical_ticks()
312         } else if (*outError == NULL) {  in get_vertical_ticks()
327         *outError = "No marked region found along edge";  in get_vertical_ticks()
337         int32_t* outLeft, int32_t* outRight, const char** outError)  in get_horizontal_layout_bounds_ticks()  argument
343     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + 4, transparent, outError)) {  in get_horizontal_layout_bounds_ticks()
349             int tick = tick_type(row + i * 4, transparent, outError);  in get_horizontal_layout_bounds_ticks()
357     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(row + (width - 2) * 4, transparent, outError)) {  in get_horizontal_layout_bounds_ticks()
363             int tick = tick_type(row+i*4, transparent, outError);  in get_horizontal_layout_bounds_ticks()
375         int32_t* outTop, int32_t* outBottom, const char** outError)  in get_vertical_layout_bounds_ticks()  argument
381     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[1] + offset, transparent, outError)) {  in get_vertical_layout_bounds_ticks()
387             int tick = tick_type(rows[i] + offset, transparent, outError);  in get_vertical_layout_bounds_ticks()
395     if (TICK_TYPE_LAYOUT_BOUNDS == tick_type(rows[height - 2] + offset, transparent, outError)) {  in get_vertical_layout_bounds_ticks()
401             int tick = tick_type(rows[i] + offset, transparent, outError);  in get_vertical_layout_bounds_ticks()