mehmet gok
Fork of Silabs MemoryLCD library
Dependents: demoUI whrmDemoUI Host_Software_MAX32664GWEB_HR_EXTENDED Host_Software_MAX32664GWEC_SpO2_HR-_EXTE ... more
C++ library for Sharp Microelectronics 1.28 inch LCD TFT, LS013B7DH03, SPI bus. Forked from Silicon Labs MemoryLCD display driver.
Revision 10:231fa7861d1f, committed 2015-08-12
- Comitter:
- stevew817
- Date:
- Wed Aug 12 13:32:01 2015 +0000
- Parent:
- 9:2441ef131ab8
- Child:
- 11:0f8ae10b308d
- Commit message:
- Use masking instead of modulo to speed up operation of pixel()
Changed in this revision
| BufferedDisplay.cpp | Show annotated file Show diff for this revision Revisions of this file |
| LCDSettings.h | Show annotated file Show diff for this revision Revisions of this file |
--- a/BufferedDisplay.cpp Thu Jul 30 09:01:02 2015 +0000
+++ b/BufferedDisplay.cpp Wed Aug 12 13:32:01 2015 +0000
@@ -82,13 +82,13 @@
/* Since we are dealing with 1-bit pixels, we can avoid having to do bitshift and comparison operations twice.
* Basically, do the comparison with the requested state and current state, and if it changed, do an XOR on the framebuffer pixel and set the line to dirty.
*/
- bool change = ((_pixelBuffer[((y * DISPLAY_WIDTH) + x) / DISPLAY_BUFFER_TYPE_SIZE] & (1 << (x % DISPLAY_BUFFER_TYPE_SIZE))) != ((colour & 0x01) << (x % DISPLAY_BUFFER_TYPE_SIZE)));
+ bool change = ((_pixelBuffer[((y * DISPLAY_WIDTH) + x) / DISPLAY_BUFFER_TYPE_SIZE] & (1 << (x & DISPLAY_BUFFER_TYPE_MASK))) != ((colour & 0x01) << (x & DISPLAY_BUFFER_TYPE_MASK)));
if(change) {
- /* Do XOR (no bitshifting required) */
- _pixelBuffer[((y * DISPLAY_WIDTH) + x) / DISPLAY_BUFFER_TYPE_SIZE] ^= (1 << (x % DISPLAY_BUFFER_TYPE_SIZE));
+ /* Pixel's value and requested value are different, so since it's binary, we can simply do an XOR */
+ _pixelBuffer[((y * DISPLAY_WIDTH) + x) / DISPLAY_BUFFER_TYPE_SIZE] ^= (1 << (x & DISPLAY_BUFFER_TYPE_MASK));
/* notify dirty status of this line */
- _dirtyRows[y / DISPLAY_BUFFER_TYPE_SIZE] |= (1 << (y % DISPLAY_BUFFER_TYPE_SIZE));
+ _dirtyRows[y / DISPLAY_BUFFER_TYPE_SIZE] |= (1 << (y & DISPLAY_BUFFER_TYPE_MASK));
}
}
--- a/LCDSettings.h Thu Jul 30 09:01:02 2015 +0000 +++ b/LCDSettings.h Wed Aug 12 13:32:01 2015 +0000 @@ -10,8 +10,10 @@ /** Data type for storing buffer the pixel buffer */ #if ((DISPLAY_WIDTH % 32) == 0) #define DISPLAY_BUFFER_TYPE uint32_t +#define DISPLAY_BUFFER_TYPE_MASK (0x1F) #else #define DISPLAY_BUFFER_TYPE uint8_t +#define DISPLAY_BUFFER_TYPE_MASK (0x07) #endif #define DISPLAY_BUFFER_TYPE_SIZE (sizeof(DISPLAY_BUFFER_TYPE) * 8)