mirror of
https://github.com/GRRLIB/GRRLIB.git
synced 2024-09-20 12:45:05 +00:00
[ADD] Added GRRLIB_FBReadPixel to read pixels directly from the FB.
[CHG] Optimized PNGU's YCbCr algorithm, allowing a full spectrum of RGB colors (0 - 255).
This commit is contained in:
Xane
parent
a9c6b7043f
commit
b120658463
3 changed files with 75 additions and 100 deletions
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@ -24,7 +24,6 @@ GXRModeObj *rmode;
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void *gp_fifo = NULL;
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static GRRLIB_drawSettings GRRLIB_Settings;
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static GRRLIB_linkedList *GRRLIB_ListImages;
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static void RawTo4x4RGBA(const unsigned char *src, void *dst, const unsigned int width, const unsigned int height);
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@ -315,7 +314,6 @@ GRRLIB_texImg GRRLIB_LoadTexturePNG(const unsigned char my_png[]) {
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my_texture.offsetx = 0; my_texture.offsety = 0;
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my_texture.tiledtex = false;
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GRRLIB_SetHandle( &my_texture, 0, 0 );
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GRRLIB_ListAddTexture( &my_texture );
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GRRLIB_FlushTex( my_texture );
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return my_texture;
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}
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@ -377,7 +375,6 @@ GRRLIB_texImg GRRLIB_LoadTextureJPG(const unsigned char my_jpg[]) {
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my_texture.offsetx = 0; my_texture.offsety = 0;
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my_texture.tiledtex = false;
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GRRLIB_SetHandle( &my_texture, 0, 0 );
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GRRLIB_ListAddTexture( &my_texture );
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GRRLIB_FlushTex(my_texture);
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return my_texture;
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}
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@ -1192,7 +1189,6 @@ void GRRLIB_Init() {
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// Default settings
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GRRLIB_Settings.antialias = true;
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GRRLIB_ListImages = NULL;
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}
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/**
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@ -1254,65 +1250,59 @@ bool GRRLIB_ScrShot(const char* File) {
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/**
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* Add a GRRLIB texture into the list.
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* @param img The texture to add.
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* Reads a pixel directly from the FrontBuffer.
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* Since the FB is stored in YCbCr,
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* @param x The x-coordinate within the FB.
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* @param y The y-coordinate within the FB.
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* @param R1 A pointer to a variable receiving the first Red value.
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* @param G1 A pointer to a variable receiving the first Green value.
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* @param B1 A pointer to a variable receiving the first Blue value.
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* @param R2 A pointer to a variable receiving the second Red value.
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* @param G2 A pointer to a variable receiving the second Green value.
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* @param B2 A pointer to a variable receiving the second Blue value.
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*/
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void GRRLIB_ListAddTexture( struct GRRLIB_texImg *img ) {
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GRRLIB_linkedList *temp = malloc(sizeof(GRRLIB_linkedList));
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if (temp == NULL) { return; }
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void GRRLIB_FBReadPixel(int x, int y, u8 *R1, u8 *G1, u8 *B1, u8* R2, u8 *G2, u8 *B2 ) {
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// Position Correction
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if (x > rmode->fbWidth) { x = rmode->fbWidth; }
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if (x < 0) { x = 0; }
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if (y > rmode->efbHeight) { y = rmode->efbHeight; }
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if (y < 0) { y = 0; }
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x = x / 2; /* FB is storing 2 pixels at once (YCbCr),
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so we just need half of the width. */
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temp->next = *&GRRLIB_ListImages;
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temp->texture = img;
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temp->Num = 1337;
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*&GRRLIB_ListImages = temp;
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// Preparing FB for reading
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u32 Buffer = (((u32 *)xfb[fb])[y*(rmode->fbWidth/2)+x]);
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u8 *Colors = (u8 *) &Buffer;
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/** Color channel:
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Colors[0] = Y1
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Colors[1] = Cb
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Colors[2] = Y2
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Colors[3] = Cr */
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*R1 = GRRLIB_FBClamp( 1.164 * (Colors[0] - 16) + 1.596 * (Colors[3] - 128) );
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*G1 = GRRLIB_FBClamp( 1.164 * (Colors[0] - 16) - 0.813 * (Colors[3] - 128) - 0.392 * (Colors[1] - 128) );
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*B1 = GRRLIB_FBClamp( 1.164 * (Colors[0] - 16) + 2.017 * (Colors[1] - 128) );
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*R2 = GRRLIB_FBClamp( 1.164 * (Colors[2] - 16) + 1.596 * (Colors[3] - 128) );
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*G2 = GRRLIB_FBClamp( 1.164 * (Colors[2] - 16) - 0.813 * (Colors[3] - 128) - 0.392 * (Colors[1] - 128) );
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*B2 = GRRLIB_FBClamp( 1.164 * (Colors[2] - 16) + 2.017 * (Colors[1] - 128) );
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}
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/**
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* Delete an list entry containing the pointer of a texture.
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* @param img The texture to delete.
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* A helper function for the YCbCr -> RGB conversion.
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* Clamps the given value into a range of 0 - 255 and thus preventing an overflow.
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* @param The value to clamp.
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* @return Returns a clean, clamped unsigned char.
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*/
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int GRRLIB_ListDelTexture( struct GRRLIB_texImg *img ) {
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GRRLIB_linkedList *temp = GRRLIB_ListImages;
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if (!temp) { return false; } // List is empty.
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while ( temp->next ) {
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if (temp->texture == img) { // <- Doesn't really work, need to find another way. :x
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return 1337;
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//free(img->data);
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//free(img);
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//GRRLIB_ListRemove( &temp );
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//return true;
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u8 GRRLIB_FBClamp (float Value) {
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/* Using float to increase the precision.
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This makes a full spectrum (0 - 255) possible. */
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Value = roundf(Value);
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if (Value < 0) {
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Value = 0;
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} else if (Value > 255) {
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Value = 255;
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}
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temp = temp->next;
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}
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return false;
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}
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/**
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* Removes an entry of an Array List.
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* @param list The pointer to a list.
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*/
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void GRRLIB_ListRemove( struct GRRLIB_linkedList **list ) {
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if (list) {
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GRRLIB_linkedList *temp = *list;
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*list = (*list)->next;
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free(temp);
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}
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}
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/**
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* Just for testing purposes.
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* Loops through all members of an Array List and returns the member count.
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*/
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unsigned int GRRLIB_ListGetTextureEntries() {
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unsigned int cnt = 0;
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GRRLIB_linkedList *temp = GRRLIB_ListImages;
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if (!temp) { return 0; } // List is empty.
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while ( temp->next ) {
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cnt = cnt + 1;
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temp = temp->next;
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}
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return cnt;
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return (u8)Value;
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}
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@ -84,15 +84,6 @@ typedef struct GRRLIB_bytemapFont {
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GRRLIB_bytemapChar *charDef; /**< List of bitmap character definitions. */
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} GRRLIB_bytemapFont;
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/**
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* Linked List to inherit all members of an GRRLIB struct.
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*/
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typedef struct GRRLIB_linkedList {
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GRRLIB_texImg *texture; /**< GRRLIB Texture. */
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int Num;
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struct GRRLIB_linkedList *next; /**< Pointer to next LinkedList. */
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} GRRLIB_linkedList;
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extern Mtx GXmodelView2D;
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@ -166,11 +157,8 @@ void GRRLIB_Exit();
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bool GRRLIB_ScrShot(const char*);
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void GRRLIB_ListAddTexture( struct GRRLIB_texImg *img );
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int GRRLIB_ListDelTexture( struct GRRLIB_texImg *img );
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void GRRLIB_ListRemove( struct GRRLIB_linkedList **list );
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unsigned int GRRLIB_ListGetTextureEntries();
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void GRRLIB_FBReadPixel(int x, int y, u8 *R1, u8 *G1, u8 *B1, u8* R2, u8 *G2, u8 *B2 );
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u8 GRRLIB_FBClamp (float Value);
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#ifdef __cplusplus
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}
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@ -1,14 +1,16 @@
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/********************************************************************************************
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PNGU Version : 0.2a
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PNGU Version : 0.2b
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Coder : frontier
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YCbCr fix by Xane
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More info : http://frontier-dev.net
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********************************************************************************************/
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#include <stdio.h>
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#include <malloc.h>
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#include <math.h>
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#include "pngu.h"
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#include "../png.h"
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@ -25,7 +27,7 @@ void pngu_free_info (IMGCTX ctx);
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void pngu_read_data_from_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
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void pngu_write_data_to_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
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void pngu_flush_data_to_buffer (png_structp png_ptr);
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int pngu_clamp (int value, int min, int max);
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int pngu_clamp (float value);
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// PNGU Image context struct
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@ -818,20 +820,15 @@ PNGU_u32 PNGU_RGB8_TO_YCbYCr (PNGU_u8 r1, PNGU_u8 g1, PNGU_u8 b1, PNGU_u8 r2, PN
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void PNGU_YCbYCr_TO_RGB8 (PNGU_u32 ycbycr, PNGU_u8 *r1, PNGU_u8 *g1, PNGU_u8 *b1, PNGU_u8 *r2, PNGU_u8 *g2, PNGU_u8 *b2)
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{
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PNGU_u8 *val = (PNGU_u8 *) &ycbycr;
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int r, g, b;
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PNGU_u8 *Colors = (PNGU_u8 *) &ycbycr;
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r = 1.371f * (val[3] - 128);
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g = - 0.698f * (val[3] - 128) - 0.336f * (val[1] - 128);
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b = 1.732f * (val[1] - 128);
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*r1 = pngu_clamp( 1.164 * (Colors[0] - 16) + 1.596 * (Colors[3] - 128) );
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*g1 = pngu_clamp( 1.164 * (Colors[0] - 16) - 0.813 * (Colors[3] - 128) - 0.392 * (Colors[1] - 128) );
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*b1 = pngu_clamp( 1.164 * (Colors[0] - 16) + 2.017 * (Colors[1] - 128) );
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*r1 = pngu_clamp (val[0] + r, 0, 255);
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*g1 = pngu_clamp (val[0] + g, 0, 255);
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*b1 = pngu_clamp (val[0] + b, 0, 255);
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*r2 = pngu_clamp (val[2] + r, 0, 255);
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*g2 = pngu_clamp (val[2] + g, 0, 255);
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*b2 = pngu_clamp (val[2] + b, 0, 255);
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*r2 = pngu_clamp( 1.164 * (Colors[2] - 16) + 1.596 * (Colors[3] - 128) );
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*g2 = pngu_clamp( 1.164 * (Colors[2] - 16) - 0.813 * (Colors[3] - 128) - 0.392 * (Colors[1] - 128) );
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*b2 = pngu_clamp( 1.164 * (Colors[2] - 16) + 2.017 * (Colors[1] - 128) );
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}
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@ -1120,13 +1117,13 @@ void pngu_flush_data_to_buffer (png_structp png_ptr)
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// Function used in YCbYCr to RGB decoding
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int pngu_clamp (int value, int min, int max)
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{
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if (value < min)
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value = min;
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else if (value > max)
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value = max;
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return value;
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int pngu_clamp(float Value) {
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Value = roundf(Value);
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if (Value < 0) {
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Value = 0;
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} else if (Value > 255) {
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Value = 255;
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}
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return (int)Value;
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}
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