mirror of
https://github.com/GRRLIB/GRRLIB.git
synced 2024-12-22 18:39:18 +00:00
Made the code in pngu.c easier to read
By adding some curly brackets and reducing some variable scopes.
This commit is contained in:
Crayon2000
parent
ec76ad184f
commit
bb8d8ed569
2 changed files with 68 additions and 54 deletions
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@ -32,7 +32,7 @@ THE SOFTWARE.
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* @return A GRRLIB_bytemapFont structure filled with BMF information.
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* @see GRRLIB_FreeBMF
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*/
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GRRLIB_bytemapFont* GRRLIB_LoadBMF (const u8 my_bmf[] ) {
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GRRLIB_bytemapFont* GRRLIB_LoadBMF (const u8 my_bmf[]) {
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GRRLIB_bytemapFont *fontArray = (struct GRRLIB_bytemapFont *)malloc(sizeof(GRRLIB_bytemapFont));
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if (fontArray != NULL && my_bmf[0]==0xE1 && my_bmf[1]==0xE6 && my_bmf[2]==0xD5 && my_bmf[3]==0x1A) {
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@ -58,12 +58,10 @@ struct _IMGCTX
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IMGCTX PNGU_SelectImageFromBuffer (const void *buffer)
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{
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IMGCTX ctx = NULL;
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if (!buffer)
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return NULL;
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ctx = malloc (sizeof (struct _IMGCTX));
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IMGCTX ctx = malloc (sizeof (struct _IMGCTX));
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if (!ctx)
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return NULL;
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@ -80,12 +78,10 @@ IMGCTX PNGU_SelectImageFromBuffer (const void *buffer)
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IMGCTX PNGU_SelectImageFromDevice (const char *filename)
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{
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IMGCTX ctx = NULL;
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if (!filename)
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return NULL;
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ctx = malloc (sizeof (struct _IMGCTX));
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IMGCTX ctx = malloc (sizeof (struct _IMGCTX));
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if (!ctx)
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return NULL;
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@ -142,9 +138,6 @@ int PNGU_GetImageProperties (IMGCTX ctx, PNGUPROP *imgprop)
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int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
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{
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int result;
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PNGU_u32 x, y;
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// width needs to be divisible by two
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if (width % 2)
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return PNGU_ODD_WIDTH;
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@ -153,16 +146,20 @@ int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buff
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if (stride % 2)
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return PNGU_ODD_STRIDE;
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result = pngu_decode (ctx, width, height, 1);
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const int result = pngu_decode (ctx, width, height, 1);
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if (result != PNGU_OK)
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return result;
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// Copy image to the output buffer
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const PNGU_u32 buffWidth = (width + stride) / 2;
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for (y = 0; y < height; y++)
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for (x = 0; x < (width / 2); x++)
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for (PNGU_u32 y = 0; y < height; y++)
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{
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for (PNGU_u32 x = 0; x < (width / 2); x++)
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{
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((PNGU_u32 *)buffer)[y*buffWidth+x] = PNGU_RGB8_TO_YCbYCr (*(ctx->row_pointers[y]+x*6), *(ctx->row_pointers[y]+x*6+1), *(ctx->row_pointers[y]+x*6+2),
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*(ctx->row_pointers[y]+x*6+3), *(ctx->row_pointers[y]+x*6+4), *(ctx->row_pointers[y]+x*6+5));
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}
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}
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// Free resources
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free (ctx->img_data);
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@ -175,22 +172,23 @@ int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buff
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int PNGU_DecodeToRGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
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{
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int result;
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PNGU_u32 x, y;
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result = pngu_decode (ctx, width, height, 1);
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const int result = pngu_decode (ctx, width, height, 1);
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if (result != PNGU_OK)
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return result;
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const PNGU_u32 buffWidth = width + stride;
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// Copy image to the output buffer
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for (y = 0; y < height; y++)
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for (x = 0; x < width; x++)
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for (PNGU_u32 y = 0; y < height; y++)
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{
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for (PNGU_u32 x = 0; x < width; x++)
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{
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((PNGU_u16 *)buffer)[y*buffWidth+x] =
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(((PNGU_u16) (ctx->row_pointers[y][x*3] & 0xF8)) << 8) |
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(((PNGU_u16) (ctx->row_pointers[y][x*3+1] & 0xFC)) << 3) |
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(((PNGU_u16) (ctx->row_pointers[y][x*3+2] & 0xF8)) >> 3);
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}
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}
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// Free resources
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free (ctx->img_data);
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@ -203,10 +201,7 @@ int PNGU_DecodeToRGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buff
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int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride, PNGU_u8 default_alpha)
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{
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int result;
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PNGU_u32 x, y;
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result = pngu_decode (ctx, width, height, 0);
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const int result = pngu_decode (ctx, width, height, 0);
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if (result != PNGU_OK)
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return result;
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@ -216,19 +211,25 @@ int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffe
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if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
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{
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// Alpha channel present, copy image to the output buffer
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for (y = 0; y < height; y++)
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for (PNGU_u32 y = 0; y < height; y++)
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{
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memcpy (buffer + (y * buffWidth * 4), ctx->row_pointers[y], width * 4);
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}
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}
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else
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{
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// No alpha channel present, copy image to the output buffer
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for (y = 0; y < height; y++)
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for (x = 0; x < width; x++)
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for (PNGU_u32 y = 0; y < height; y++)
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{
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for (PNGU_u32 x = 0; x < width; x++)
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{
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((PNGU_u32 *)buffer)[y*buffWidth+x] =
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(((PNGU_u32) ctx->row_pointers[y][x*3]) << 24) |
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(((PNGU_u32) ctx->row_pointers[y][x*3+1]) << 16) |
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(((PNGU_u32) ctx->row_pointers[y][x*3+2]) << 8) |
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((PNGU_u32) default_alpha);
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}
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}
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}
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// Free resources
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@ -242,14 +243,11 @@ int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffe
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int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer)
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{
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int result;
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PNGU_u32 x, y;
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// width and height need to be divisible by four
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if ((width % 4) || (height % 4))
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return PNGU_INVALID_WIDTH_OR_HEIGHT;
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result = pngu_decode (ctx, width, height, 1);
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const int result = pngu_decode (ctx, width, height, 1);
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if (result != PNGU_OK)
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return result;
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@ -257,10 +255,11 @@ int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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const PNGU_u32 qwidth = width / 4;
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const PNGU_u32 qheight = height / 4;
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for (y = 0; y < qheight; y++)
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for (x = 0; x < qwidth; x++)
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for (PNGU_u32 y = 0; y < qheight; y++)
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{
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for (PNGU_u32 x = 0; x < qwidth; x++)
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{
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int blockbase = (y * qwidth + x) * 4;
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const int blockbase = (y * qwidth + x) * 4;
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PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
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PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
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@ -294,6 +293,7 @@ int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
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(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
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}
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}
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// Free resources
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free (ctx->img_data);
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@ -306,14 +306,11 @@ int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha)
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{
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int result;
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PNGU_u32 x, y;
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// width and height need to be divisible by four
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if ((width % 4) || (height % 4))
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return PNGU_INVALID_WIDTH_OR_HEIGHT;
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result = pngu_decode (ctx, width, height, 0);
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const int result = pngu_decode (ctx, width, height, 0);
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if (result != PNGU_OK)
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return result;
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@ -325,8 +322,9 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
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{
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// Alpha channel present, copy image to the output buffer
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for (y = 0; y < qheight; y++)
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for (x = 0; x < qwidth; x++)
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for (PNGU_u32 y = 0; y < qheight; y++)
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{
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for (PNGU_u32 x = 0; x < qwidth; x++)
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{
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int blockbase = (y * qwidth + x) * 4;
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PNGU_u64 tmp;
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@ -451,6 +449,7 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
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((PNGU_u64 *) buffer)[blockbase+3] = tmp;
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}
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}
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}
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else
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{
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@ -463,8 +462,9 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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// The user wants an opaque texture, so set MSB to 1 and encode colors in RGB555
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alphaMask = 0x8000800080008000ULL;
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for (y = 0; y < qheight; y++)
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for (x = 0; x < qwidth; x++)
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for (PNGU_u32 y = 0; y < qheight; y++)
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{
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for (PNGU_u32 x = 0; x < qwidth; x++)
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{
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int blockbase = (y * qwidth + x) * 4;
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@ -500,6 +500,7 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) |
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((field32 & 0xF8000000ULL) >> 11) | ((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
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}
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}
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}
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else
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{
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@ -508,8 +509,9 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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alphaMask = (((PNGU_u64) default_alpha) << 56) | (((PNGU_u64) default_alpha) << 40) |
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(((PNGU_u64) default_alpha) << 24) | (((PNGU_u64) default_alpha) << 8);
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for (y = 0; y < qheight; y++)
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for (x = 0; x < qwidth; x++)
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for (PNGU_u32 y = 0; y < qheight; y++)
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{
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for (PNGU_u32 x = 0; x < qwidth; x++)
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{
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int blockbase = (y * qwidth + x) * 4;
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@ -545,6 +547,7 @@ int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *b
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((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |
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((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
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}
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}
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}
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}
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@ -577,7 +580,7 @@ PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, in
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if(width > 1024 || height > 1024)
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{
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float ratio = (float)width/(float)height;
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const float ratio = (float)width/(float)height;
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if(ratio > 1)
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{
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@ -621,7 +624,7 @@ PNGU_u8 * PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, in
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}
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else
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{
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png_byte *pixel;
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const png_byte *pixel;
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if(xRatio > 0)
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{
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x2 = ((x*xRatio)>>16);
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@ -988,12 +991,12 @@ int pngu_info (IMGCTX ctx)
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png_color_16p background;
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png_bytep trans;
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png_color_16p trans_values;
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int i;
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// Check if there is a file selected and if it is a valid .png
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if (ctx->source == PNGU_SOURCE_BUFFER)
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{
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memcpy (magic, ctx->buffer, 8);
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}
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else if (ctx->source == PNGU_SOURCE_DEVICE)
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{
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// Open file
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@ -1007,9 +1010,10 @@ int pngu_info (IMGCTX ctx)
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return PNGU_CANT_READ_FILE;
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}
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}
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else
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{
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return PNGU_NO_FILE_SELECTED;
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}
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if (png_sig_cmp(magic, 0, 8) != 0)
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{
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@ -1085,9 +1089,7 @@ int pngu_info (IMGCTX ctx)
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}
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// Constant used to scale 16 bit values to 8 bit values
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int scale = 1;
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if (ctx->prop.imgBitDepth == 16)
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scale = 256;
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const int scale = (ctx->prop.imgBitDepth == 16) ? 256 : 1;
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// Query background color, if any.
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ctx->prop.validBckgrnd = 0;
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@ -1116,14 +1118,18 @@ int pngu_info (IMGCTX ctx)
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{
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ctx->prop.trans = malloc (sizeof (PNGUCOLOR) * ctx->prop.numTrans);
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if (ctx->prop.trans)
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for (i = 0; i < ctx->prop.numTrans; i++)
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{
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for (int i = 0; i < ctx->prop.numTrans; i++)
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{
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ctx->prop.trans[i].r = trans_values[i].red / scale;
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ctx->prop.trans[i].g = trans_values[i].green / scale;
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ctx->prop.trans[i].b = trans_values[i].blue / scale;
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}
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}
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else
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{
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ctx->prop.numTrans = 0;
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}
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}
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}
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else if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)) &&
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@ -1133,11 +1139,17 @@ int pngu_info (IMGCTX ctx)
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{
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ctx->prop.trans = malloc (sizeof (PNGUCOLOR) * ctx->prop.numTrans);
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if (ctx->prop.trans)
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for (i = 0; i < ctx->prop.numTrans; i++)
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{
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for (int i = 0; i < ctx->prop.numTrans; i++)
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{
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ctx->prop.trans[i].r = ctx->prop.trans[i].g = ctx->prop.trans[i].b =
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trans_values[i].gray / scale;
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trans_values[i].gray / scale;
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}
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}
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else
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{
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ctx->prop.numTrans = 0;
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}
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}
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}
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@ -1212,7 +1224,9 @@ int pngu_decode (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stripAlph
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}
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for (i = 0; i < ctx->prop.imgHeight; i++)
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{
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ctx->row_pointers[i] = ctx->img_data + (i * rowbytes);
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}
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// Transform the image and copy it to our allocated memory
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png_read_image (ctx->png_ptr, ctx->row_pointers);
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