Rename imv_image -> imv_loader to prepare for refactoring

1 files changed, 239 insertions, 0 deletions

diff --git a/src/loader.c b/src/loader.c
new file mode 100644
index 0000000..c9c5976
--- /dev/null
+++ b/src/loader.c
@@ -0,0 +1,239 @@
+/* Copyright (c) 2015 Harry Jeffery
+
+This program is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public License
+as published by the Free Software Foundation; either version 2
+of the License, or (at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+*/
+
+#include "loader.h"
+
+void imv_init_loader(struct imv_loader *ldr)
+{
+  ldr->mbmp = NULL;
+  ldr->cur_bmp = NULL;
+  ldr->width = 0;
+  ldr->height = 0;
+  ldr->cur_frame = 0;
+  ldr->next_frame = 0;
+  ldr->num_frames = 0;
+  ldr->frame_time = 0;
+  ldr->changed = 0;
+}
+
+void imv_destroy_loader(struct imv_loader *ldr)
+{
+  if(ldr->cur_bmp) {
+    FreeImage_Unload(ldr->cur_bmp);
+    ldr->cur_bmp = NULL;
+  }
+  if(ldr->mbmp) {
+    FreeImage_CloseMultiBitmap(ldr->mbmp, 0);
+    ldr->mbmp = NULL;
+  }
+}
+
+int imv_can_load_image(const char* path)
+{
+  if(FreeImage_GetFileType(path, 0) == FIF_UNKNOWN) {
+    return 0;
+  } else {
+    return 1;
+  }
+}
+
+int imv_loader_load(struct imv_loader *ldr, const char* path)
+{
+  if(ldr->mbmp) {
+    FreeImage_CloseMultiBitmap(ldr->mbmp, 0);
+    ldr->mbmp = NULL;
+  }
+
+  if(ldr->cur_bmp) {
+    FreeImage_Unload(ldr->cur_bmp);
+    ldr->cur_bmp = NULL;
+  }
+
+
+  FREE_IMAGE_FORMAT fmt = FreeImage_GetFileType(path,0);
+
+  if(fmt == FIF_UNKNOWN) {
+    return 1;
+  }
+
+  ldr->num_frames = 0;
+  ldr->cur_frame = 0;
+  ldr->next_frame = 0;
+  ldr->frame_time = 0;
+
+  if(fmt == FIF_GIF) {
+    ldr->mbmp = FreeImage_OpenMultiBitmap(FIF_GIF, path,
+      /* don't create file */ 0,
+      /* read only */ 1,
+      /* keep in memory */ 1,
+      /* flags */ GIF_LOAD256);
+    if(!ldr->mbmp) {
+      return 1;
+    }
+    ldr->num_frames = FreeImage_GetPageCount(ldr->mbmp);
+
+    /* get the dimensions from the first frame */
+    FIBITMAP *frame = FreeImage_LockPage(ldr->mbmp, 0);
+    ldr->width = FreeImage_GetWidth(frame);
+    ldr->height = FreeImage_GetHeight(frame);
+    if(!imv_loader_is_animated(ldr)) {
+      ldr->cur_bmp = FreeImage_ConvertTo32Bits(frame);
+    }
+    FreeImage_UnlockPage(ldr->mbmp, frame, 0);
+
+    if(imv_loader_is_animated(ldr)) {
+      /* load a frame */
+      imv_loader_load_next_frame(ldr);
+    }
+  } else {
+    FIBITMAP *image = FreeImage_Load(fmt, path, 0);
+    if(!image) {
+      return 1;
+    }
+    ldr->cur_bmp = FreeImage_ConvertTo32Bits(image);
+    ldr->width = FreeImage_GetWidth(ldr->cur_bmp);
+    ldr->height = FreeImage_GetHeight(ldr->cur_bmp);
+    FreeImage_Unload(image);
+  }
+
+  ldr->changed = 1;
+  return 0;
+}
+
+void imv_loader_load_next_frame(struct imv_loader *ldr)
+{
+  if(!imv_loader_is_animated(ldr)) {
+    return;
+  }
+
+  FITAG *tag = NULL;
+  char disposal_method = 0;
+  int frame_time = 0;
+  short top = 0;
+  short left = 0;
+
+  ldr->cur_frame = ldr->next_frame;
+  ldr->next_frame = (ldr->cur_frame + 1) % ldr->num_frames;
+  FIBITMAP *frame = FreeImage_LockPage(ldr->mbmp, ldr->cur_frame);
+  FIBITMAP *frame32 = FreeImage_ConvertTo32Bits(frame);
+
+  /* First frame is always going to use the raw frame */
+  if(ldr->cur_frame > 0) {
+    FreeImage_GetMetadata(FIMD_ANIMATION, frame, "DisposalMethod", &tag);
+    if(FreeImage_GetTagValue(tag)) {
+      disposal_method = *(char*)FreeImage_GetTagValue(tag);
+    }
+  }
+
+  FreeImage_GetMetadata(FIMD_ANIMATION, frame, "FrameLeft", &tag);
+  if(FreeImage_GetTagValue(tag)) {
+    left = *(short*)FreeImage_GetTagValue(tag);
+  }
+
+  FreeImage_GetMetadata(FIMD_ANIMATION, frame, "FrameTop", &tag);
+  if(FreeImage_GetTagValue(tag)) {
+    top = *(short*)FreeImage_GetTagValue(tag);
+  }
+
+  FreeImage_GetMetadata(FIMD_ANIMATION, frame, "FrameTime", &tag);
+  if(FreeImage_GetTagValue(tag)) {
+    frame_time = *(int*)FreeImage_GetTagValue(tag);
+  }
+
+  /* some gifs don't provide a frame time at all */
+  if(frame_time == 0) {
+    frame_time = 100;
+  }
+  ldr->frame_time += frame_time * 0.001;
+
+  FreeImage_UnlockPage(ldr->mbmp, frame, 0);
+
+  /* If this frame is inset, we need to expand it for compositing */
+  if(ldr->width != (int)FreeImage_GetWidth(frame32) ||
+     ldr->height != (int)FreeImage_GetHeight(frame32)) {
+    FIBITMAP *expanded = FreeImage_Allocate(ldr->width, ldr->height, 32, 0,0,0);
+    FreeImage_Paste(expanded, frame32, left, top, 255);
+    FreeImage_Unload(frame32);
+    frame32 = expanded;
+  }
+
+  switch(disposal_method) {
+    case 0: /* nothing specified, just use the raw frame */
+      if(ldr->cur_bmp) {
+        FreeImage_Unload(ldr->cur_bmp);
+      }
+      ldr->cur_bmp = frame32;
+      break;
+    case 1: /* composite over previous frame */
+      if(ldr->cur_bmp && ldr->cur_frame > 0) {
+        FIBITMAP *bg_frame = FreeImage_ConvertTo24Bits(ldr->cur_bmp);
+        FreeImage_Unload(ldr->cur_bmp);
+        FIBITMAP *comp = FreeImage_Composite(frame32, 1, NULL, bg_frame);
+        FreeImage_Unload(bg_frame);
+        FreeImage_Unload(frame32);
+        ldr->cur_bmp = comp;
+      } else {
+        /* No previous frame, just render directly */
+        if(ldr->cur_bmp) {
+          FreeImage_Unload(ldr->cur_bmp);
+        }
+        ldr->cur_bmp = frame32;
+      }
+      break;
+    case 2: /* TODO - set to background, composite over that */
+      if(ldr->cur_bmp) {
+        FreeImage_Unload(ldr->cur_bmp);
+      }
+      ldr->cur_bmp = frame32;
+      break;
+    case 3: /* TODO - restore to previous content */
+      if(ldr->cur_bmp) {
+        FreeImage_Unload(ldr->cur_bmp);
+      }
+      ldr->cur_bmp = frame32;
+      break;
+  }
+  ldr->changed = 1;
+}
+
+int imv_loader_is_animated(struct imv_loader *ldr)
+{
+  return ldr->num_frames > 1;
+}
+
+void imv_loader_play(struct imv_loader *ldr, double time)
+{
+  if(!imv_loader_is_animated(ldr)) {
+    return;
+  }
+
+  ldr->frame_time -= time;
+  if(ldr->frame_time < 0) {
+    ldr->frame_time = 0;
+    imv_loader_load_next_frame(ldr);
+  }
+}
+
+int imv_loader_has_changed(struct imv_loader *ldr)
+{
+  if(ldr->changed) {
+    ldr->changed = 0;
+    return 1;
+  } else {
+    return 0;
+  }
+}